CuriousMarc
Modern Tech Fail : HP w2207h Display Has Capacitor Plague
updated
Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
ibiblio.org/apollo/Documents/HSI-481260.pdf
Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
The launch of Explorer 1 (NASA documentary): youtube.com/watch?v=NfMIrKkzRx8
Biography of a Missile (CBS documentary on Explorer 7X ending with Juno II failure): youtube.com/watch?v=o8T8UPtw9l0&t=3155s
First Atlas launch: youtube.com/watch?v=q_ksxx_qXNc
NASA 1963 Gemini Documentary "All Systems Go": youtube.com/watch?v=9AokEeaSGwY
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
ibiblio.org/apollo/Documents/HSI-481260.pdf
Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
HP 7044B and 7045B Service Manual: archive.org/details/hp-7044-b-7045-b-x-y-recorder-operations-and-service-manual-07044-90006-nov.-1980
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Intro, previous HP 7035B restoration
01:06 Inspection and first try
02:42 Disassembly, slide cleaning and platen repair
06:44 A power supply fault?
08:44 X-axis fix
09:30 Y power supply debug and fix
13:07 Y-axis still fails!
13:42 Servo circuits (with elevator music)
18:18 Y servo circuit debug
21:01 It self heals, then self breaks!
22:10 Bad op-amp?
24:55 Root cause, repair, and calibration
28:28 Restoring the pens
32:24 It breaks again!
34:02 Second repair
37:59 Laser L-I curve plot demo
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
ibiblio.org/apollo/Documents/HSI-481260.pdf
Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Many thanks to Hirox: hirox-usa.com
Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
ibiblio.org/apollo/Documents/HSI-481260.pdf
Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Get a PiDP-10: obsolescence.wixsite.com/obsolescence/pidp-10-get-one
Get Steven Levy's Hackers book: amzn.to/4bIVz5w
PiDP-10: obsolescence.wixsite.com/obsolescence/pidp10
PiDP-8: obsolescence.wixsite.com/obsolescence/pidp-8
PiDP-11: obsolescence.wixsite.com/obsolescence/pidp-11
Oscar's website: obsolescence.wixsite.com/obsolescence
ITS reconstruction project: https://obsolescence.dev/its.html
Lars Brinkhoff ITS GitHub: github.com/PDP-10/its
PDP-1 video: youtu.be/1EWQYAfuMYw
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Older video on Fractional-N PLLs, used for frequency synthesis: youtube.com/watch?v=z-50pSc_wg8
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
ibiblio.org/apollo/Documents/HSI-481260.pdf
Stuff that supports the channel:
- Support us on Patreon: patreon.com/curiousmarc
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Contact info: youtube.com/curiousmarc/about
Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Many thanks to HP enthusiast Craig Ruff for the ROM dump and disassembly.
8" Floppy Playlist: youtube.com/playlist?list=PL-_93BVApb59tOBmcSGTdc79zuEgp6MxF&si=FWBA4AhHjoQ964gh
HP 9825 Playlist: youtube.com/playlist?list=PL-_93BVApb58Hy846J52DT8FeF9USYJUn&si=ubr1GO7EtGn5h8Iy
Ken's Silicon-on-Sapphire chip blog post: http://www.righto.com/2023/12/HP-silicon-on-sapphire-phi-chip.html
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
The video of our AGC round table talk is available on the VCF channel: youtube.com/watch?v=4Qx_XqnJtJw
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Nice video of the solenoid repair (in Russian!): youtu.be/PM-Lc8DpLFc
Previous video where we tear down a failed Capxon capacitor and a good capacitor: youtu.be/Z4Kp8BDMzHY
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
8" Floppy Playlist: youtube.com/playlist?list=PL-_93BVApb59tOBmcSGTdc79zuEgp6MxF&si=FWBA4AhHjoQ964gh
HP 9825 Playlist: youtube.com/playlist?list=PL-_93BVApb58Hy846J52DT8FeF9USYJUn&si=ubr1GO7EtGn5h8Iy
