Any info on today's EVA? Did it happen already?
ISS suit freqs and modes
- Thread starter ind224
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I was watching two hours ago...yeah they're still at it. Should be over western U.S. shortly. That's Pacific Time.
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dickie757
Wired
US based comms from EMU are impossible to decode. I captured a stream and heard some digital noise, but besides creating a 2 GB 135Mbps sample, all I can say is....yep, there was a radio signal.
spacellamaman
Member
Well, it's something
I neither observed nor heard anything on 414.2, 417.1 and 130.167. I was well within the footprint.
dickie757
Wired
The capture was back in February. Practically overhead. I put my mag-mount dual band on the side of car attached to rtl-sdr attached to sdr console. This was on my lunch break. The emissions I saw and heard moved all over, not from doppler. I could only record for a fixed length, and had to start recording again. I'll put a video up at some point. I'll try to host the raw IQ captures, too.
ind224
Member
I'm happy with color bars, Morse IDs, and stuck mics. Knowing an SDR gets something is cool.
spacellamaman
Member
Can anyone point me in the direction of info about when/where the 414.2/417.1 freqs came into play? Or how/when this was discovered they were in use? I used to try pretty hard to pick up comms off of the ISS, but its been a year or two since I was actively pursuing them. They're new to me and if it weren't for so many people talking about it I would have just thought someone was mistaken.
dickie757
Wired
Start at post 16
ISS suit freqs and modes
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.
Here is a link to the NASA audio UHF training manual dated 2006. At least at that point in time it mentions the 414.2 and 417.2. Read through it and glean some additional frequencies.
dickie757
Wired
And post 17 has this link with info stating first flight in 1998
spacellamaman
Member
Thanks fellas, ask and ye shall receive!
ind224
Member
Yes being so old I wonder why no one has cracked it yet. By that I mean the mode, it is possible the voice is encrypted like the telemetry but until proven so I'm hopeful. We could just go back to VHF simplex and let the computer handle the telemetry and control, right, Hal?
dickie757
Wired
"No, Dave."
I suppose because it is such a weak signal, and extremely intermittent, the chance to even grab the signal is hard enough. I think it might be spread spectrum, too.
I suppose because it is such a weak signal, and extremely intermittent, the chance to even grab the signal is hard enough. I think it might be spread spectrum, too.
ind224
Member
And I just checked Heavens Above no good 3 MAY passes for me, I'll have to try a remote receiver.
ind224
Member
Icom 2500 in France did the job via Global Tuners. With a discone it was mere seconds but actual Russian voices this time.
Bizarro twist; when I tried receivers in AU and NZ they are locked on an FM music station and an ATIS so a guest can't tune them apparently by law. ????
So, I waited for them to come back to France.
Bizarro twist; when I tried receivers in AU and NZ they are locked on an FM music station and an ATIS so a guest can't tune them apparently by law. ????
So, I waited for them to come back to France.
ind224
Member
Well, none of the equipment changes I had hoped for happened but with three passes and one of them being at almost 40* for Indy I have no doubt I will hear some solid Russian EVA today. NASA TV is up, event start 1020, my first pass about 1045.
How far ahead are EVAs announced, and where?
dickie757
Wired
I follow International Space Station, NASA, and ARISS on Twitter. ARISS posts planned outages due to work outside Station.
If you are a user of ARISS, you know they shut down APRS and the voice repeater during walks and other extra Station movements. It's OK, as they put the action on NASA TV live.
The logistics behind a spacewalk are mindboggling. The last few on the U.S. side have been in the works for years, as they are part of long term Station upgrades. The Russian walks were a bit of emergency work.
If you are a user of ARISS, you know they shut down APRS and the voice repeater during walks and other extra Station movements. It's OK, as they put the action on NASA TV live.
ind224
Member
9 AUG Russian EVA 60 1045 EDT scheduled start; Indy looks ripe for a pass right away!! 130.167 if you can 130.165 if you can't.
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