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ZL3AI > APRDIG 16.01.07 07:35l 271 Lines 7758 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 31 #16, 1/1
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. GPS from Sprint data card (Earl Needham)
2. Re: GPS from Sprint data card (Stephen H. Smith)
3. Re: GPS from Sprint data card (Earl Needham)
4. 2M 1/4 Wave antenna (Andrew Rich)
5. Re: 2M 1/4 Wave antenna (Ray Wells)
6. RE: 2M 1/4 Wave antenna (Andrew Rich)
7. Agw tracker and Agw packet engine (flknbry)
8. RE: GPS from Sprint data card (Scott Miller)
----------------------------------------------------------------------
Message: 1
Date: Sat, 13 Jan 2007 23:24:54 -0700
From: Earl Needham <needhame1_at_plateautel.net>
Subject: [aprssig] GPS from Sprint data card
I have a Sprint data card that has GPS functions built-in. Below is the
output of the GPS section, and UI-View32 doesn't like it. Is there a way
to get UI-View32 to use this data?
$GPGGA,235947.0,5717.746771,N,05717.746771,E,0,32,99.9,1.0,M,,,,*39
$GPGGA,235947.0,5717.746771,N,05717.746771,E,0,32,99.9,1.0,M,,,,*39
Thanks,
Earl
KD5XB
Clovis, New Mexico DM84jk
http://groups.yahoo.com/group/cw_bugs
"Just say NO to DHL"
------------------------------
Message: 2
Date: Sat, 13 Jan 2007 22:38:57 -0800
From: "Stephen H. Smith" <wa8lmf2_at_aol.com>
Subject: Re: [aprssig] GPS from Sprint data card
needhame1_at_plateautel.net wrote:
>I have a Sprint data card that has GPS functions built-in.
>Below is the output of the GPS section, and UI-View32 doesn't like
>it. Is there a way to get UI-View32 to use this data?
>
>$GPGGA,235947.0,5717.746771,N,05717.746771,E,0,32,99.9,1.0,M,,,,*39
>$GPGGA,235947.0,5717.746771,N,05717.746771,E,0,32,99.9,1.0,M,,,,*39
>
>Thanks,
>Earl
That looks like a perfectly normal GPS data string. You're lucky it's not
some wierd proprietary binary format! You should be able to feed it into a
serial port separate from the one your TNC is using, and then set UIview to
use the port under "Setup, GPS Setup". I.E you will require TWO serial
ports (or USB-to-serial "dongles") on your PC -- one for the TNC and one
for the GPS.
Not sure which GPS "sentences" UI-View actually requires. Can you enable
$GPRMC and $GPGLL as well? (These two sentences are required to get speed
and altitude into an APRS posit.)
--
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: 3
Date: Sat, 13 Jan 2007 23:53:21 -0700
From: Earl Needham <needhame1_at_plateautel.net>
Subject: Re: [aprssig] GPS from Sprint data card
At 11:38 PM 1/13/2007, Stephen H. Smith wrote:
>That looks like a perfectly normal GPS data string. You're lucky
>it's not some wierd proprietary binary format! You should be able
>to feed it into a serial port separate from the one your TNC is
>using, and then set UIview to use the port under "Setup, GPS
>Setup". I.E you will require TWO serial ports (or USB-to-serial
>"dongles") on your PC -- one for the TNC and one for the GPS.
>
>Not sure which GPS "sentences" UI-View actually requires. Can you
>enable $GPRMC and $GPGLL as well? (These two sentences are required
>to get speed and altitude into an APRS posit.)
It appears I can either use the card for data, or use it for GPS, but not
both at the same time, even though it uses THREE DIFFERENT com ports! And
it only puts out the GGA string, and then at about 10-second intervals.
It's kinda strange.
UI-View32 did finally accept that data, but I was really hoping to use the
data card for both at the same time, and use just the laptop as an APRS
setup without any 2-meter rig at all. I guess I'll have to use a separate
GPS to get this scheme to work.