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
HP Multislope II ADC patent: patents.google.com/patent/US4357600A/en
Ian Scott Johnston video on HP 3457 backlight mod: youtu.be/oEu7nqOkKxo
Blacklight display mod: eevblog.com/forum/testgear/another-hp3478a-backlight-display-hack
LCD protocol reverse engineering: eevblog.com/forum/projects/led-display-for-hp-3457a-multimeter-i-did-it-)/msg1347268/#msg1347268
OLED mod: eevblog.com/forum/testgear/hp3548-hp3457-oled-display
Ken Shirriff's Nanoprocessor reverse engineering: http://www.righto.com/2020/09/hp-nanoprocessor-part-ii-reverse.html
Ken Shirriff’s reverse engineering of the hybrid in Marco Reps’ HP 3458: https://x.com/kenshirriff/status/1448392567167479812?s=61&t=UXfboHQEfahjAKeGVe1J8w
Jeff Peletz amazing HP instrument pictures: http://hparchive.com/wallpaper
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo Guidance Computer Restoration Series: youtube.com/playlist?list=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7
More videos showing some of Steve Jurvetson’s collection:
Steve’s collection part 1: youtu.be/3Y-MosGsFMs
Steve’s collection part 2: youtu.be/5ZBRw07Ibgo
Steve’s collection part 3: youtu.be/3Y-MosGsFMs
Virtual AGC Github repository:
github.com/virtualagc/virtualagc
Stuff that supports the channel:
- Amazon links for the tools I use in the lab: curiousmarc.com/amazon-links
- Channel merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Summary of previous episodes
02:05 The F8 Fly-By-Wire pallet
03:43 Why Digital Fly-By-Wire?
06:24 NASA Dryden Flight Research Center
08:08 NASA's F8 DFBW program
14:10 Shuttle support missions
15:20 Inspecting the pallet
19:05 Apollo SPS engine
20:43 Core rope extraction
24:58 Liquid Nitrogen cooling
25:56 Reading the core ropes
29:22 Running and explaining the recovered software
32:20 Mike's core rope recovery to date
Depstech DS630 endoscope: amzn.to/41ZnA4s
Depstech Official Website : www.depstech.com
Bendix MG-1 Restoration Playlist: youtube.com/playlist?list=PL-_93BVApb59k-GD2e83E6prrhm5fobtV
Ken Shirriff articles on the Bendix MG-1 Central Air Data Computer:
righto.com/2023/02/bendix-central-air-data-computer-cadc.html
righto.com/2023/10/bendix-cadc-reverse-engineering.html
righto.com/2024/01/bendix-cadc-pressure-transducers.html
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- New! Better quality merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
- Depstech Endoscopes: depstech.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Recap of previous episodes
01:34 Bendix computer principle of operation
03:26 First round of repairs
05:44 Depstech endoscope
08:08 First pressure sensor power up
10:58 Angle of attack sensor power up
12:18 Second round of repairs
16:18 It finally works!
16:46 Powering the tester with the Apollo inverter
18:44 Flight instruments
19:52 Demo time!
25:08 Outro and beauty shots
Atkelar's Second HP 410C Restoration: youtu.be/VlpNK7vdQKA
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Some previous videos about the clocks:
Solari Flip Clock: youtube.com/playlist?list=PL-_93BVApb59Xs5gCX_Sch1LoIm8TcWQ2
Soyuz Space Clock youtube.com/playlist?list=PL-_93BVApb5-951yH6TlPobwnQkLYWnDW
TI bubble LED clock hack: youtu.be/m_juPAK7I_I
Cesium Atomic Clock: youtu.be/eOti3kKWX-c
Amano punch clock: youtu.be/Dm4FtcmsJXo
IBM Blinkenlight Tester: youtu.be/Z8PdWIZFVEk
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- New! Better quality merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Original QST article: drive.google.com/file/d/1DROZ-5wChx-jCNFvJOHm65JZ4pJGvPN-/view?usp=drive_link
My corrected version is further down below.
