Date: Sat, 17 Jul 93 04:30:08 PDT
From: Advanced Amateur Radio Networking Group <tcp-group@ucsd.edu>
Errors-To: TCP-Group-Errors@UCSD.Edu
Reply-To: TCP-Group@UCSD.Edu
Precedence: Bulk
Subject: TCP-Group Digest V93 #183
To: tcp-group-digest
TCP-Group Digest Sat, 17 Jul 93 Volume 93 : Issue 183
Today's Topics:
9600 Experiances
DAMA code for WNOS
Question JNOS nos
TheNet X1H has no ICMP checksum???
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Date: Sat, 17 Jul 1993 00:41:05 -0500 (CDT)
From: Mr. Sampson <ssampson@sabea-oc.af.mil>
Subject: 9600 Experiances
To: TCP-Group@UCSD.Edu
Swinging to the hardware side for a moment...
I've recently been experimenting with 2 meter FM 9600 (have a
lot of experiance with a Tekk on 440) and am amazed at how
poorly it performs. I modified an ICOM 228A both to keep the
receiver on all the time (it shuts it off during transmit as
designed) and the normal VCO and Discriminator taps. After
discussing it, I'm pretty much convinced that the final IF
filter is the culprit. I'm using a PacComm TNC which has a
5 kHz cut-off on its input filter.
My theory is that 4800 Hz is the highest modulating frequency,
so the modulation index at 3 kHz deviation would be .625. Using
a Bessel chart shows +/- 3 sidebands for (6 x 4800) 28.8 kHz
Bandwidth. I assume the FIR filter on transmit greatly
attenuates the third sideband so we probably only need (4 x
4800) or 19.2 kHz.
The trouble is my ICOM (and most other rigs) has a 455 kHz filter
marked with an 'E'. PacComm says an 'E' is 15 kHz and a 'D' is
20 kHz. I'm not sure what the 10.7 MHz IF has in it. What's the
general consensus on this? Do those running 9600 sucessfully change
these out, or is my math all wrong?
---
Steve N5OWK
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Date: Fri, 16 Jul 93 15:42:59 CET
From: BARRY TITMARSH <BTITMARS%ESOC.BITNET@vm.gmd.de>
Subject: DAMA code for WNOS
To: TCP-GROUP <TCP-GROUP@ucsd.edu>,
Any one have mods for WNOS to add DAMA code to the ax25 front end.
code or comments to me, Or via the group - wnos-grp@esoc.bitnet
Thanks.
Barry
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Date: Fri, 16 Jul 93 17:49:56 CET
From: BARRY TITMARSH <BTITMARS%ESOC.BITNET@vm.gmd.de>
Subject: Question JNOS nos
To: TCP-GROUP <TCP-GROUP@ucsd.edu>,
Is Jnos capable of ax25 auto-routeing like wampes and Wnos ??
Im just looking at other nos's and Im reluctant to give up useing code
without the Auto-routeing in ax25.
Is there any other code ??
I am a happy Wnos user, but looking at Jnos.! and seeing Static ax25 routeing!
is there anything else.?
Barry
Comments to: wnos-grp@esoc.bitnet or btitmars@esoc.bitnet Thanks.
------------------------------
Date: Fri, 16 Jul 93 16:15 MDT
From: tech@cs.athabascau.ca (Richard Loken)
Subject: TheNet X1H has no ICMP checksum???
To: davis@realtime.ab.ca
So how come there are only six of us and two are named Davis?
We the undersigned in Athabasca only buy packet gear, we never use it. I kid
you not. Ross and I always have it on the list but never get there. Truth
be, whenever I have time or money for amateur radio, I spend it on HF CW.
As for TheNet, I know nothing. Wasn't there a similar piece of software out
there at one time?
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End of TCP-Group Digest V93 #183
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