ISS suit freqs and modes

[dickie757]

Oh boy, I forgot about Doppler. We'll be lucky just to get 25kHz worth of FM voice dialed in.....

What's the bandwidth required for FSK at 695kbps? Take that, and subtract it from 1.4MHz, and that will be the amount of spectrum we will have to search to determine if the voice is analog or digital. If it is digital, based on my limited knowledge, I guess it will be a 60kHz wide signal, based on the quality I heard on the live stream.

Edit...I'm thinking strictly in the use of SDRs and looking at the waterfall. Unless some one can chime in, we are on a scavenger hunt.

 

[RFI-EMI-GUY]

It sounds from the description that the mode is digital and perhaps encrypted. You can bet that there is biomedical telemetry and space suit telemetry in that data stream .
Ground control to Major Tom, your O2 levels are getting low and your CO2 levels are rising.
Open the damn pod bay door HAL!

 

[dickie757]

Bucket list: trying to hear direct from suit during EVA but can't confirm simplex FM is being used most info I see is from Shuttle days.

Did you see that an Orlan suit EVA is scheduled for the 15th? And of course, US eva on 19th.

 

[VK3RX]

Cosmonauts and Astronauts Ramping Up for a Pair of Spacewalks

 

[RFI-EMI-GUY]

I hope someone will record these transmissions if they are analog.

 

[ind224]

Did you see that an Orlan suit EVA is scheduled for the 15th? And of course, US eva on 19th.

Thanks for the reminder; I'm not a math guy so I tried to check heavens-above for the predictions and the site is down 2 days now . If it's a good pass, I'll be listening and recording.

 

[dickie757]

The site works for me. What is your general location, I'll grab a screenie of the passes for your location

 

[VK3RX]

Spacewalk last Wednesday called off due coolant leak on docked Soyuz spacecraft:

Soyuz capsule damaged by uncontrolled leak

 

[dickie757]

@ind224 still gonna try? Space walk on 2-Feb. A couple good passes for me in Tidewater. Check heavens above...even if we can't decode, getting some squiggly lines on the screen will be cool

 

[ind224]

I'm mode limited, no SDR here but will be watching the walk on NASA TV via good old C band.
Tomorrow's do look like great passes hopefully they save some of that for Russian EVA's 56 57 58.
Supposed to be late Feb not sure why I can't find a finite time and date for them.
One source had both 56 and 57 listed as the 27th at 7P and 58 on Feb 31st lol.

 

[ind224]

Can a commercial big bux TDMA analyzer or test set like a Rhonde Swartz or Agilent work to confirm mode rates etc?

 

[dickie757]

Got it. It appears 130.167 does work but my Pro2045 insists on 130.1625 and still heard it. Next time I will have a yagi.

Cosmonaut spacewalk 18 April, 25 Apr, and 4 May. Not sure of times or timing
@ind224 just in case reply is not enough

 

[ind224]

Ty very much!! I had just relayed that info to a friend that is a space nut but she just watches events on NASA TV. The 18 April walk has an unusual ~ 0100 EST start time. Checking Heavens Above it looks like the stars are going to be indeed aligned and a near 0400 EST pass puts them at 88* for my location 46205. Been a long time coming I think these walks were delayed from Feb.

 

[krokus]

Has anyone tried using SatNog for monitoring an Orlan EVA?

 

[spacellamaman]

any confirmation for the April 25 walk?

 

[dickie757]

any confirmation for the April 25 walk?

Postponed. 28April next walk

 

[spacellamaman]

Postponed. 28April next walk

Much obliged to you.

 

[ind224]

Just to be clear 28 April is a US event and the Russian postponed is into May ???; the 4 May event already scheduled might be impacted as well.

 

[dickie757]

Right.

 

[ind224]

Wed 3 May and Friday 12 May Russian EVA's NASA TV to cover.