[amsat-bb] unable to dig over ISS

Tue May 19 17:55:18 UTC 2020

A series capacitor (experimental value until you hear the change in pitch on
another radio) will boost the high tone.  A parallel cap to ground
(experimental value) can reduce the high tone...

ARISS reports that the ericcson radio on ISS is quite deaf and so needs to
hear some power.  Also, they are not sure if the ARISS alias works.  Try
RS0ISS.

Bob
bob

-----Original Message-----
From: D. Craig Fox <DCFox at rwglaw.com>
Sent: Tuesday, May 19, 2020 1:20 PM
To: 'Robert Bruninga' <bruninga at usna.edu>
Cc: amsat-bb at amsat.org
Subject: RE: [amsat-bb] unable to dig over ISS

Thanks Bob! Maybe that is the issue. Now I just need to figure out how to
analyze the tones being generated by my Signalink.

Thank you and 73

Craig
N6RSX

-----Original Message-----
From: Robert Bruninga <bruninga at usna.edu>
Sent: Tuesday, May 19, 2020 7:47 AM
To: D. Craig Fox <DCFox at rwglaw.com>; amsat bb <amsat-bb at amsat.org>
Subject: RE: [amsat-bb] unable to dig over ISS

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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