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- New! Better quality merch on Fourthwall: curiousmarc-shop.fourthwall.com
- Legacy channel merch on Teespring (I don't have everything transferred to Fourthwall yet): teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
My corrected Jingle Bells Teletype score below:
----------
CuriousMarc's Jingle Bells for TTY
F stands for FIGS
X stands for LTRS
Z stands for Space
Cr is Carriage Return
Lf is Line Feed
Other letters are as typed
Don’t type the actual spaces, they are just for visual aid
----------
Cr Lf
FSFSFSXMFS FSFSXEFSFS FSFFSSXRRY
ZFFSFSFSFF SSFSFSFSSS
FSFSFSFSXC FSXHFSFSFS XRFSFSFSXI
FSFSFSFFSS XSTMASFSFS
FSFFSSFSFS FSSSFSFSFS FSXZANFSSS
FSFSFSFSXD ZAFSSSFSFS
FSFSXZHAFS SSFSFSFSFS FSFSFSSSFS
FSFSFSXP FFFSSS
FSFSFSFSFF FFFSSSFSFS
FSFSFFFFFS SSFSFSFSFS FSFSFSSSFS
FSFSFSFFFS XPFSFSFSXY
FSFSFSXZFS FSFSFFSSXN EWZYFSFSFS
FFSSFSFSFS SSFSFSFSFS
XEFSXAFSFS FSXRFSFSFS XZFSFSFSFF
SSXTOZALFS FSFSFFSSFS
FSFSSSFS FSFSFSXL
Cr Lf
----------------
Time stamps:
00:00 The original QST article
01:14 Trying the QST score
03:30 Upgrading to a Teletype orchestra
07:56 Editing the tape
14:18 Corrected tape rehearsal
16:36 Jingle Bells Teletype Performance
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo Comms Playlist: youtube.com/watch?v=v49ucdZcx9s&list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
ibiblio.org/apollo/Documents/HSI-481260.pdf
Elevator Music Credit: Crinoline Dreams by Kevin MacLeod
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Support the team on Patreon: patreon.com/curiousmarc
Buy shirts on Teespring: teespring.com/stores/curiousmarcs-store
Learn more on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Our Apollo receiver has been modified
05:20 Reverting the modification
07:41 Retuning the filter assembly
11:40 First receiver tests
13:38 How to extract downvoice with a ham radio
15:45 First voice trials, not working!
16:49 Tracking the fault in the spacecraft transmitter
20:35 Receiving downvoice!
Correction: 03:26 Frank Landspurg (not Landsman)
Correction: 05:09 Frank Landspurg (not Dave Landsman)
Usagi Electric Channel: youtube.com/@UsagiElectric
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
More videos about it here: youtube.com/playlist?list=PL-_93BVApb5_GbzkFwdKpuyPo8Ty83h8b
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Teletype model 19 restoration playlist: youtube.com/playlist?list=PL-_93BVApb5-9eQLTCk9xx16RAGEYHH1q
ASR33 Teletype restoration playlist: youtube.com/playlist?list=PL-_93BVApb5-84G5kmgfuu7TQduTMc73H
3M Whisper Writer Telex: youtu.be/4ta-AWDALyY
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
"Elevator Music" Credit: Crinoline Dreams by Kevin MacLeod
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Mike Stewart's Core Rope Visualizer: http://apolloguidance.computer/rope/
Apollo Guidance Computer Restoration Playlist: youtube.com/playlist?list=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7
Core Memory Videos:
youtu.be/AwsInQLmjXc
youtu.be/7ozNMgx7WtQ
youtu.be/e9ih93tuH1k
Look Mum No Computer Core Rope Drum Machine: youtu.be/zytjONYkU94
Mike's Electric Stuff Soviet Dialer: youtu.be/tPT6nIRFI_I
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Intro: Apollo Guidance Computer restoration
02:21 What is core rope memory?
05:16 Previous core rope recoveries with our AGC
06:44 Our AGC is sold at auction
07:36 Mike's core rope reader prototype
11:09 Last minute core rope "hack" for Apollo 11
14:04 Software recovered so far
14:48 Trying the reader for the first time and error
17:56 Core rope explanation: data encoding
20:13 Transformer rope is not core rope
21:24 Core rope explanation: reading using bistable cores
26:09 Core rope explanation: molybdenum permalloy cores
28:22 Experimental demo of moly cores
31:49 Core rope explanation: addressing with inhibits
33:59 Apollo core rope simulator, inhibit wires
35:56 Set and reset wires
37:45 Parity wires and the design error
45:02 Mike fixes the reader and tries again
47:38 Success! Congrats Mike!
