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ZL3AI > APRDIG 17.11.06 08:35l 270 Lines 8713 Bytes #999 (0) @ WW
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To : APRDIG@WW
Today's Topics:
1. transceiver for APRS? (Chris Kantarjiev)
2. Re: transceiver for APRS? (Jason Winningham)
3. Re: transceiver for APRS? (Curt, WE7U)
4. xastir : xastir-development (Curt, WE7U)
5. Clueless Beacon on 30M HF (Stephen H. Smith)
6. Re: Opinions for a small ultra compact notebook PC? (A.J. Farmer (AJ3U))
7. Re: Clueless Beacon on 30M HF (Ben Jackson)
8. Re: Clueless Beacon on 30M HF (Stephen H. Smith)
9. Re: Re: Clueless Beacon on 30M HF (Ben Jackson)
10. Re: transceiver for APRS? (kc9umr_at_freqradio.com)
11. Re: transceiver for APRS? (Curt, WE7U)
12. Re: transceiver for APRS? (Jan T. Pharo)
13. Re: transceiver for APRS? (kc9umr_at_freqradio.com)
----------------------------------------------------------------------
Message: 1
Date: Wed, 15 Nov 2006 11:02:03 -0800 (PST)
From: Chris Kantarjiev <cak_at_dimebank.com>
Subject: [aprssig] transceiver for APRS?
A friend and I are thinking about design projects, and one that came up is
a transciever specifically for APRS - something like the Maxon data radios
of years past.
Aside from "almost free", what features would you want? The ones that came
immediately to mind were
- low idle current
- 9600 bps capable
- frequency agile (with some work, perhaps)
- no voice frequency pre-emphasis
What else? What power range?
------------------------------
Message: 2
Date: Wed, 15 Nov 2006 13:18:19 -0600
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] transceiver for APRS?
On Nov 15, 2006, at 1:02 PM, Chris Kantarjiev wrote:
>- frequency agile (with some work, perhaps)
change this to frequency agile (no qualifiers), and add computer controlled.
-Jason
kg4wsv
------------------------------
Message: 3
Date: Wed, 15 Nov 2006 12:23:54 -0800 (PST)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: Re: [aprssig] transceiver for APRS?
On Wed, 15 Nov 2006, Chris Kantarjiev wrote:
>Aside from "almost free", what features would you want? The ones
>that came immediately to mind were
>- low idle current
>- 9600 bps capable
>- frequency agile (with some work, perhaps)
>- no voice frequency pre-emphasis
Is that last requirement so that they're compatible with the Kenwoods and
very little else? Everything else out there is using
pre-emphasis/de-emphasis.
More:
- 5W-7W output
- Small, rugged, lightweight
- Frequency agile, computer controllable
- Discriminator tap to reduce mA on open-squelch receive
- Room inside case to add TNC board and batteries
- Room for GPS and computer connectors
I don't need 9600. Looking for rugged tranceivers (not just transmitters)
that would work for SAR. Portable. You didn't mention whether you were
thinking of a mobile or portable rig.
If capable of voice operation as well, then it'd be nice to either quiet
the RX audio to the speaker when packet comes across (for Mic-E operation),
or have the unit auto-switch to another frequency of choice to send the
posits.
Even better would be dual receiver so that you could receive/digipeat on
the APRS frequency plus receive audio on the voice frequency (or another
packet frequency). The transmitter could be frequency agile though so
you'd need only one there.
I know I'm dreaming on those last two, but you asked!
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
------------------------------
Message: 4
Date: Wed, 15 Nov 2006 13:54:03 -0800 (PST)
From: "Curt, WE7U" <archer_at_eskimo.com>
Subject: [aprssig] xastir : xastir-development
Announcements <aprsnews_at_lists.tapr.org>
Project: XASTIR (xastir)
Package: xastir-development
Date : 2006-11-15 06:51
Project "XASTIR" ('xastir') has released the new version of package
'xastir-development'. You can download it from SourceForge.net by following
this link:
or browse Release Notes and ChangeLog by visiting this link:
Homepage: <http://www.xastir.org>
--
Curt, WE7U. APRS Client Comparisons: http://www.eskimo.com/~archer
"Lotto: A tax on people who are bad at math." -- unknown
"Windows: Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me: I picked the coordinate system!"
------------------------------
Message: 5
Date: Wed, 15 Nov 2006 17:58:02 -0800
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: [aprssig] Clueless Beacon on 30M HF
I just monitored this from the Seattle,WA area on 30M HF from Pasadena, CA:
2:Fm WB7VLW To GPSLK Via RELAY,BALDI,MISION,MOXIE,WIDE3,GATE* <UI pid=F0
Len=70 >[17:47:12]
$GPGGA,214910,4706.8793,N,12215.5971,W,1,06,2.1,185.6,M,-18.8,M,,*73
Arrrrgh !!!
