[time-nuts] OFC (McCoy?)(Isotemp?) OCXO

ernieperes at aol.com ernieperes at aol.com
Fri Oct 31 11:52:28 UTC 2008


Hi Dick,

I also have the same OCXO   OFC  and tried in a Brook Shera circuit but 
I was not satisfied....
on the long run I could notice the day and night temp difference on the 
EFC scale and the phase plot also show
similar deviation...

Rgds Ernie.



-----Original Message-----
From: Richard Moore <richiem at hughes.net>
To: time-nuts at febo.com
Sent: Fri, 31 Oct 2008 12:55 am
Subject: [time-nuts] OFC (McCoy?)(Isotemp?) OCXO



Just received this OCXO from mr. fluke in China. Took exactly 14 days
from time of order to get here to W. Washington. Hooked it up like
the Isotemp 134 diagram. He said it would work, and it works perfectly.

The Isotemp spec EFC voltage range (positive slope) is 0 to the ref.
voltage, in my set-up, +8.0V. On this OFC unit, I found no change in
frequency until the EFC gets to about 1.28V. It reached 10 MHz, to
within 1E-9,  at about 3.33V, with a total frequency span (1.28V to
7.9V) of 10.6E-7, or very roughly 1.6E-7/V.  Unlike the Isotemp 134,
this one has no trimming adjustment, so the only freq. control is via
the EFC line, whose slope seems quite non-linear.

Output is a very clean sine wave, about 2.8Vp-p unloaded and 1.8Vp-p
into 50 ohms.

This thing reaches temp fast and seems to be quite stable, but I
won't have any reliable data until it is used in a more permanent way
with stable supply voltages. Seems like a very nice unit.

Dick Moore

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