Missing body of my previous message (I hope):
As others have said, there are a number of versions of the 5328A
oscillator support board. Yours looks like it is from a MIL version of
the 5328A with the 10811 OCXO. Attached is the most-likely schematic,
which is from the manual for the 5328AH99 TRI-SERVICE COUNTER found in
Keysight obsolete products:
https://www.keysight.com/en/pd-5328AH99%3Aepsg%3Apro-pn-5328AH99/tri-service-counter?pm=PL
Steve
On 9/1/2020 10:24 PM, Manfred Bartz wrote:
Hi all,
I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on.
The OCXOs came with an interface board HP 05328-20027, see attached
pictures.
Questions:
1. Is it worth keeping the interface board?
a. If yes, does anyone have the schematic and the data on the ICs?
b. What is that TO220 device? and
c. why is it mounted on a standoff on the back of the PCB?
2. Any advice/caution on matching the OCXO output impedance?
3. Any recommendation for a (>= 4-ch) distribution amplifier?
4. Any advice on a low jitter comparator for further digital processing,
e.g. for a 1pps signal?
Thanks and 73
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