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ZL3AI > APRDIG 19.05.04 09:14l 228 Lines 9045 Bytes #999 (0) @ WW
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Trimble 6 Channel GPS board, need info please...
From: Doug Bade <dbade@clecom.com>
Date: Tue, 04 May 2004 11:41:16 -0400
X-Message-Number: 16
There is also a special version of TAPR Pic-E code for the SveeSix
CM3, which we modified for TTL and GPGGA instead of RS232 and GPRMC, which
is in the TAPR Pic-E archives...in case anyone else has them and wants to
play with them..
I also just proved that the chipset in the Trimble Placer 400 is
the Svee-Six-cm3 set, and flashed one from TAIP to NMEA using CM3 flash
code.. It is a test unit from another member of this group, who donated it
for the potential lobotomy, however the transplant was successful and it is
testing and tracking in my car quite nicely... now an NMEA GPGGA unit...
pretty slick as it has its own rs232 stuff already.... I am playing with
the second port to see if anything useful can be done with it...
We use any 20db+ gain 5v rated gps antenna with good success on
our trackers...
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Subject: Re: Trimble 6 Channel GPS board, need info please...
From: "Curt, WE7U" <archer@eskimo.com>
Date: Tue, 4 May 2004 08:55:57 -0700 (PDT)
X-Message-Number: 17
On Tue, 4 May 2004, Doug Bade wrote:
> I also just proved that the chipset in the Trimble Placer 400 is
>the Svee-Six-cm3 set, and flashed one from TAIP to NMEA using CM3 flash
>code.. It is a test unit from another member of this group, who donated it
>for the potential lobotomy, however the transplant was successful and it is
>testing and tracking in my car quite nicely... now an NMEA GPGGA unit...
>pretty slick as it has its own rs232 stuff already.... I am playing with
>the second port to see if anything useful can be done with it...
>
> We use any 20db+ gain 5v rated gps antenna with good success on
>our trackers...
Good info. I didn't remember the specific amount of gain required.
The TinyTrack/PocketTrackers parse the GPGGA sentence. For those that
don't know, the SV6 only puts out GPGGA and GPVTG sentences, not the GPRMC
sentence most people use, and puts out TTL voltage levels. You get
altitude with GPGGA but not the speed/course info that most GPS'es put out
in the GPRMC sentence. The GPVTG sentence has that info, but I don't any
tracker firmware parses that sentence.
The very first TT-1 firmware versions don't parse the GPGGA sentence but
the later TT-1's do. All of the TT-2 and TT-3 have it.
The TinyTrack/PocketTracker config programs for the later versions allow
you to invert the incoming GPS data, which allows you to hook up the SV6
directly using TTL levels, instead of adding a transister inverter or a
MAX232 chip between them as I had to do on my TT-1/TT-2. I think only the
TT-3 has the capability to invert that bit.
Summary: Hooking an SV6 to a TT-3 or pockettracker is very simple and
works. You just need to flash the SV6 to NMEA mode first. It has three
protocols that it can do, TAIP, TSIP, and NMEA. The only mode currently
usable for APRS purposes is NMEA.
Also: Some SV6's cannot be flashed to NMEA mode, and some have other
problems in their firmware. There are tables available that tell you which
ones are usable, or at least there used to be.
--
Curt, WE7U archer at eskimo dot com
Arlington, WA, USA 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!"
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Subject: Re: HF ALE
From: "Curt, WE7U" <archer@eskimo.com>
Date: Tue, 4 May 2004 09:09:41 -0700 (PDT)
X-Message-Number: 18
On Tue, 4 May 2004, Jack Cavanagh wrote:
> This whole things sounds a lot like the situation back in the early
>days of packet when the FCC did not permit transmission of ASCII data.
>Does anyone remember the Vancouver protocol?
Yep! VADCG I think. Something like that.
> Here is a thought for HF APRS: Use Pactor FEC. It allows the full
>ASCII character set; it is analogous to an unconnected packet; it is has
>some error correction and is about 10 times faster than PSK31 including
>QPSK31 which has FEC.
Doesn't Pactor necessitate special hardware because of the response times
needed between RX/TX? I think that drives the cost up quickly or the
average person. Are there cheaper/simpler alternatives now for Pactor
operation, like perhaps a Linux box with a soundcard and some real-time
additions to the OS?
