[time-nuts] Looking for information on True Position GPSDO.

Gregory Beat w9gb at icloud.com
Mon Mar 19 12:38:44 EDT 2018


True Position was a Berwyn, PA mobile industry equipment provider.
In 2014 they acquired Skyhook Wireless and changed company name to acquirer’s.
—
These True-Position units are surplus from the cellular/mobile phone industry.
Several years ago, when these units first appeared (2010/2011), the Mt. Airy VHF Radio Club (“Pack Rats”, Philadelphia, PA area) created a Technical Project to use these GPS units as a cheap GPSDO for amateur radio (and time-nut) users.
http://www.packratvhf.com/index.php/technical-articles

A Packrat GPS Receiver Project
by Gary WA2OMY and Bruce WA3YUE
http://www.packratvhf.com/index.php/technical-articles/160-gps-receiver-project

This project was developed to use surplus GPS receiver boards to provide a precision 10 MHz reference for the ham community using equipment that accepts a 10 MHZ reference or clock. We hope to have accomplished this at a reasonable cost to the community.
Project PDF (31 pages, extensive photos for beginner DIY / Maker)
http://www.packratvhf.com/attachments/article/160/A-Packrat-GPS-Receiver-Project.pdf

The Internet Link (above) has the necessary HEX files with or without Display,
as well as PDF of the Club’s Powerpoint presentation.  The Mt. Airy club NO LONGER have surplus TruePosition units, as this club project was 7-8 years ago.

MANY Asian eBay resellers are NON-STEM, 
relying on Mt. Airy project and other published documents to determine $$ surplus value.

Greg, w9gb
===
Date: Sun, 18 Mar 2018 09:59:08 -0500
From: John Green <wpxs472 at gmail.com>
Subject: [time-nuts] Looking for information on True Position GPSDO.

There is a small, about 3.5" by 4.5", GPSDO board being offered by several
sellers on eBay. I bought one from what looks to be the only US based
source. It is identified as True Position, Inc., and had a small CTS OCXO
and Furuno GT8031 on board.
==
Sent from iPad Air


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