Space Station SSTV testing event

[jwt873]

A search for SSTV equipment on the ISS shows that they have been using an ordinary
Kenwood TH-D710G running at 25 Watts. So I think it would be pretty safe to say that the standard pre-emphasis is used on transmit.

But I'm not sure if they're still using the same radio.. The event was to check out "replacement hardware".. Could be a new radio, but I can't find anything on it.

 

[N4DJC]

The service module (Russian side) has the Kenwood radio set up as the APRS digipeater stowed for some reason. I think they have a total of six onboard. 25 watts is normal power output for SSTV. They were running only 5 watts but I think they're running 10 watts on the Columbus module for APRS and Crossband repeat, they run 25 watts for school contacts.

 

[wd9ewk]

The service module (Russian side) has the Kenwood radio set up as the APRS digipeater stowed for some reason. I think they have a total of six onboard. 25 watts is normal power output for SSTV. They were running only 5 watts but I think they're running 10 watts on the Columbus module for APRS and Crossband repeat, they run 25 watts for school contacts.

With the newer TM-D710Gs, the cross-band repeater runs at 5W, the digipeater at 10W, and school contacts along with contacts using the old pair of 2m frequencies (not used lately, once crews started joining in on the cross-band repeater) run at 25W. The digipeater is less stress on the transmitter compared to the cross-band repeater, so the digipeater was programmed at a higher TX power level than the cross-band repeater in the custom firmware on those radios.

I don't remember how much TX power the Russians set for the old TM-D710 for SSTV. It may be 25W, which could explain the time between picture transmissions to give the radio a break.

73!