--
Curt, WE7U archer at eskimo dot com
Arlington, WA, USA 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!"
----------------------------------------------------------------------
Subject: RE: HF ALE
From: "Eric H. Christensen" <kf4otn@earthlink.net>
Date: Tue, 4 May 2004 12:14:06 -0400
X-Message-Number: 19
Jack,
Is Army MARS using frequency selection too or just linking? It wouldn't be
difficult, but would be cumbersome, to try to use Software ALE to control
the HF radio, IMO. Motorola puts on a good show with the Micom(?) Series HF
radios with built-in ALE. Kinda pricy though. I'm not sure if their
Amateur Version had an ALE option or not.
Eric KF4OTN
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Subject: RE: HF ALE
From: "Robert Bruninga" <bruninga@usna.edu>
Date: Tue, 04 May 2004 13:16:25 -0400
X-Message-Number: 20
Sounds like a GREAT softare project for the
Kenwood TS-2000 rig...! Bob
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Subject: re: HF ALE - and better
From: "Bill Vodall WA7NWP" <wa7nwp@jnos.org>
Date: Tue, 4 May 2004 10:39:20 -0700
X-Message-Number: 21
> Here is a thought for HF APRS: Use Pactor FEC. It allows the full
>ASCII character set; it is analogous to an unconnected packet; it is has
>some error correction and is about 10 times faster than PSK31 including
>QPSK31 which has FEC.
>
>Jack/KB4XF/AAT3GZ
Use Q15X25 aka NewQPSK...
From: http://www.qsl.net/zl1bpu/Q15X25/Q15X25.html
---
Q15X25 is a 15 tone packet mode with a Kiss/AX25 interface, and from its
performance, should long ago have replaced conventional packet for HF use!
Q15X25 is now available for Motorola EVM, LINUX PC and Windows PC sound
card operation.
Q15X25 Described
In the true spirit of Amateur Radio, Q15X25, like MT63 and many other
Amateur designed communications modes, is an open protocol (full details
are disclosed) and uses open transmissions (can be read by anyone with
similar equipment). Anyone can design or adapt the open sourced software to
develop their own Q15X25 system. This is markedly in contrast to some
commercial HF packet-transfer systems.
Q15X25 is a DSP intensive mode that operates the like a TNC and modem, to
provide an ARQ mode designed for AX.25 and TCP/IP on HF with speed and
reliability much greater than traditional HF ARQ modems (such as 300 baud
packet). It uses 15 QPSK modulated carriers separated by 125 Hertz, each
modulated at 83.333 baud. Q15X25 uses FEC (Forward Error Correction), and
like MT63, uses time and the frequency interleaving in order to avoid most
error sources. The raw transmission data rate is typically 2500 bps.
---
One Puget Sound local tried it on two meters for his drive to and from
work. The terrain is challenging and he normally captured his mobile
packets for only the first half of the trip. That's using standard packet
at either 1200 or 9600 baud. One day he tried it running NEWQPSK with the
same equipment and power levels. Instead of packets from half the trip,
he captured packets from the entrie trip. A major improvement in
performance.
73,
Bill - WA7NWP
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Subject: RE: Long distance wireless APRS
From: "Bill Vodall WA7NWP" <wa7nwp@jnos.org>
Date: Tue, 4 May 2004 10:53:20 -0700
X-Message-Number: 22
>Subject: [aprssig] Long distance wireless APRS
>
>I live a mile and a quarter from work....
>
>I would like to network a computer at work so I don't have to buy another
>TNC,etc...
>
>I have not been into computer wireless till now...
>
>Can I just use 2 beams or do I need a power amp,etc... I think I have a
>line-of-sight path...
>
>Could you also point me to a hardware source...???
>
>Carl Taylor W9ZGU
>Hollywood, FL, ( Near Ft. Lauderdale...)
What's the path like? Major obstructions or fairly clear?
You could try a pair of Metricom Ricochet modems. Slower (100 kbits) then
the WiFi solutions mentioned but more power (1 watt spread specturm) and
much cheaper. Nothing currently on Ebay for single units -- but you should
be able to pick up a couple for $10 to $20 each.
73,
Bill - WA7NWP
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