Hello Bent,
Do you at least share the footprint with the other station?
I suspect that the operator had the PL tone ON so his packets were being repeated through the FM repeater. I think that would make the packet look like it came directly to your station, without a path.
I understand that packet operators should turn their PL tone OFF in order to prevent this.
Congratulations to Nader for uploading three messages successfully! I am interested in his Wisp/MSPE TNC settings. For example, what the Retries time was set to, TxDelay, etc.
73,
Mark N8MH _____________ Odd frames from HO-68?
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Subject: [amsat-bb] Odd frames from HO-68? From: Bent OZ6BL oz6bl@xxxxxxx Date: Sun, 03 Jan 2010 11:43:32 +0100
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Hi
I have several times observed some oddly addressed frames from HO-68 as witnessed by this frame dump from this morning (conf http://www.amsat.dk/oz7sat_kiss/xw1/KISS-Sun_Jan_03_06_08_00_UTC_2010.html):
===== RR BJ1SA-12 -> UA9UIZ* N(R)=0 P/F:1 UI BJ1SA-12 -> BBSTAT* P/F:0 PID: F0 Open BJ1SA-12:1
RR BJ1SA-12 -> UA9UIZ* N(R)=0 P/F:1 DISC BJ1SA-12 -> UA9UIZ* P/F:1 DM UA9UIZ* -> BJ1SA-12 P/F:1 <====== UI BJ1SA-12 -> BBSTAT* P/F:0 PID: F0 Open BJ1SA-12:0
UI BJ1SA-12 -> BBSTAT* P/F:0 PID: F0 Open BJ1SA-12:0 ... ======
The odd one is the one I have marked. It appears to sent from UA9UIZ which means that I should have received it directly from UA9UIZ. This is very, very unlikely as UA9UIZ is located some 4500 km from here according to http://da.aprs.fi/?call=UA9UIZ.
Have any of you observed something similar?
Best 73 de Bent/OZ6BL On behalf of OZ7SAT
On 2010-01-03 14:42, Mark L. Hammond wrote:
Do you at least share the footprint with the other station?
Yes. We had a 2 deg elevation and the satellite was about midway between OZ7SAT and UA9UAZ over the Kola peninsula.
I suspect that the operator had the PL tone ON so his packets were being repeated through the FM repeater. I think that would make the packet look like it came directly to your station, without a path.
That sounds like a very plausible explanation.
I understand that packet operators should turn their PL tone OFF in order to prevent this.
Agree.
Congratulations to Nader for uploading three messages successfully! I am interested in his Wisp/MSPE TNC settings. For example, what the Retries time was set to, TxDelay, etc.
For what it is worth, here are the settings we use. You have to be rather aggressive when connecting to a satellite, so the T1 timer is set very low:
Window size: 1 T1: 0.5 sec Retry count 10 Maximum packet length. 128
The latter is probably not necessary with HO-68, but it was with GO-32.
Best 73 de Bent/OZ6BL
participants (2)
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Bent, OZ6BL -
Mark L. Hammond