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ZL3AI > APRDIG 10.07.03 09:14l 236 Lines 8956 Bytes #999 (0) @ WW
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: NMO mount GPS (not just antenna) ???
From: Richard Garcia <k4gps@bellsouth.net>
Date: 07 Jul 2003 14:50:29 -0400
X-Message-Number: 10
Are they actually NMO mount or NMO looking?
Rich
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Subject: Re: NMO mount GPS (not just antenna) ???
From: wes@johnston.net
Date: Mon, 07 Jul 2003 14:55:51 -0400 (EDT)
X-Message-Number: 11
Right from wes.johnston.net/aprs GPS section.... <grin>
NMO GPS antenna
Antenex NMO-mount GPS "pucks" that have been working successfully for ~4
years each. They're active (~26dBi if I recall), black, and about 4"
diameter by 2" high. Last time I checked, they were around
[commercial content deleted]
Panel Mount GPSThis GPS antenna mounts in a single hole
http://www.tri-m.com/products/systems/smartskymaster.html $xxx
Wes
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Subject: Re: NMO mount GPS (not just antenna) ???
From: James Jefferson <jj@aprsworld.net>
Date: Mon, 7 Jul 2003 14:06:09 -0500
X-Message-Number: 12
And major kudos to Wes for the link!
I was being stupid when I said NMO mount. Basically it was a stud mount
that I was looking for.
Now, does anybody have any experience with the "Smart Skymaster Hard Mount
GPS"? On their website (see link below) it is listed as an antenna, but it
definitely looks like a complete GPS.
Thanks,
-Jim
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Subject: Re: NMO mount GPS (not just antenna) ???
From: Richard Garcia <k4gps@bellsouth.net>
Date: 07 Jul 2003 15:09:18 -0400
X-Message-Number: 13
The Larsen (in black or white) from Tessco for "D" pricing is at about
$xx. I have one on my truck and it works GREAT! Larsen is the cheapest
you will find, I do not care for their 2-way antennas anymore but the
GPS antenna is fine.
Rich
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Subject: Re: NMO mount GPS (not just antenna) ???
From: WA8LMF2@aol.com
Date: Mon, 7 Jul 2003 15:25:59 EDT
X-Message-Number: 14
In a message dated 7/7/2003 11:39:26 AM Pacific Daylight Time,
jj@aprsworld.net writes:
>There are quite a number of NMO mount GPS antennas, but are there any
>complete
> GPSs?
YES! The Tri_M Systems "Smart Skymaster" is exactly this. It isn't
exactly NMO mount since you need at least THREE contacts (common/ground, DC
power in and serial data out) but comes very close This device, the
size of a typical 2" dia round antenna patch is a complete GPS system.
Drill or punch a 7/8" diameter hole in the roof or rear deck of a vehicle
and insert the threaded stud extending from the bottom of this device
through it. Spin a mating plastic wingnut onto the stud from below and you
are done.
A 8-pin Mini-DIN connector in the center of the stud mates with a 14-foot
cable. The other end of this cable has the forked DB9 RS-232 connector/
Mini-DIN 6 PS/2 connector pair found on many mouse-type GPS units. You
provide +5 VDC into the Mini-DIN6 from a laptop mouse/keyboard jack.
Standard NMEA 2.2 4800 baud 8-N-1 RS-232 data automatically starts coming
out of the DB9. A cigarette-lighter plug 12VDC-to-5 VDC regulator/adapter
is provided as an accessory.
I have had one of these hard mounted on the roof just in front of the
tailgate of my Passat TDI wagon. I have it connected to a very small
Astrodyne isolated 12 VDC-to-5-VDC switching power converter that is in
turn hardwired to my car's electrical system. The total drain at 12 VDC is
only about 55-60 mA and has been on 24/7 for almost three years now.
A pic of the installation is on my website at:
http://members.aol.com/wa8lmf/GPSAntennaFarm.jpg
This unit is made by a Taiwan company called San Jose Navigation. Their
webpage for this device is at:
http://www.sanav.com/gps_receivers/gm-44.htm
[commercial content deleted]
Stephen H. Smith wa8lmf (at) aol.com
Home Page: http://wa8lmf.com
Ham Radio/Mobile SSTV page: http://members.aol.com/wa8lmf/ham
APRS Stuff
http://members.aol.com/wa8lmf/aprs
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Subject: Re: NMO mount GPS (not just antenna) ???
