Date: Tue, 10 Aug 93 04:30:04 PDT
From: Advanced Amateur Radio Networking Group <tcp-group@ucsd.edu>
Errors-To: TCP-Group-Errors@UCSD.Edu
Reply-To: TCP-Group@UCSD.Edu
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Subject: TCP-Group Digest V93 #204
To: tcp-group-digest
TCP-Group Digest Tue, 10 Aug 93 Volume 93 : Issue 204
Today's Topics:
PE1CHL versions?
Radio's on 9600
wg7j code (2 msgs)
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Date: Mon, 9 Aug 93 11:44:26 MST
From: dlf@phx.mcd.mot.com (Dave Fritsche)
Subject: PE1CHL versions?
To: tcp-group@ucsd.edu
Howdy,
I would love to put my hands on a recent version of PE1CHL NET for the
IBM-PC. On UCSD.EDU, in the tcpip/incoming directory, there is a set
of files for 930411. Within the 930411.tar file, there is a NET.ZIP
file. That particular file appears to be bad, and won't 'unzip'.
Also, the 'readme.1st' file is zero length. It kind of looks like the
'tar' file is bad. Can't figure out who uploaded it there, so can't
request a fresh copy by e-mail.
If anyone has a pointer to where I could get a fairly recent version
for the PC, I'd certainly appreciate it. I'd also like to get source
as well.
Thanks & 73 . . . Dave Fritsche (wb8zxu)
dlf@phx.mcd.mot.com (Tempe, AZ)
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Date: Mon, 9 Aug 93 11:19:48 PDT
From: Glenn Elmore <glenne@hpsadl3.sr.hp.com>
Subject: Radio's on 9600
To: TCP-Group@UCSD.EDU
> From: ve3mmn@ve3mmn.ampr.org
> Subject: Radio's on 9600
>
> Hi guys. I have just subscribed to this newsgroup and have been following
> the hardware discussions regarding radios on 9600 baud and have a few items
> to add.
> in the radio. The filters that are used are available from A & A engineering,
> they are 30 KHz wide 10.7 MHz crystal filters and are about $12 apiece. When
> the radio was aligned using a sweeper and the IF test point in the radio,
> using somewhat qualitative measurements seemed to indicate that the radio had
> a completely flat IF passband of about 27 KHz (3 dB points even wider). When
> I say flat, I mean you could use it for a *ruler* :-)
Thanks for the datapoint, Dave. If you can include contact information
for A & A, I'll buy a couple, build them up, optimize the matching and
verify group delay and flatness. Unless someone has an extra pair
sitting on the shelf that they want to send me...
We really shouldn't need a "sweet spot" that wide but considering
frequency tolerances etc something considerably more than 13 KHz is in
order I think. I suspect that 20 KHz should be a minimum.
Anyone else have a source of inexpensive, wider crystal filters? How
about 455 KHz ceramic filters? If I'm to build up a "generic digital
IF" it needs to be from readily available parts. I'm not interested in
kitting anything so I guess a common reliable source for both is needed
if it's to be duplicated.
I'd be interested in hearing quantitative reports of 9600 modifications.
Specifically, on a link with adequate C/N, how often does the BER test
point indicate a bit error?
I'd also be interested to know whether anyone has experimented with
circular polarization in an effort to mitigate multipath and reflections?
No one has asked me to move this discussion to hs-modem yet, but I will
if you like.
Glenn n6gn
------------------------------
Date: Mon, 9 Aug 93 09:59:39 EDT
From: n4clh@vnet.IBM.COM
Subject: wg7j code
To: TCP-Group@UCSD.Edu
has anyone been able to hit wg7j.ece.orst.edu lately? I have been keeping up
with Johans updates, but last two weeks or so its been unreachable.
I am running 110x9 with good results.
73,
=> Bob - N4CLH @ WA4BRO.ATL.GA.USA.NA
=> amprnet - 44.36.0.120 (n4clh.ampr.org) Atlanta, GA.
=> internet - rwaustin@atlvm1.vnet.ibm.com
------------------------------
Date: Mon, 9 Aug 93 11:55:41 -0400
From: Jim De Arras <jmd@cube.handheld.com>
Subject: wg7j code
To: n4clh@vnet.IBM.COM
>
> has anyone been able to hit wg7j.ece.orst.edu lately? I have been keeping up
> with Johans updates, but last two weeks or so its been unreachable.
> I am running 110x9 with good results.
>
> 73,
> => Bob - N4CLH @ WA4BRO.ATL.GA.USA.NA
> => amprnet - 44.36.0.120 (n4clh.ampr.org) Atlanta, GA.
> => internet - rwaustin@atlvm1.vnet.ibm.com
>
>
If you get anywhere, lemme know! I'm preparing to scrap the
WA7MBL/DV/G8BPQ/NOS nightmare I run here, and go pure wg7j. Where are the
latest, stable, bits?
Jim
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End of TCP-Group Digest V93 #204
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