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ZL3AI > APRDIG 03.08.06 00:09l 232 Lines 8851 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 25 #26, 1/2
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From: ZL3AI@ZL2BAU.#87.NZL.OC
To : APRDIG@WW
Today's Topics:
1. Re: Mounting 2M Xcvr in '05 Toyota Camry (Steve Noskowicz)
2. Rigs and Cars (Ron)
3. Re: Mounting 2M Xcvr in '05 Toyota Camry (Joel Maslak)
4. RE: Palm III software (Curt Mills)
5. Re: OpenTracker !DAO! support and enhanced resolution (Ian ZL1VFO)
6. Re: Re: OpenTracker !DAO! support and enhanced resolution (Jason Winningham)
7. Re: Re: OpenTracker !DAO! support and enhanced resolution (Jason Winningham)
8. Re: using beacon text to advertise voice repeaters (Robert Bruninga)
9. Re: using beacon text to advertise voice repeaters (Wes Johnston, AI4PX)
10. RE: Mounting 2M Xcvr in '05 Toyota Camry (Robert Bruninga)
11. Re: using beacon text to advertise voice repeaters (Robert Bruninga)
12. RE: Mounting 2M Xcvr in '05 Toyota Camry (Dave Baxter)
13. RE: Mounting 2M Xcvr in '05 Toyota Camry (Bob Burns K4RXR)
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Message: 1
Date: Tue, 25 Jul 2006 14:48:35 -0700 (PDT)
From: Steve Noskowicz <noskosteve_at_yahoo.com>
Subject: Re: [aprssig] Mounting 2M Xcvr in '05 Toyota Camry
Matt & Vince,
It is interesting how much RF gets inside the passenger compartment. From
a test I ran, it is clear it is all from the antenna and not from RF
cables. Playing w/cables had little effect.
I had two identical Camrys ('02 & '03) except one had a sun roof. From low
to highest amount of RF in the passenger compartment (using a field
strength meter).
highest: 1/4 wave on trunk
1/4 or 5/8 on Roof were similar. 5/8 lower but probably not statistically
significant.
Lowest 5/8 on trunk
All mag mount. I did some dB estimates, but, alas, that data is lost to
history.
However, the surprise was that the sun roof version had LESS internal RF
than the non-sun roof for antennas on the roof. Perhaps the opening formed
some sort of slot. It was probably closer to a 1/4 than a 1/2 wave in the
longest dimension. I had the meter in several places, but focused on the
heads of driver & passengers. Yes there is an issue as to what the feed
line was doing with the mag mount. Oh yes, this was 2 meters. Wish I had
the cars now because I have access to a Holaday RF survey meter.
73, Steve, K9DCI
------------------------------
Message: 2
Date: Tue, 25 Jul 2006 18:03:32 -0400
From: "Ron" <rgilson_at_adelphia.net>
Subject: [aprssig] Rigs and Cars
I've been running transceivers in my cars since 1957 with 5 to 125 watts
output without any interference. Also worked for a two way shop and
installed lots of after market lighting, computers and transceivers without
trouble. One of my cars was receiving a signal on 146.940mhz when the
engine was running. In those days with only single channel receivers (I'm
really dating myself now) I had no choice but to "Pad" the car computer
clock with a 10 pf capacitor and still no problem in performance. Those
were the days that the car computers were poorly designed and leaked clock
all over the place. Good luck and let the group know what you decide and
the results.
Ron
WA2WWK
------------------------------
Message: 3
Date: Tue, 25 Jul 2006 16:29:07 -0600
From: Joel Maslak <jmaslak-aprs_at_antelope.net>
Subject: Re: [aprssig] Mounting 2M Xcvr in '05 Toyota Camry
On Jul 25, 2006, at 3:48 PM, Steve Noskowicz wrote:
>Yes there is an issue as to what the feed line was doing with the
>mag mount. Oh yes, this was 2 meters.
Good grounding of the antenna is a major factor in reducing in-car noise.
Magmounts are horrid for this.
I noticed a huge change in the amount of interference to my car's subwoofer
when I transmit just by properly installing an antenna. Going from an
on-glass antenna to a drilled mount on the trunk deck eliminated a whole
lot of interference - I can transmit 50 watts without problems, whereas
before with the on-glass antenna I could use only 10 watts. The ironic
thing - the trunk-mount antenna is several feet closer to the subwoofer!
