[GPS_Standard] Efratom 105243-001

[Stanley Reynolds]

Dave AE6EO,
 
I too have been unable to get much info the following is how I have it working:
 
(view from bottom of board)
 
..1..........2..........3
 
(gnd)......(15V)......(ECC)
 
..4.....5........6........7
 
(24V)(10Mhz)(oven status)(GND)
 
15 volts regulated for the oscillator
24 volts for oven
 
The ECC is set for 0-5 volts positive slope, it is locked to the GPS at 2.39V.
 
I also have a Efratom 105243-002 and 105243-003, they came with a hand written note that the ECC was 0-10V and both the oscillator and oven run on the same 24V supply (they installed a jumper on the board to connect the two). 
 
On ebay is a  diagram from ebay seller rdr-electronics. Quote from his ad: "Don't know what the total range of the EFC is, but it seems to sit around 4.5 volts. We measured the EFC sensitivity at 5.75x10e-7/volt (5.75Hz/volt)." 
 
The oscillator may run on 24V but I think 15 Volts is better I have no reason except rdr's measurement above to base this on.
 
Hope this helps,
Stanley N4IQT
 


----- Original Message ----
From: Dave Platt <dplatt at radagast.org>
To: stanley_reynolds at yahoo.com
Sent: Friday, May 9, 2008 10:10:14 PM
Subject: Efratom 105243-001

Mr. Reynolds,

I'm getting ready to build a GPS-disciplined oscillator project
(originally intended to use Shera's design, but it looks as
if the VE2ZAZ approach will be easier and more featureful).

I bought a surplus VXCO through eBay, and suspect it may be the
same type that you used - an Efratom 105243-001 on a break-off
sub-section of a larger board that has a plug-in daughtercard.
This whole thing appears to be a generator for a cell-specific
frequency, phase-locked to a GPS-conditioned 10 MHz, or so I think.

I haven't been able to find any documentation on the Efratom
on the net, and the company itself was unhelpful.  I *think*
I can figure out how to power up the whole board safely (it looks
as if it takes +24 through one of the pins on the DB9M connector)
but I'm a bit concerned about letting all of the Magic Blue Smoke
out by accident.

So - might I persuade you to share whatever information you were
able to figure out about this oscillator?  It looks as if it may
take +5 for the oscillator itself and +12 for the oven, and
have a 0-to-5 adjustment range, but I'm not sure even of that, and
don't know what the frequency-trimming range or slope is. 

Any data you can provide would be very much appreciated!

73,

    Dave AE6EO


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