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ZL3AI > APRDIG 30.11.03 22:41l 90 Lines 2915 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Nov 26, 3/3
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Digitraveler altitude limit?
From: Neil Johnson <njohnsn@njohnsn.com>
Date: Wed, 26 Nov 2003 20:10:55 -0600
X-Message-Number: 19
On Tuesday 25 November 2003 01:20 pm, J. Lance Cotton wrote:
>Scott Miller wrote:
>>Ok, I know someone's got a listing someplace of what GPS units have
>>trouble with altitudes greater than 64,000 feet, but I can't find it.
>>Can someone send me a link? Or at least tell me if the DigiTraveler
>>works to at least 100,000 feet?
>
>According to the specs of the Sony GXB2000 GPS chip datasheet (this is the
>engine of the Digitraveler) they lay out the format of the NMEA data, which
>specifies 4 digits for altitude, the largest being the 1000's digit.
>
>Is this an NMEA limit, or just what the Sony chip sets? It would mean the
>max altitude would be 9999 meters or about 32000 feet
It depends. The limits are required by the U.S. Government to prevent
Civilian GPS systems from being used for guidance systems by
terrorists/"rouge" countries..
I believe there are limits on the top speed to be reported, and a limit
some how related to acceleration.
--
Neil Johnson
http://www.njohnsn.com
PGP key available on request.
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Subject: Re: Fusing the ground lead...
From: David VanHorn <dvanhorn@cedar.net>
Date: Wed, 26 Nov 2003 21:20:50 -0500
X-Message-Number: 20
At 08:49 PM 11/26/2003 -0500, John Langtry, VE3NEC wrote:
>Folks,
>
>I'm going to jump on this topic, which came from an O.T.
>post, before our beleagered SIG admin has had enough, and
>pulls the plug.
I see the problem, but as you and bob point out, it's only an issue if you
take the radio negative lead to the vehicle battery. I frame ground, and
provide local bypassing for the radios, so it's not an issue.
----------------------------------------------------------------------
Subject: Re: Fusing the ground lead...
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Wed, 26 Nov 2003 21:58:22 -0500
X-Message-Number: 21
>I'm going to jump on this topic, which came from an O.T.
>post, before our beleagered SIG admin has had enough, and
>pulls the plug.
Why is this off topic? I can not imagine how a discussion of power issues
related to installing a 'system' in an automobile with TNC and GPS would be
considered 'off topic'?
----------------------------------------------------------------------
Subject: Re: ICOM IC-2AT info?
From: "Germino" <mgermino@sbcglobal.net>
Date: Wed, 26 Nov 2003 19:13:44 -0800
X-Message-Number: 22
So....if I understand this correct. Do not connect 12volts to the radio
where the battery connects to the radio. I was thinking about setting up a
tracker this way with the RS HTX 202. So what would be the highest voltage
regulator I could use?
I found a clip with wire leads that replaces the battery.
Mike
AD6AA
---
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