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PA2AGA > TCPDIG 26.09.96 16:34l 139 Lines 5043 Bytes #-10874 (0) @ EU
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Date: Mon, 23 Sep 96 10:38:58 MET
Message-Id: <tcp_96_195>
From: pa2aga
To: tcp_broadcast@pa2aga-10
Subject: TCP-Group Digest 96/195
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TCP-Group Digest Thu, 19 Sep 96 Volume 96 : Issue 195
Today's Topics:
ETHERAX25
higher speeds, coding etc..
higher speeds and band choice
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We trust that readers are intelligent enough to realize that all text
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----------------------------------------------------------------------
Date: Wed, 18 Sep 96 00:24:40 mst
From: kc7hgn@uugate.wa7slg.ampr.org
Subject: ETHERAX25
Thank you for reading this message. I have a question on the Etherax25
driver for use with Winsock. When I run Winsock with the Etherax25 driver
along with my TNC in kiss mode, my system kicks me out to the DOS prompt
whenever the local gateway transmits is Netrom broadcast. I have tried
different programs but I have noticed it with all. Mainly I use Netscape 2.0
ans 3.0 gold Beta, along with Winsock, Etherax25 as the driver, and Winpkt
as the shim between them.
Any Ideas?
73's and thanks de Kevin.
kc7hgn@kc7hgn.ampr.org
boz@www.kc7hgn.ampr.org
------------------------------
Date: Wed, 18 Sep 1996 00:12:39 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: higher speeds, coding etc..
John,
Tell me more about your PSK radios. Ideally what I'd like to have is a
simple BPSK modulator on the transmit side (nothing fancy - can be a
double balanced mixer on an IF or RF line) and a fast digital sample
stream from an A/D converter on the receive side. A D/A port to control
overall RX gain would be nice too.
I'll do everything else -- filtering, demodulation, decoding and link
level protocols -- in software using the Pentium's floating point
unit. All I need is the proper high speed interface to a host
computer. Ideally this would be Ethernet, but it could also be a
parallel data cable going into a custom PC adapter card with some
FIFOs.
The Pentium is already a highly respectable DSP chip, and the new MMX
stuff will make it even better. I figure I should be able to Viterbi
decode at several megabits with a Pentium Pro without too much
trouble. This is faster than some of the dedicated chips we sell!
I'm a big proponent of the "do it in software if you can" approach in
amateur radio. This lets us make the most of our limited hardware
production resources.
The beautiful thing about software is how easily one
suitably motivated person can write and distribute it on the net to
the whole world -- or "launch" it into a satellite that's already in
orbit. It's like having a Star Trek transporter and replicator at your
fingertips for almost nothing, but it only works for bits. :-)
Phil
------------------------------
Date: Wed, 18 Sep 1996 07:15:35 -0800 (PDT)
From: Glenn Elmore <glenne@hpsadr2.sr.hp.com>
Subject: higher speeds and band choice
John vk3zjf wrote:
>
> Of course all of this begs the question of wether we should be contemplating
> the implementation of higher speeds on 2 metres. Surely two metres is
> overcrowded in most parts of the world, especially in Europe and Asia with
> often only a 2 MHz wide band. Application of a bit of basic technology at 23
> and 13cm would seem far more promising. Keep away from GMSK with all its
> attendant complications and go for a simple scheme which needs only simple
> radio equipment.
My use of 144 MHz in the previous link numbers was purely to give an
example to which others here might easily relate which would demonstrate
how much link C/N amateurs often lose.
The hardware I'm presently working on (though rather slowly lately) is
DSSS and centered on 1265 MHz. It is easily adaptable to other amateur
upper-UHF and low microwave bands. I'm not even considering anything
lower than 900 MHz.
I hear your warning WRT GMSK...
Glenn n6gn
------------------------------
End of TCP-Group Digest V96 #195
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