[aprssig] GPS for TM-D700

Stephen H. Smith wa8lmf2 at aol.com
Mon Oct 16 14:26:36 CDT 2017


On 10/16/2017 1:38 PM, al wolfe wrote:
>      Been away from APRS mobile for a while. What is a good GPS
> receiver to use with the D700 mobile? I see lots of GPS modules now
> for drones as well as micro controllers. In the old days used a garmin
> OEM unit.
>
> Al, k9si
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> aprssig at tapr.org
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Note that you MUST have a RS-232 unit for this application; not a TTL or 
USB-intefaced device.

I have used many many of the Globalsat GlobalSat BR-355S4 devices with great 
success.  This is the SERIAL version of the popular BU-323   USB   
mini-hockey-puck device.  These are currently available on Amazon for USD $27 .

<https://www.amazon.com/GlobalSat-BR-355S4-GPS-Receiver-Black/dp/B00AMAJFUO/ref=sr_1_3?ie=UTF8&qid=1508181021&sr=8-3&keywords=globalsat+bu-353-s4>

These devices come with a mini-DIN connector on the end of a 6-foot cable that 
was intended to mate with one of two accessory cables. One was just wire 
terminated in a DB9 serial plug. The other terminated in a serial<-->USB 
converter dongle.   Just chop the DIN plug off, strip the wires and splice them 
to a cable with the 2.5mm GPS connector plug for t he D700.

Note you will need a 5VDC (*not* 12VDC !!!) power source for the GPS. 
(Additional contacts in the DIN connector were  +5VDC IN & COMMON.) You might 
cannibalize an old lighter-socket cell-phone charger. These are often available 
at dollar stores (or hamfests)  if you don't have one lying around.  Just be 
sure it is 5 VDC, not 3.3 VDC or some other odd voltage.

-------------------------------------------------------------------------------
Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net

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