I'm having trouble getting telemetry. ARISSatTLM will see the signal on the Tuning Indicator and I have tuned the CW signal everywhere from the yellow mark to the top and bottom of the blue range. It decodes the CW fine in the Morse Code Decoder window but nothing ever shows up in the Telemetry As Text or ARISSatTLM main window. The orange indicator is following something, usually hanging around the middle of the orange line range when there is a signal. Any thoughts? Windows Vista SP2 with M-Audio Delta44 sound card set for 48000Hz sample rate.
Thanks! Jerry N0JY
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Hi Jerry,
Is there anything between the speaker out and line in (or mic) on the sound card?
What are you using for radio/Doppler control?
Mark N8MH
At 11:31 AM 8/6/2011 -0500, N0JY wrote:
I'm having trouble getting telemetry. ARISSatTLM will see the signal on the Tuning Indicator and I have tuned the CW signal everywhere from the yellow mark to the top and bottom of the blue range. It decodes the CW fine in the Morse Code Decoder window but nothing ever shows up in the Telemetry As Text or ARISSatTLM main window. The orange indicator is following something, usually hanging around the middle of the orange line range when there is a signal. Any thoughts? Windows Vista SP2 with M-Audio Delta44 sound card set for 48000Hz sample rate.
Thanks! Jerry N0JY
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Hi Mark,
I'm using the speaker output so it's speaker audio with no additional filters, right to the Delta44 breakout box. SatPC32 does the doppler, it's set for 20Hz interval. Should I set that lower, to 10Hz perhaps? I am going to try to use the audio from the data output on the FT-736R. A brain fade on my part prevented me from getting the signal off the ring of the stereo connection, but I just woke up and remembered that I have the splitters for that so I've got that connected to the breakout box now!
73, Jerry
On 8/6/2011 12:44 PM, Mark L. Hammond wrote:
Hi Jerry,
Is there anything between the speaker out and line in (or mic) on the sound card?
What are you using for radio/Doppler control?
Mark N8MH
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The message was checked by ESET NOD32 Antivirus.
I'm having trouble getting telemetry. ARISSatTLM will see the signal on the Tuning Indicator and I have tuned the CW signal everywhere from the yellow mark to the top and bottom of the blue range. It decodes the CW fine in the Morse Code Decoder window but nothing ever shows up in the Telemetry As Text or ARISSatTLM main window. The orange indicator is following something, usually hanging around the middle of the orange line range when there is a signal. Any thoughts? Windows Vista SP2 with M-Audio Delta44 sound card set for 48000Hz sample rate.
Thanks! Jerry N0JY
I was also having trouble getting telemetry. Signal was quite strong and all indicators was within range. The telemetry and CW stopped twice within pass. CW was decoded but maybe the deep QSB made some impact to the telemetry. I have 2x 17 el horizontal yagis, FT-847 and Realtek AC97 audio system. Sampe rate was 44.1 kHz. Next time I try Edirol UA-1 USB sound card. Have to set alarm clock at 4 am local time as this is the only time ISS is well above horizon... :-)
And please try the ARISSatTLM software and decode some frames as it is no help if you just say you can hear some noise...
-jari oh3uw
On 8/6/11 9:31 AM, N0JY wrote:
I'm having trouble getting telemetry.
Jerry, is this a night-side pass with the satellite in low power mode? The coding is not optimal for a signal that's present only a small fraction of the time, as it takes 16.384 sec at AOS to "fill the pipe" in the de-interleaver used to combat fading. It's barely done that when the transmitter turns off again at 40 sec.
It works much better on the day-side passes with a continuous signal, even if it's fading deeply.
The CW beacon is 1 kHz below the (suppressed) carrier of the BPSK-1000 beacon. Make sure your radio is in USB mode and accurately tune the CW beacon so that it comes out at 500 Hz. This will center the BPSK at 1500 Hz. It extends from 500 to 2500 Hz (2 kHz total bandwidth) between spectral nulls. That's not much narrower than a regular SSB filter, so make sure your passband shift filter, if any, is set to pass it.
73, Phil
Hi Phil,
Yes, it was last night around midnight-thirty Central Time. I had done some earlier tries during the "warm up" testing last weekend in the daylight with no good result, though. I have switched the input to my Windows 7 PC and I will let it capture what it does tomorrow morning, to compare. Since the daylight passes will all be while I'm at work, perhaps I'll alternate between the Vista and the Windows 7 PCs during the week to see what I come up with.
Thanks and 73, Jerry N0JY
On 8/6/2011 2:17 PM, Phil Karn wrote:
On 8/6/11 9:31 AM, N0JY wrote:
I'm having trouble getting telemetry.
Jerry, is this a night-side pass with the satellite in low power mode? The coding is not optimal for a signal that's present only a small fraction of the time, as it takes 16.384 sec at AOS to "fill the pipe" in the de-interleaver used to combat fading. It's barely done that when the transmitter turns off again at 40 sec.
It works much better on the day-side passes with a continuous signal, even if it's fading deeply.
The CW beacon is 1 kHz below the (suppressed) carrier of the BPSK-1000 beacon. Make sure your radio is in USB mode and accurately tune the CW beacon so that it comes out at 500 Hz. This will center the BPSK at 1500 Hz. It extends from 500 to 2500 Hz (2 kHz total bandwidth) between spectral nulls. That's not much narrower than a regular SSB filter, so make sure your passband shift filter, if any, is set to pass it.
73, Phil
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participants (4)
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Jari Koivurinne -
Mark L. Hammond -
N0JY -
Phil Karn