CuriousMarc | HP 5245L Nixie Counter - Part 4: HP 5254A 3 GHz Plugin Repair @CuriousMarc | Uploaded 1 year ago | Updated 2 days ago
We repair our 3 GHz Nixie frequency counter plugin, the HP 5254A. 3 gig, not bad for 1964! Things are spicier than with our previous and tamer 500 MHz plugin, so we have to break out the microwave test equipment.

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