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To : HDDIG@EU
Date: Tue, 19 Sep 00 20:17:22 MET
Message-Id: <hd_2000_256A>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
Ham-Digital Digest Tue, 19 Sep 2000 Volume 2000 : Issue 256
Today's Topics:
Auctions are like Pawn Shops, was: Beware of W4WWB
cancel <39C623BB.A26B6DC8@source.net> (2 msgs)
Digital Repeater (2 msgs)
FA: TR-9000 All Mode 2M Transceiver
Final Update - DCC Orlando, FL Sep 22-24, 2000
MURS equipment certification (was Re: TCP/IP Address)
packet
Rigblaster for 706 MK II
Software for Packet
TCP/IP Address (10 msgs)
TCP/IP Address 2 (5 msgs)
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
Send subscription requests to: <Ham-Digital-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Digital Digest are available
(by FTP only) from ftp.UCSD.Edu in directory "mailarchives/ham-digital".
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.
Loop-Detect: Ham-Digital:2000/256
----------------------------------------------------------------------
Date: Mon, 18 Sep 2000 15:17:32 GMT
From: "Kenn" <kgeiger10@home.com.stuff.to.respond.remove.stuff>
Subject: Auctions are like Pawn Shops, was: Beware of W4WWB
Makes you feel good to put other people down??? Try seeking psychological
help. All you have succeeded in doing is proving that Charles is correct in
his statement.
73, Kenn
"Charles Brabham" <n5pvl@swb.net> wrote in message
news:N7fx5.1635$Yu5.126795@nnrp2.sbc.net...
>
> Oh, you must be new... Steve is a worthless jerk. I thought everybody knew
> THAT!
>
> --
> 73 DE Charles Brabham, N5PVL
------------------------------
Date: Mon, 18 Sep 2000 08:14:21 -0700
From: "Dana H. Myers" <dana@source.net>
Subject: cancel <39C623BB.A26B6DC8@source.net>
This message was cancelled from within Mozilla.
------------------------------
Date: Mon, 18 Sep 2000 08:54:55 -0700
From: "Dana H. Myers K6JQ" <Dana@Source.Net>
Subject: cancel <39C623BB.A26B6DC8@source.net>
This message was cancelled from within Mozilla.
------------------------------
Date: Mon, 18 Sep 2000 22:15:25 -0500
From: "Steve Sampson \(K5OKC\)" <ssampson@nospam.radio-link.net>
Subject: Digital Repeater
One of the projects I am working on (I just received a repeater freq
coordinated as a digital one) is to build a digital repeater.
What is a digital repeater?
Rather than FM voice modulation, the voice is sent through a CODEC
(A/D, D/A) and then through a vocoder to a digital compressed form.
The vocoder quality has been improving, and is now at the point
where users consider "good enough" at low baud rates. The current
vocoder by DVSI (www.dvsinc.com) operates from 2000 to 9600 bps,
with toll quality (phone/radio) at 4000 bps. Not only that, the vocoder
has FEC available. For example, a voice rate of 4000 bps can be selected
and 800 bps of FEC selected to provide a 4800 bps signal to the
transmitter. I've selected 4800 as a candidate, because it is about the
highest speed a voice channel can accept before internal modifications
are required. I've selected Linux, because it offers experimentation
at the least cost. Those with Microsoft subscriptions could easily
go the same way with a Windows or Windows CE platform.
What good is this?
Digital voice that can be routed over IP offers enormous potential.
Standard radio parts can be interfaced to a Linux box using a
Soundcard to encode and decode the 4000 bps signal (4800 with
FEC) and control the repeater through a Web interface. Once the
digital voice is sent over IP, anything (linking) is possible.
Voice and data can be combined. The radio design offers a capability
to use data to best effect. A small GPS engine can be combined with
Callsign or other messages to be viewed in a small LCD window.
No need to identify every 10 minutes, you identify every transmission!
This also provides a very intelligent squelch! Don't like to listen to
Jimbo on his way to work every morning? Put him in your killfile and
the radio stays quiet... A repeater could easily show who is in range,
if radios sent out APRS type packets with their callsign and position.
OK, I'm dreaming (nightmare), but you get the idea...
What kind of experiences have people had with 4800 bps with
typical Ham radios?
Best Regards,
Steve/k5okc
------------------------------
Date: Tue, 19 Sep 2000 10:58:16 +0100
From: Charles Brain <chbrain@remove.me.dircon.co.uk>
Subject: Digital Repeater
"Steve Sampson (K5OKC)" wrote:
>
> What kind of experiences have people had with 4800 bps with
> typical Ham radios?
I assume you mean GMSK ?
I have had reasonably good results using PI/4 offset DQPSK to
transmit digital voice using a FT290R 2m SSB radio, that was
at 3600 bps, 2400 voice - 1200 FEC. Best DX so far was 70 Km
over an obstructed path and flat conditions.
You can run those AMBE chips at 1/2 their lowest datarate by
throwing away every other frame on transmit and feeding each frame
in twice on receive. The speech quality is not bad at 1200 bps, but
at 600 bps it is awful.
- Charles
------------------------------
Date: Mon, 18 Sep 2000 22:29:04 -0400
From: "Chuck Wyatt" <cwyatt@webmaster.solidworks.com>
Subject: FA: TR-9000 All Mode 2M Transceiver
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=441378461
Low reserve. Bidding started at $90.
eBay auction of 2 Meter All Mode rig (covers 144-148 Mhz). Good to very
good condx. MC-46 Tone/VFO mic included. It's great for autopatch, and
you can QSY right from the mic.
This is a mobile unit, and will, of course, require a power supply for base
operation.
Thanks & 73,
Chuck
KB5GC
------------------------------
Date: Mon, 18 Sep 2000 20:16:29 GMT
From: srbible@gate.net (Steven R. Bible)
Subject: Final Update - DCC Orlando, FL Sep 22-24, 2000
19th Annual ARRL/TAPR Digital Communications Conference
Orlando, FL - September 22-24, 2000
** Final Update 9/18/2000 **
Counting down the final days until the 19th Annual ARRL/TAPR Digital
Communications Conference this weekend in Orlando, Florida. For
detailed
information about the conference, please visit the official DCC web
page at
http:www.tapr.org/dcc.
Registration for the conference will be taken at the door. Friday
registration is for an entire afternoon APRS activities,
demonstrations, and
presentations. Saturday registration includes conference proceedings,
lunch, and a full day of presentations. Saturday night includes
Banquet,
dinner speaker, and prize drawing. Sunday registration is for the
PICmicro
Design seminar.
DCC Social:
Please join us Friday evening at 7:00 PM for a social get together
time.
The social is generously hosted by the Packet Radio Users Group of
Japan
(PRUG).
PRUG Presentation:
Friday night the Packet Radio Users Group of Japan will present talks
on
their progress on high-speed digital networks in Japan.
Saturday Night Banquet Speaker:
Mr. Doug Campbell, of Triton Network Systems
(http://www.triton-network.com)
will be our DCC Banquet Speaker. Triton Network Systems is located in
Orlando, Florida.
Vice President Product Management, Marketing, & International Business
as
Vice President of International Sales, Marketing and Product
Management, Mr.
Campbell leads the assessment of global community needs and spearheads
To be continued in digest: hd_2000_256B
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