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Packet Radio Digest - Volume 91, Number 99
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From wang!elf.wang.com!ucsd.edu!packet-radio-relay Tue Apr 23 13:44:56 1991 remote from tosspot
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Message-Id: <[email protected]>
Date: Tue, 23 Apr 91 04:30:09 PDT
From: Packet-Radio Mailing List and Newsgroup </dev/[email protected]>
Reply-To: [email protected]
Subject: Packet-Radio Digest V91 #99
To: [email protected]
Packet-Radio Digest Tue, 23 Apr 91 Volume 91 : Issue 99
Today's Topics:
How to make electronic antenna switches at 70cm?
HT with Packet
Send Replies or notes for publication to: <[email protected]>
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Problems you can't solve otherwise to [email protected].
Archives of past issues of the Packet-Radio Digest are available
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We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
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Date: 22 Apr 91 08:01:18 GMT
From: swrinde!zaphod.mps.ohio-state.edu!think.com!mintaka!bloom-beacon!eru!hagbard!sunic!mcsun!hp4nlate!philica!geertj@ucsd.edu
Subject: How to make electronic antenna switches at 70cm?
To: [email protected]
I'm building a transverter for 10m->70cm, to be used for the DSY-modems.
Transmit and receive seem OK now - haven't checked with an analyser yet -
but I have some problems getting the TX/RX antenna switch right.
Because it is going to be used for packet, I'm reluctant to use a
coax relay. So, I am looking into diode switches.
The amateur literature I have hardly mentions this area: transmitters
are described, receivers are described, but the integration of these
boxes usually isn't covered.
So, how to I keep my 25 Watts of RF out of the preamplifier stage?
I have looked into commercial designs, but most of them uses striplines
on PCB, which are hard to 'borrow'. Has anyone else struggled with this
problem? Somebody made a 70cm switch for 25W with kitchentable technology?
Tell me how you did it!
Thanks in advance!
73, Geert Jan PE1HZG
--8<--nip-nip---------------------------------------------------------------
"We trained hard - but it seemed that every time we were beginning to form up
into teams, we would be reorganized. It was to learn later in life that we tend
to meet any new situation by reorganizing, and a wonderful method it can be
for creating the illusion of progress while producing confusion, inefficiency,
and demoralisation." - Petronius, 100 BC
Geert Jan de Groot, Philips ICA, Weisshausstrasse 1, 5100 Aachen, Germany
Email: [email protected] or ..!hp4nl!philica!geertj
Phone: +49 241 6003 714 FAX: +49 241 6003 709
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Date: 22 Apr 91 15:29:25 GMT
From: swrinde!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!ducvax.auburn.edu!eng.auburn.edu!sd.edu
Subject: HT with Packet
To: [email protected]
I have a Yaesu FT470 HT. My question is this Can I use that HT for packet
work?
Brian Hartsfield
[email protected]
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Date: 22 Apr 91 13:47:19 GMT
From: usc!sdd.hp.com!caen!sol.ctr.columbia.edu!emory!wa4mei!ke4zv!gary@ucsd.edu
To: [email protected]
References <[email protected]>, <[email protected]>, <[email protected]>
Reply-To : [email protected] (Gary Coffman)
Subject : Re: Packet buzzwords
In article <[email protected]> [email protected] (Jeff Hayward) writes:
>
>In article <[email protected]> [email protected] (Gary Coffman) writes:
>>In article <[email protected]> [email protected] ( Robert Taggart) wr
>>>
>>[What are these buzzwords?]
>>
>>>1. TheNet
>>
>>A clone of Netrom written by a group of German hams. Source available.
>>Distribution free.
>
>Wrong.
No the information is correct. If you have a problem with trademark
infringement, talk to them. Also the Texnet folks. They've been using
those names for several years. They may have prior art on you. Or
they may not, I'm not an attorney. Regardless, those are the names
that they are using.
>Folks should be aware that THEnet(sm) is a registered service mark of
>the Board of Regents of the University of Texas, and may not be used
>without permission.
>
>It also happens that TEXnet (tm) is a trade mark of the Texas Business
>Network, Inc. I don't know who they are; I'm only affiliated with UT.
>
>--
>Jeff Hayward
>The University of Texas System +1 512 471 2444
>Office of Telecommunication Services [email protected].net
Gary KE4ZV
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End of Packet-Radio Digest
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