Thanks,
Earl
------------------------------
Message: 4
Date: Sun, 14 Jan 2007 18:44:54 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: [aprssig] 2M 1/4 Wave antenna
Searched for ages on google, looking for a 1/4 wave vhf calculation for
145.825 MHz
I remember that the 45 degree radials had to be a ratio longer or shorter
than the vertical element.
Assuming speed of light at 300
lambda = 300 / freq
lambda = 300 / 145.825 MHz
lambda = 2.05 M
1/4 lambda = 2.05 M / 4
1/4 Wave antenna = 0.5143 M
1/4 Wave antenna = 51.43 cm
Cheers
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA
------------------------------
Message: 5
Date: Sun, 14 Jan 2007 20:15:36 +1100
From: Ray Wells <vk2tv_at_exemail.com.au>
Subject: Re: [aprssig] 2M 1/4 Wave antenna
Andrew Rich wrote:
>Searched for ages on google, looking for a 1/4 wave vhf calculation
>for 145.825 MHz
>
>I remember that the 45 degree radials had to be a ratio longer or
>shorter than the vertical element.
>
>Assuming speed of light at 300
>
>lambda = 300 / freq
>lambda = 300 / 145.825 MHz
>lambda = 2.05 M
>1/4 lambda = 2.05 M / 4
>1/4 Wave antenna = 0.5143 M
>1/4 Wave antenna = 51.43 cm
That formula gives the free-space length. For a typical whip style element,
diameter about 2mm, you need to reduce the length to about 95% of the
free-space value.
The radials are typically 5% longer than the whip.
The reason for drooping the radials down at 45° is to raise the feedpoint
impedance to 50 ohms. With horizontal radials Zo is 37.5 ohms, but even
that value will still match quite well to 50 ohm coax.
At one stage many years ago, 37 ohm coax was used to feed whips on
vehicles. This was in the days of valve PA's so matching the tx to the
cable was as easy as an adjustment of the PA tuning and coupling.
Cheers... Ray
------------------------------
Message: 6
Date: Sun, 14 Jan 2007 19:25:16 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: RE: [aprssig] 2M 1/4 Wave antenna
So,
145.825 MHz 1/4 wave vertical antenna
Active element (vertical)
lambda = 300 / freq
lambda = 300 / 145.825 MHz
lambda = 2.05 M
1/4 lambda = 2.05 M / 4
1/4 Wave antenna = 0.5143 M
1/4 Wave antenna = 51.43 cm
95% of the free space value
= 0.95 x 51.43 cm
= 48.85 cm
Radials (45 degrees)
lambda = 300 / freq
lambda = 300 / 145.825 MHz
lambda = 2.05 M
1/4 lambda = 2.05 M / 4
1/4 Wave antenna = 0.5143 M
1/4 Wave antenna = 51.43 cm
95% of the free space value
= 0.95 x 51.43 cm
= 48.85 cm + 5%
= 48.85 cm + 2.4425 cm
= 51.29 cm
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net <mailto:vk4tec_at_tech-software.net>
web: http://www.tech-software.net
Brisbane AUSTRALIA
------------------------------
Message: 7
Date: Sun, 14 Jan 2007 10:24:43 -0600
From: "flknbry" <flknbry_at_netzero.net>
Subject: [aprssig] Agw tracker and Agw packet engine
Hi
I Have a laptop running Xp and a baycom BP-2 modem.I would like to utilize
the modem and laptop.Now i know i will need the Agw packet engine is it
tough to configure?.Also does the AGw tracker include the packet engine or
will it not work with the baycom modem?.
Quentin
------------------------------
Message: 8
Date: Sun, 14 Jan 2007 09:48:57 -0800
From: "Scott Miller" <scott_at_opentrac.org>
Subject: RE: [aprssig] GPS from Sprint data card
Earl,
That shows an invalid fix - the 0 after the E indicates that. Could be it
just hasn't locked on yet.
Scott
N1VG
>$GPGGA,235947.0,5717.746771,N,05717.746771,E,0,32,99.9,1.0,M,,,,*39
------------------------------
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