------------------------------
Message: 6
Date: Wed, 15 Nov 2006 21:29:27 -0500
From: "A.J. Farmer (AJ3U)" <farmer.aj_at_gmail.com>
Subject: Re: [aprssig] Opinions for a small ultra compact notebook PC?
On 11/15/06, Jack Chomley <radio_at_dodo.com.au> wrote:
>I am looking for a windoze O/S based notebook PC for my APRS and data comms
>station. Want to operate portable, reason for the small physical size.
>Have Toshiba E800 PDA, lack of a keyboard and decent software is a problem
>so its no good me using a PDA.
Search ebay for "Libretto".
--
A.J. Farmer, AJ3U
http://www.aj3u.com
------------------------------
Message: 7
Date: Wed, 15 Nov 2006 19:09:21 -0800
From: Ben Jackson <ben_at_ben.com>
Subject: Re: [aprssig] Clueless Beacon on 30M HF
On Wed, Nov 15, 2006 at 05:58:02PM -0800, Stephen H. Smith wrote:
>
>2:Fm WB7VLW To GPSLK Via RELAY,BALDI,MISION,MOXIE,WIDE3,GATE* <UI pid=F0
>Len=70 >[17:47:12]
>$GPGGA,214910,4706.8793,N,12215.5971,W,1,06,2.1,185.6,M,-18.8,M,,*73
Unless I misread that path, it was a 2m beacon gated onto 30m, probably
by W7CCY.
--
Ben Jackson AD7GD
http://www.ben.com/
------------------------------
Message: 8
Date: Wed, 15 Nov 2006 19:40:10 -0800
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: [aprssig] Re: Clueless Beacon on 30M HF
ben_at_ben.com wrote:
>On Wed, Nov 15, 2006 at 05:58:02PM -0800, Stephen H. Smith wrote:
>
>>2:Fm WB7VLW To GPSLK Via RELAY,BALDI,MISION,MOXIE,WIDE3,GATE* <UI pid=F0
>>Len=70 >[17:47:12]
>>$GPGGA,214910,4706.8793,N,12215.5971,W,1,06,2.1,185.6,M,-18.8,M,,*73
>>
>
>Unless I misread that path, it was a 2m beacon gated onto 30m, probably
>by W7CCY.
If that is so:
1) What is he doing gating VHF to HF? That's normally a no-no since
1200 baud VHF traffic has the capability to completely monopolize the
much slower 300 baud HF side. And, due to propagation on 10MHz, tie
up the 10.149 channel over at least HALF of the US and Canada doing it.
2) Why is he transmitting raw NMEA strings instead of compressed or
Mic-E packets. This string probably took over 15 seconds to send at 300
baud. It not only wastes the very limited channel capacity on HF, it
absolutely minimizes the chance of being successfully received.
ALL of a packet has to be received PERFECTLY before ANYTHING can be
recovered from it. This raw NMEA string that is TEN TIMES longer than
it needs to be simply to send a posit, absolutely maximizes the
probability of the packet being trashed by signal fading, a pop of noise
or other stations that can't hear him keying up on top of his transmission.
--
Stephen H. Smith wa8lmf (at) aol.com
EchoLink Node: 14400 [Think bottom of the 2M band]
Home Page: http://wa8lmf.com --OR-- http://wa8lmf.net
NEW! TNC Test CD
http://wa8lmf.net/TNCtest
JavAPRS Filter Port 14580 Guide
http://wa8lmf.net/aprs/JAVaprsFilters.htm
"APRS 101" Explanation of APRS Path Selection & Digipeating
http://wa8lmf.net/DigiPaths
Updated "Rev G" APRS http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:
------------------------------
Message: 9
Date: Wed, 15 Nov 2006 20:59:52 -0800
From: Ben Jackson <ben_at_ben.com>
Subject: Re: [aprssig] Re: Clueless Beacon on 30M HF
On Wed, Nov 15, 2006 at 07:40:10PM -0800, Stephen H. Smith wrote:
>
>1) What is he doing gating VHF to HF?
Well, it's probably someone who is confusing GATE and "IGate" and put GATE
in without realizing it meant HF. As to why the actual VHF-HF station is
doing it (instead of ignoring it), well, you'd have to find them. I'm
guessing about who it is based on my own 10m HF experiments.
>2) Why is he transmitting raw NMEA strings instead of compressed or
>Mic-E packets. This string probably took over 15 seconds to send at 300
>baud.
The original sender probably doesn't know he's going to HF at all.
--
Ben Jackson AD7GD
http://www.ben.com/
------------------------------
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