Thanks for confirming my suspicions, Bob. I'm using a 10k 10 turn pot across
the regulated 12v supply at present to feed the EFC but I'll change to using
pin 5.
DaveB, NZ
----- Original Message -----
From: "Bob Camp" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Monday, November 28, 2016 3:17 AM
Subject: Re: [time-nuts] Trimble 65256 OCXO
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 <[email protected]> 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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