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ZL3AI > APRDIG 16.07.03 16:58l 77 Lines 2829 Bytes #999 (0) @ WW
BID : 1617-ZL3AI
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Subj: TAPR Digest, Jul 13, 4/4
Path: DB0FHN<DB0RGB<DB0MRW<OK0PKL<OK0PPL<RZ6HXA<SP7MGD<ON0BEL<VK7AX<ZL2BAU<
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: packet repeater?
From: "Ev Tupis (W2EV)" <w2ev@arrl.net>
Date: Sun, 13 Jul 2003 18:52:18 -0400
X-Message-Number: 30
Wes Johnston wrote:
>
>I was just thinking... what if we had a bit regenerating packet repeater
>with an input 3mhz away from 147.39 at 147.40 <=> 147.59? What sort of
>duplexer would be needed? Could I get away with 2 cavities instead of
>6? Yes, I know all the nay sayers and arm chair lawyers will pop up on
>this one.
K2AMB-3 (on 144.39 MHz) shares a common antenna with W2AAA-2 (on 147.585
MHz) using a 4-cavity filter out of a /\/\otorola business radio...quite
successfully. Learn about 50-ohm normalizing and double shielded cabling
before just tuning the filter up and using it.
Otherwise...all works well.
It allows APRS digipeater owners to co-locate a PropNET Hub with little
impact on APRS operation...while providing the PropNET service to their
area.
Ev, W2EV
----------------------------------------------------------------------
Subject: Re: 6M Packet Freq? 1200bps
From: "Ev Tupis (W2EV)" <w2ev@arrl.net>
Date: Sun, 13 Jul 2003 19:14:46 -0400
X-Message-Number: 31
>>Originally, it was 53.530 FM. All activity has now moved to 50.620 FM.
>My idea was to build a local functioning network and mine the
>resulting packets for band openings. In light of that I was going
>to crystal up (once again) my old IC-60 and try to get some
>local APRS/BBS/TCP packet activity going on 50.62. Now it's even
>more worthwhile to get on 50.62. We'll use the channel and be
>ready to catch DX packets when they show up.
We've used this year's Es season to find out just how compatible APRS is
with other more traditional connected modes on the same channel. It is
fine. :) We've logged a half-dozen backbones on this frequency (mostly in
Arkansas...but they're probably all over). No QRM reports all year (and
we've been there all season).
50.620 has the additional benefit of being a frequency that is already
"crystalled up" on a lot of transceivers in mothballs (it's the "national
packet calling frequency").
It's win-win...especially when we convince existing users of the frequency
to include PropNET frames in their normal operation...TXing once every 5 or
10 minutes.
Join us! We've even got our own AHub server and Jim Jefferson is building
a web interface to allow anyone anytime to take a gander at band
conditions.
>>Visit: http://www.PropNET.org for more information.
NOTE: do NOT just power-up and operate on 6-meters with your 2m APRS
configuration. The network is a little different there (because the
collision domain can be coast-to-coast). Read the info on the website. The
changes are trivial to implement...and quite important if you're going to
be a good channel user.
Ev, W2EV
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END OF DIGEST
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