[time-nuts] TruePosition GPS Receiver

Ben Hall kd5byb at gmail.com
Tue May 9 17:06:17 EDT 2017


On 5/9/2017 9:41 AM, Tim Lister wrote:
> cables using LMR-100A cable for the two right angle connectors J9 and
> J10 which both seem to be fed from what looks like a SMD transformer
> with a LT1761 regulator on the other side of the board. Is this a 1PPS
> output - there seems to be a testpoint (TP93) nearby which could help
> diagnose it.

Hi Tim and list,

I put the scope on mine last night - J9 and J10 are both 10 MHz outputs 
and J8 is 1 PPS.

> Does anyone know of a source for
> cables for the J2/serial output or is it OK to use mini-grabbers/0.1"
> plugs to a RS232 breakout ?

I built my own - had a leftover serial cable from, ironically enough, an 
old GPS unit with a DB9 on it and bare wires on the other.  I installed 
some 2.54mm crimp connectors onto the bare wires and just plugged it in.

It is full-on RS-232 with real RS-232 signal levels, so don't 
accidentally hook it up to TTL-level serial.  I almost did that the 
other day in my excitement to get it up and working.

Personally, I wouldn't use the mini-grabbers...but that's just me...

thanks,
ben



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