[amsat-bb] unable to dig over ISS

[Robert Bruninga]

If the ISS radio is the Kenwood D700, it is quite sensitive to  unbalanced
tones.  So your base station might work well with a local digi, but if the
low tone is higher than the high tone by just a bit (or other way around),
it will not be decoded by the D700.  This is because the kenwood is
optimized for flat tones (at the discriminator) not pre-emphasized as most
people do when they hook up an external TNC to the mic circuits.

(I may have the tones reversed).  One of them can be higher than the other
a bit and work fine.  The other way around it simply will not work.
Bob

-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of D. Craig Fox via
AMSAT-BB
Sent: Monday, May 18, 2020 6:18 PM
To: 'k6vug at sbcglobal.net' <k6vug at sbcglobal.net>; amsat-bb at amsat.org
Subject: Re: [amsat-bb] unable to dig over ISS

Thanks Umesh. Well I would agree except that several nights ago I pulled
out the D7 HT and elk, and digipeated numerous times on a nigh pass.
Immediately went to the base station and tried but no dice. Plus, on every
pass Ive tried on my base station, I see the stations I decoded show up on
the ISS spotter. So it remains as issue at my end.

Thank you

Craig
N6RSX

From: k6vug at sbcglobal.net <k6vug at sbcglobal.net>
Sent: Monday, May 18, 2020 2:22 PM
To: amsat-bb at amsat.org; D. Craig Fox <DCFox at rwglaw.com>
Subject: Re: [amsat-bb] unable to dig over ISS

Looking at when the problem started, I'm assuming the problem is related
to ISS turning off their packet systems regularly.

Long ago I was able to operate ISS packet throughout the pass, even drop
messages into their their BBS, etc., but for a considerable time now I
have pretty much given up working with ISS packet.

All other factors considered, the fact that your system gets ACK-ed on
144.390 is proof positive.  It has always been a guarantee to be able to
work ISS packet.

73!
Umesh,k6vug





On Monday, May 18, 2020, 11:40:40 AM PDT, D. Craig Fox via AMSAT-BB
<amsat-bb at amsat.org<mailto:amsat-bb at amsat.org>> wrote:


Posting this as a last resort as I ordinarily enjoy doing my own
troubleshooting, but this one has me perplexed. For normal sat ops I am
running a TS2Kx, 5 el 2m and 11 el 70 cm Directive Systems yagis on a
G5400. Doppler and rotor all run by SatPc32.  Up to about a year ago I ran
AGWPE and UISS and a USB Signalink (through ACC 2) to dig over ISS. Never
had a problem, except the occasional decode problem fixed by UX7HO
Soundmodem. I finally removed AGWPE and began using Sound Modem with UISS.
However, since then I have been unable to dig over ISS.  I decode just
fine. My transmissions sound like normal packet transmissions, listening
on a second receiver. I have used all of the online recommended settings
for both Sound Modem and UISS. I have played with the audio levels. I
substituted Signalinks in case that was the issue. Also, I have no problem
sending APRS over 144.39 using different "wide" settings and getting an
acknowledgement back. My "neighbor" Christy KB6LTY has provided mu ch
assistance, but still no joy.  I am missing something. So I'm hoping
someone has had a similar issue with a similar set up and can maybe send
me screen shots of their settings that work, especially in Sound Modem.
Or, any other suggestions would be greatly appreciated.

Thank you in advance

Craig
N6RSX
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