(and the RFI was coming in directly from RF - I eliminated the subwoofer's
power and signal wires as ways of carrying in the RFI during testing).
Personally I'd take the risk, be a ham operator, and use good practice -
have a good quality antenna mount (with a hole!), good quality feed line,
and a properly matched antenna and 50 watts probably won't be a problem.
Heck, the state trooper driving past you may be transmitting in the 150 mhz
band with 100 watts, and may be a lot closer physically to your car's
computer than your own radio equipment is.
You'll also be surprised at how much better your radio works when it's done
the way professionals do it (look at how 2 way shops do installations - why
don't you see marked police cars with magmounts?)
------------------------------
Message: 4
Date: Mon, 24 Jul 2006 20:49:13 -0700 (PDT)
From: Curt Mills <archer_at_eskimo.com>
Subject: RE: [aprssig] Palm III software
On Mon, 24 Jul 2006, AC7YY wrote:
>If you don't find the files you are looking for, I have a pocketaprs.prc
>palm application file (270kb). I have a few local area maps (Western
>Washington), but those should be much more readily available.
I have some maps too. There are also European maps available on the
'net from Henk de Groot.
>As Curt mentioned this is an unsupported application :) so it can not be
>registered.
Your only other current option is SmartPalm, an open-source application for
PalmOS. It doesn't have (nor was intended to have) map capability. It's
more a software implementation of the HamHUD.
--
Curt, WE7U. archer at eskimo dot com
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, 26 Jul 2006 18:20:37 +1200
From: Ian ZL1VFO <zl1vfo_at_yahoo.co.uk>
Subject: [aprssig] Re: OpenTracker !DAO! support and enhanced resolution
>From: scott_at_opentrac.org [mailto:scott_at_opentrac.org]
>Sent: Tuesday, 25 July 2006 3:39 PM
>To: 'TAPR APRS Mailing List'
>Subject: [aprssig] OpenTracker !DAO! support and enhanced resolution
~ Snip ~
>Anyway, the firmware's available for download now, just hit the 'load
>firmware from web' button in the config program. Base91 will take advantage
>of the extra resolution automatically, but to turn on DAO you'll need to get
>the new config program at http://n1vg.net/opentracker/downloads.php. It
>adds a DAO checkbox on the right side, next to the compressed option. Yeah,
>the screen's getting crowded... I'm going to rework it as soon as I have
>time.
>Scott
>N1VG
Scott, if you are looking at reworking the config program, could you also
consider changing the .CFG file to something human-readable, perhaps even
XML or a <tag>=<value> format, so we can edit the file with notepad without
having to connect up the OT to a PC.
It might also make it easier to get around email systems that block
attachments, (*.CFG) as the config text could be included in the email
body.
It would probably be a good idea to keep the ability to read the original
.CFG file structure too, so one doesn't have to enter all the variables in
by hand again...
just a suggestion...
Cheers,
Ian ZL1VFO
------------------------------
Message: 6
Date: Wed, 26 Jul 2006 06:49:05 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] Re: OpenTracker !DAO! support and enhanced resolution
On Jul 26, 2006, at 1:20 AM, Ian ZL1VFO wrote:
>Scott, if you are looking at reworking the config program, could you
>also consider changing the.CFG file to something human-readable,
>perhaps even XML or a <tag>=<value> format, so we can edit the file
>with notepad without having to connect up the OT to a PC.
If he had to delete day/month parsing to get enough code space to do !DAO!,
I sort of doubt he can cram an XML parser into 12 or 14 free bytes. (: I
do like the idea of a plain text config file, though.
The T2, OTOH, is command line configurable _and_ over-the-air configurable.
Not XML, but the commands to configure can easily be saved as text.
-Jason
kg4wsv
------------------------------
Message: 7
Date: Wed, 26 Jul 2006 06:56:44 -0500
From: Jason Winningham <jdw_at_eng.uah.edu>
Subject: Re: [aprssig] Re: OpenTracker !DAO! support and enhanced resolution
>If he had to delete day/month parsing to get enough code space to
>do !DAO!, I sort of doubt he can cram an XML parser into 12 or 14
>free bytes. (:
Ugh, not enough caffeine; my "send" button should be disabled until I get
my morning dose. I thought my way through an OT config, and I think I just
figured out what you're talking about, which isn't implementing the parser
on the OT but in the config program, right?
-Jason
kg4wsv
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