Re: MMSSTV and ARRISat-1

30 Dec 2011

      I've had good luck with MMSSTV using a Fun Cube Dongle, SDR-Radio and then
Virtual Audio Cable to get the audio from SDR-Radio to MMSSTV (all on the
same PC).  Today I threw in a 4KHz filter from SDR_Radio and that seems to
improve the S/N ratio.  There was a lot of noise removed by that filter.
BTW, I picked up Farrell's license plate quite cleanly around 1800z
although I did not get the start clearly enough to lock onto, so the
picture has the top cut off.
I also noticed some idle in both the telemetry and the FM.   A few times I
seemed to be getting strong telemetry but got only Kursk frames, or 5 Kursk
and 1 satellite.  Another time, there was no FM audio for 10 or 15 seconds
although there was a carrier.  Oddly the telemetry continued, but the CW
over on the edge of the telemetry band stopped.  I'm not sure I get that,
although looking at the code on the satellite might show something.  At one
point I certainly saw the little guy in low power mode, but the dropouts I
mention above are not that.  The transmitter was still on....
Burns, W2BFJ
...
Date: Fri, 30 Dec 2011 14:57:31 -0500
From: "Zachary Beougher" zack.kd8ksn@hotmail.com
To: "kp hpjr" inservice2him@hotmail.com, amsat-bb@amsat.org
Subject: [amsat-bb] Re: MMSSTV and ARRISat-1
Message-ID: SNT111-DS5C3FD0E1BCED394A4AFDBB3920@phx.gbl
Content-Type: text/plain;       charset="iso-8859-1"
I had a similar issue when I first started downloading SSTV, and if I
recall correctly I believe it was because I had the input audio set way too
high (I cranked it down to just about no audio to get a clear pic).  If you
have downloaded pictures before from HF and have had success at your preset
audio levels, then I doubt that is the issue.
Zack
KD8KSN
From: kp hpjr
Sent: Friday, December 30, 2011 2:41 PM
To: zack.kd8ksn@hotmail.com ; amsat-bb@amsat.org
Subject: RE: [amsat-bb] Re: MMSSTV and ARRISat-1
Zack and others.
Yes, audio feed is direct as with all digi modes I operate.
Just had a pass of ARRISat-1 of 45 degrees plus over head. The downlink
into my M2 5 element yagi @ 35 degrees elevation was S-9 plus 10db. A very
good  (great) signal.
2 times during the pass the SSTV was transmitted. During neither of them
did the program initialize and copy anything. Partway through the 2nd
transmission I forced it into RX Robot-36. All that occured was for it to
stop after about 5 seconds. Again nothing decoded....frustrating to say the
least. I'd like to get 1 photo...HI.
Using the exact same setting I have had several QSO's now on HF sending
and receiving very clear photos.
Not sure what else to try.
N0KK, Kirk
...
From: zack.kd8ksn@hotmail.com
To: inservice2him@hotmail.com; amsat-bb@amsat.org
Date: Fri, 30 Dec 2011 07:48:57 -0500
Subject: [amsat-bb] Re: MMSSTV and ARRISat-1
Hi Kirk,
Like Greg said, ARRISat-1 is Robot 36. I also found that I received the
clearest pictures when I ran the audio directly into the pc versus
letting
...
it pickup the audio from a speaker. I imagine you are probably already
doing this.
73!
Zack
KD8KSN
-----Original Message-----
From: kp hpjr
Sent: Wednesday, December 28, 2011 4:35 PM
To: amsat-bb@amsat.org
Subject: [amsat-bb] MMSSTV and ARRISat-1
GA,
All the talk about SSTV from this bird got me thinking I'd like to try!
I downloaded MMSSTV and installed.
What are the best settings to use in the setup page for decent copy of
photos from ARRISAT-1?
I did copy pix on 14.230 after setup as a test run...but on last pass of
ARRISAT, had wonderful copy of voice beacon but no pictures decoded.
So wonder what I might be doing wrong.
Any help appreciated.
Kirk, N0KK

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End of AMSAT-BB Digest, Vol 6, Issue 699

Burns Fisher

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