From: "Curt Mills, WE7U" <hacker@tc.fluke.com>
Date: Mon, 7 Jul 2003 12:36:53 -0700 (PDT)
X-Message-Number: 15
On 7 Jul 2003, Richard Garcia wrote:
>Are they actually NMO mount or NMO looking?
Sorry, was in a hurry and missed the "NMO" part on first read.
You're right, they're not NMO. They have a base available that will
mount on a stud though.
They provide four (or more) wires, nmea-in, nmea-out, power, ground.
Some of the models also provide high-res timing (1 sec), and another
separate serial interface that can be used for DGPS in and other
things as I recall.
--
Curt Mills, WE7U hacker_NO_SPAM_@tc.fluke.com
Senior Methods Engineer/SysAdmin
"Lotto: A tax on people who are bad at math!"
"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: NMO mount GPS (not just antenna) ???
From: "tvsjr@sprynet.com" <tvsjr@sprynet.com>
Date: Mon, 7 Jul 2003 15:42:09 -0500 (CDT)
X-Message-Number: 16
Please keep in mind that an NMO mount uses a 3/4" diameter hole, whereas
this GPS uses a 7/8". If you install one of these and want to put an NMO
hole mount in later, you'll be sunk.
I would also be a little concerned about the depth of the GPS in the
headliner (with the Mini-DIN connector, wing nut, etc.) I know that,
especially with the rear air ductwork above the headliner in my Expedition,
there is very little clearance (at times barely enough for NMO mounts).
73,
Terry/N5RSE
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Subject: Re: NMO mount GPS (not just antenna) ???
From: "Scott Miller" <scott@opentrac.org>
Date: Mon, 7 Jul 2003 13:25:58 -0700
X-Message-Number: 17
I've been thinking about my idea off-road vehicle (my Honda Accord just
isn't cutting it) and I'm probably going to go with an older Suburban that I
won't feel bad about drilling lots of holes in. The GPS-35 or something
similar looks like a good option for GPS - I'd rather keep the receiver
right there at the antenna than worry about feedline loss - but what are
some good options for map displays that require less than a full sized
laptop for use with an external GPS? I'm thinking of something like a color
PDA or maybe an old laptop that can be connected to a smaller in-dash VGA
panel. I haven't used any PDA-based APRS software. Is there anything that
does APRS as well as good street maps? For the laptop option I'd probably
go with Xastir, though it really isn't as capable as Street Atlas for pure
navigation.
Suggestions, anyone? I'm probably also going to have an auxilliary power
system with one or more big deep-cycle batteries and a decent size solar
panel on the roof - if anyone's got information on good ways to set that up,
I'd love to hear it.
Scott
N1VG
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Subject: Re: NMO mount GPS (not just antenna) ???
From: David VanHorn <dvanhorn@cedar.net>
Date: Mon, 07 Jul 2003 15:38:48 -0500
X-Message-Number: 18
>Suggestions, anyone? I'm probably also going to have an auxilliary power
>system with one or more big deep-cycle batteries and a decent size solar
>panel on the roof - if anyone's got information on good ways to set that up,
>I'd love to hear it.
I'm using a Toshiba Libretto L-1, until I figure out something more robust.
Mike's palm APRS on a palm III-C is pretty good, but of course maps are
limited.
I'm running an auxilliary battery, but haven't got the charging system to
where I want it. I need to get some time to proto a boost reg that will
charge the gel cells, and shut down at about 12.5V so as to take the load
off the vehicle battery automatically, and just run on the deep-cycles.
I considered solar, but skywarn and solar panels are sort of mutually
exclusive. It's a Hail-ish environment for glass!
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Subject: Re: Tri-M hard mount GPS (not just antenna) ???
From: WA8LMF2@aol.com
Date: Mon, 7 Jul 2003 16:39:48 EDT
X-Message-Number: 19
Just measured the clearance under the roof for the SanNav/Tri-M antenna/GPS
RX. The supplied 8-pin MiniDIN cable has a right-angle plug on it.
The total clearance required for the device is just under 1" at the center
(barrel of miniDIN plug) and 3/4" at two points at the outside side of the
2" dia round footprint for the wings of the plastic wingnut (I have sawed
these off for a clearance at the outside of the footprintof only about 1/2").
---
END OF DIGEST
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