[amsat-bb] Receiving MYSAT-1 telemetry

[Carlos Picoto]

Ken in addition to what Scott mentioned,



I use a configuration that launches multiple versions of the UZ7HO for different sats and it has repeatedly decoded MYSAT-1 with the following config:



I use 6250hz for  bandwidth  on SDR# and have the BSPK ChA set to 3472 and Audio slider on SDR# is between 3rd and 4th





2019-02-19 16:36:57.541 UTC: from A68MY to A68MY-1 (UI, payload: 42 byte)

000 > C0 00 82 6C 70 9A B2 40 E2 82 6C 70 9A B2 40 61 03 F0 41 36

020 > 38 4D 59 01 0D 00 00 00 F9 08 08 00 04 42 00 00 00 00 04 A8

040 > 30 6C 5C 89 8C 88 88 89 89 8D 21 01 52 52 00 00 C4 00 8F 00

060 > C0



À.‚lpš²@â‚lpš²@a.ðA68MY.....ù....B.....¨0l\‰Œˆˆ‰‰!.RR..Ä..À

________________________________________________________________________________

2019-02-19 21:27:09.306 UTC: from A68MY to A68MY-1 (UI, payload: 42 byte)

000 > C0 00 82 6C 70 9A B2 40 E2 82 6C 70 9A B2 40 61 03 F0 41 36

020 > 38 4D 59 01 0D 00 00 00 08 4D 08 00 04 44 00 00 00 00 03 AD

040 > 74 6C 5C 8B 8F 8A 8A 8F 8B 94 21 01 52 53 00 00 AD 00 83 00

060 > C0



À.‚lpš²@â‚lpš²@a.ðA68MY......M...D.....­tl\‹ŠŠ‹”!.RS..­.ƒ.À





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________________________________
From: AMSAT-BB <amsat-bb-bounces at amsat.org> on behalf of Scott <scott23192 at gmail.com>
Sent: Tuesday, February 19, 2019 5:24:26 PM
To: amsat-bb at amsat.org
Subject: Re: [amsat-bb] Receiving MYSAT-1 telemetry

Hi Ken!

Things certainly sound right from your description, but just for comparison
sake here's an image of a MYSAT-1 packet as I was decoding from a recording
some time ago:

https://www.qsl.net/k/k4kdr//images/mysat-1--iq-replay.png

... you might also want to check the "Modem Setttings" in UZ7HO SoundModem
and make sure that "non-AX25 filter" is NOT checked.  FYI, I normally leave
"KISS Optimization" checked and "PreEmphasis filter" with "All" checked.

-Scott,  K4KDR

=========================

On Tue, Feb 19, 2019 at 4:38 PM Ken Swaggart <k.swaggart at charter.net> wrote:

> I've been trying to decode the 1.2k BPSK telemetry from MYSAT-1 (44045)
> without success. I'm using UZ7HO's SoundModem set for BPSK AX.25 1200 bd.
> The SDR is set to USB with 4 KHz bandwidth and the signal is strong with a
> 25 dB SNR.  The received signal is right in the center of the soundmodem's
> waterfall between the upper and lower indexes for that BPSK mode.  I'm
> obviously missing something here!
>
> 73,
> Ken, W7KKE
>
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