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<a class="moz-txt-link-abbreviated" href="mailto:rgilson@adelphia.net">rgilson@adelphia.net</a> wrote:
<blockquote cite="mid008c01c584c7$7c86e220$6401a8c0@mdgbuft3qa24od" type="cite">
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<div><font face="Arial" size="2">Any one got any suggestions for a
WASS GPS which interfaces with a D7 or D700 and powers on with a signal
from the Kenwood's. Please no Garmen Earthmate. A display is not
necessary but power on from the Kenwood's is mandatory. Power supply
can be 12, 6, 5 VDC or whatever. I'm sure something has replaced RS
Digitravelier. Thanks.</font></div>
<div><font face="Arial" size="2">WA2WWK</font></div>
<div><font face="Arial" size="2">Ron</font> </div>
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</blockquote>
1) Earthmate is Delorme, not Garmin<br>
<br>
2) The Kenwoods don't provide any kind of explicit power-on control
signals, especially the TH-D7 which has only a three-conductor bare
minimum serial hookup (TXD, RXD, common through a 3-cond 2.5mm stereo
minijack). What they can do is provide a constant voltage on the
outgoing data line from their dedicated GPS jacks indicating to an
external device that the radio is turned on. . <br>
<br>
3) The Garmin ForeTrex wrist devices will respond to (indeed require)
the wakeup voltage on their incoming data lines before they start
talking. However this only turns off/on the RS232 interface in these
devices (one of the most power-hungry subsystems); the main GPS RX and
it's local LCD display remains live even when the RS232 is turned off. <br>
<br>
A review of the ForeTrex is here on my website:<br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/ForeTrex">http://webs.lanset.com/wa8lmf/ForeTrex</a> <br>
<br>
4) Why worry about switching the GPS on and off at all? A device
like the Garmin GPS-18 powered by a decent switching mode regulator
(not a 7805 linear device) only draws 50-60 mA at 12VDC which
translates to about 1 Amp-Hour a day. You can leave this device on
for a week or more without affecting the car battery significantly.
The advantage is that the GPS is always locked and has a currrent
ephemeris and almanac ready-to-go. <br>
<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
<br>
Home Page: <a class="moz-txt-link-freetext" href="http://wa8lmf.com">http://wa8lmf.com</a><br>
<br>
New APRS Symbol Chart <br>
<a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/miscinfo/APRS_Symbol_Chart.pdf">http://webs.lanset.com/wa8lmf/miscinfo/APRS_Symbol_Chart.pdf</a> <br>
<br>
New/Updated "Rev G" APRS <a class="moz-txt-link-freetext" href="http://webs.lanset.com/wa8lmf/aprs">http://webs.lanset.com/wa8lmf/aprs</a><br>
Symbols Set for UI-View, <br>
UIpoint and APRSplus:<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
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