Usagi Electric (Electric Bunny in Japanese) is visiting us. And I have the very floppy drive his Centurion minicomputer is missing. In this episode, we repair the head actuator brake with a professionally printed 3D part, and demonstrate how to realign the drive with a professional alignment diskette as well as without it. There will be professional bunnies at the end, promised.
See Usagi Electric install this very floppy drive in his Centurion:
youtu.be/-jA3ATLpUtM
youtu.be/X3y7OUERyJg
All you never wanted to know about 8" floppies:
youtu.be/oL0LXSE1jeM
Repair of the previous 8" floppy drives:
youtu.be/ZWosbEn3YbE
youtu.be/suXx5ExyWeE
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Previous video about the HP 5257A 18 GHz transfer oscillator plugin:
youtu.be/sl_Zh-IxVTA
Further documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
Further documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Recap of previous episodes
00:43 New pile of plugins!
01:47 HP 5264A Preset Unit Plugin Test
04:11 HP 5262A Time Interval Unit Test
05:53 HP 5257A Transfer Oscillator Test
08:05 Transfer Oscillator Explanation
13:27 Fault #1 Debug
20:00 Fault #2 Debug
25:14 It works again
26:41 Now part the Apollo setup!
Get your PCBs from our sponsor PCBWay: pcbway.com
Schematics:
drive.google.com/file/d/1tic2lBHaCRsTtSF1C1Mao24fTiy_fqKu/view?usp=share_link
Full project info (Kicad files, ROMs, etc...) on my website:
curiousmarc.com/computing/3m-whisper-writer-telex
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
My HP 5255A manual high resolution scan:
archive.org/details/hp-5255-a-frequency-converter-operating-and-service-manual-05255-9022-may-1967
Further documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Summary of previous episodes
00:53 The very broken 12.4 GHz plugin
02:19 Operating principle (with elevator music)
06:30 Opening the unit
09:35 Faulty video amp?
12:53 Debugging the Automatic Gain Control
15:48 Debugging the bias
17:32 RF self-oscillation hell!
22:11 Nursing the amp back to life
25:00 Debugging the power meter circuits
32:45 Debugging the gate extender
37:56 Finally measuring microwaves!
39:20 Discovery of another video amp issue
42:12 Debugging the weird low frequency suckout
47:37 Plot twist: RF mixer surprise!
52:22 Did we finally repair it?
55:42 Epilogue: comparing with another plugin
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Theme song: Festive Dinner by Pony Music
Thermal Camera TC002(IOS): amazon.com/dp/B0BYHP8KM9 (Apply $70 coupon:$229)
We power up our analog computer for the first time, and are stumped by evil magnetic amplifiers.
Bendix MG-1 Restoration Playlist: youtube.com/playlist?list=PL-_93BVApb59k-GD2e83E6prrhm5fobtV
See Ken’s full explanation of the inner workings of this computer in his blog article: http://www.righto.com/2023/02/bendix-central-air-data-computer-cadc.html
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo 13 Accident Troubleshoot Analysis: youtu.be/ZUeFwyicV8o
Apollo Guidance Computer Restoration: youtube.com/playlist?list=PL-_93BVApb59FWrLZfdlisi_x7-Ut_-w7
Apollo Communications Electronics: youtube.com/playlist?list=PL-_93BVApb58SXL-BCv4rVHL-8GuC2WGb
Links to documentation:
CSM Block II Schematics: ibiblio.org/apollo/Documents/HSI-481260.pdf
CSM Block I Schematics: ibiblio.org/apollo/ApolloProjectOnline/Documents/CSM%20104%20Systems%20Handbook%2019690124.pdf
Circuit Utilization Panel Diagrams: curiousmarc.com/space/apollo-circuit-utilization-panel#h.zi7epqr36uoz
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Support the team on Patreon: patreon.com/curiousmarc
Buy shirts on Teespring: teespring.com/stores/curiousmarcs-store
Learn more on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
Documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
Documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Summary of previous episodes
01:02 Into the broken 3 GHz plugin
04:05 Mechanical repair
07:52 First try
10:09 Multiplier repair
12:22 Second try
13:36 Multiplier alignment
15:36 Third try
16:27 Second mechanical repair and realignment
22:59 Fourth try - it works!
