[time-nuts] Trimble 65256 OCXO

Bob Camp kb8tq at n1k.org
Sun Nov 27 09:17:01 EST 2016


Hi

Pin 5 is the EFC reference pin. It may (or may not) have a voltage on it. If there is a 
voltage on it, it’s a voltage that the original OEM customer found useful. It may (or may not)
have a series resistor to match up with an OEM specified trim pot.

Bob

> On Nov 27, 2016, at 2:04 AM, Dave Brown <tractorb at ihug.co.nz> wrote:
> 
> This 10 MHz unit has a 5th pin that I can't find any documentation about. There have been posts in the past that have also indicated its use is unknown.  Looking at the base, the four connections in the corners are known quantities. (ground, EFC, 10 MHz out and + supply) No. 5 is midway along one side.
> I thought it may be a reference supply for the EFC pin- with a 12.03 volt supply the unknown pin measures at 2.803 volts-which is usefully above the required EFC voltage ( ~2.4 volts) to bring it on frequency.
> But does anyone have some hard data on this 'unknown' pin?
> DaveB, NZ
> 
> 
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