Uploaded May 2022 | Updated September 2026, 3 weeks ago
The radio repeater frequency on the ISS is 427.8 MHz, I've tuned the SDR to that and we'll watch the ISS pass. Current location of the ISS is in the insert.
As the ISS passes, you will be able to clearly see the doppler shift in the radio signal, it will be higher than the carrier (437.8 MHz) as it approaches, equal the carrier as it passes station (a line perpendicular to the path of the ISS passes through my location) and then it will drop below the carrier as it moves away.
We should get a couple of passes before the range is too far.
Discord Link:
discord.gg/nFf7EnMm8D
Frequency of the ISS Repeater: 437.8 MHz
amsat.org/amateur-radio-on-the-iss
Current Location of the ISS:
astroviewer.net/iss/en/index.php
Range of detection is 2500KM, we will acquire the signal HIGHER (to the right of center) than 437.8 because the ISS is approaching us. When it 'passes station' it will be on the center frequency of 437.8. As it moves away the frequency will drop below (to the left of center). This is a demonstration of the doppler shift. Brainiacs out there will be able to use the location and velocity of the shift to calculate the speed of the ISS.
NOTE: YOU MUST SUBSCRIBE TO THE CHANNEL (AT LEAST 5 MIN) TO POST TO THE LIVE STREAM. This is to build the audience for the live streams, you won't come if you don't know about them, so just hit the button and ring the bell.
Join our Discord Channel at
discord.gg/nFf7EnMm8D
Note, if the link does not work, check out the latest stream on Common Sense Science and a fresh link will be in the description!
Help the Channel by joining our channel as a member
Patreon- patreon.com/bobthescienceguy
or sending a Paypal for equipment (I do take requests for content)
paypal.com/donate?hosted_button_id=ED65DTMU9AB8C
The radio repeater frequency on the ISS is 427.8 MHz, I've tuned the SDR to that and we'll watch the ISS pass. Current location of the ISS is in the insert.
As the ISS passes, you will be able to clearly see the doppler shift in the radio signal, it will be higher than the carrier (437.8 MHz) as it approaches, equal the carrier as it passes station (a line perpendicular to the path of the ISS passes through my location) and then it will drop below the carrier as it moves away.
We should get a couple of passes before the range is too far.
Discord Link:
discord.gg/nFf7EnMm8D
Frequency of the ISS Repeater: 437.8 MHz
amsat.org/amateur-radio-on-the-iss
Current Location of the ISS:
astroviewer.net/iss/en/index.php
Range of detection is 2500KM, we will acquire the signal HIGHER (to the right of center) than 437.8 because the ISS is approaching us. When it 'passes station' it will be on the center frequency of 437.8. As it moves away the frequency will drop below (to the left of center). This is a demonstration of the doppler shift. Brainiacs out there will be able to use the location and velocity of the shift to calculate the speed of the ISS.
NOTE: YOU MUST SUBSCRIBE TO THE CHANNEL (AT LEAST 5 MIN) TO POST TO THE LIVE STREAM. This is to build the audience for the live streams, you won't come if you don't know about them, so just hit the button and ring the bell.
Join our Discord Channel at
discord.gg/nFf7EnMm8D
Note, if the link does not work, check out the latest stream on Common Sense Science and a fresh link will be in the description!
Help the Channel by joining our channel as a member
Patreon- patreon.com/bobthescienceguy
or sending a Paypal for equipment (I do take requests for content)
paypal.com/donate?hosted_button_id=ED65DTMU9AB8C