24:20 Measuring the Apollo S-band transmit frequency
Bendix MG-1 Restoration Playlist: youtube.com/playlist?list=PL-_93BVApb59k-GD2e83E6prrhm5fobtV
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
Documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Summary of previous episodes
01:00 The many plug ins for the HP 5245L
02:25 Making the extender cable
03:06 HP 5253 converter principle of operation (with elevator music)
07:58 Inspection and tryout of our first HP 5253A plugin
10:56 Summary of the first HP 5253B repair
11:27 Taking apart the second HP 5253A
14:02 Stuck gearing repair
15:37 Disassembling the "Do Not Disassemble" microwave cavity
19:13 Coaxial resonant cavity explanation (with elevator music)
23:05 Reassembling the cavity
26:19 Testing the repaired HP 5253A plugin
27:15 Comparing with the second HP 5253B cavity
28:26 Testing the second HP 5253B plugin
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Apollo 13 incident composite loop is on my website here:
curiousmarc.com/space/apollo-s-band-communications#h.kuc8m1at9uu4
An even better way to listen to the Apollo 13 audio is to go to:
apolloinrealtime.org/13
Select "join at launch-1minute", then pause it and go to mission time 55:54.
To get an even better listen, go to the Mission Audio Control tab, and click on EECOM. You'll hear even more of the backroom discussion between EECOM and EPS
The episode about the fuel cell is here:
youtu.be/5ZBRw07Ibgo
Links to doc:
curiousmarc.com/space/apollo-s-band-communications
virtualagc.github.io/virtualagc/QuestForInfo.html
ibiblio.org/apollo
Music Credit: Crinoline Dreams by Kevin MacLeod
Our sponsors
- PCBWay: fast turn PCBs, pcbway.com
- ElectroRent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Support the team on Patreon: patreon.com/curiousmarc
Buy shirts on Teespring: teespring.com/stores/curiousmarcs-store
Learn more on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
Documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 Summary of previous episode
01:16 Board A21 gate signal repair
04:10 Why is it still not counting?
06:31 Board A17 fast counter repair
11:19 Still not counting right
12:28 Board A15 counter/display explanation
14:20 Taking apart the Nixie decoder
16:25 Board A15 counter neon bulb debug
19:22 Reset issue discovery
20:48 Nixie decoder reassembly and test
21:56 Board A23 reset debug
23:39 Reset fault cured
25:48 Repaired!
5245L Repair-a-thon Playlist: youtube.com/playlist?list=PL-_93BVApb5_MQBUOVLgdKCaUPY1zaPh_
Documentation on my website: curiousmarc.com/instruments/hp-5245l-nixie-counter#h.ixw2jz3t1jtb
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
00:00 The HP 5245L, king of 1960s counters
02:06 HP instruments at an Apollo tracking station
03:19 Looking inside and first turn on
06:04 Power supply check
06:30 Crystal oscillator check
08:58 Backplane and previous failed repairs
10:22 10 MHz Multiplier repair
12:25 Board A35 Time Base Repair
15:24 Board A19 Input checkout
16:41 Board A21 Function Control checkout
19:17 Board A21 repair
25:28 The differentiator works!
26:27 Gate signal fault
27:14 Summary of Episode 1 repairs
Bendix MG-1 Restoration Playlist: youtube.com/playlist?list=PL-_93BVApb59k-GD2e83E6prrhm5fobtV
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about
Stuff that supports the channel:
- Amazon links for the tools I use in the lab (supports the channel if you buy from there)
curiousmarc.com/amazon-links
- Channel merch on Teespring: teespring.com/stores/curiousmarcs-store
- Support us on Patreon: patreon.com/curiousmarc
Our lovely sponsors
- PCBWay: fast turn PCBs, pcbway.com
- Electro-Rent: electrorent.com
- Keysight: test instruments: keysight.com
- Samtec: connectors: samtec.com
- R&D Microwaves: rdmicrowaves.com
Get more technical info on the companion site: curiousmarc.com
Contact info: youtube.com/curiousmarc/about