[time-nuts] FE-30 OCXO

Bob Camp lists at cq.nu
Sat Dec 5 01:00:40 UTC 2009


Hi

Best guess would be a system that needed to be 8 Hz off of 775 MHz after multiplication ....

Bob


On Dec 4, 2009, at 6:47 PM, Joseph Gray wrote:

> Thanks for the answer. Any idea what these things were used in? I
> can't seem to find any information on the net.
> 
> Joe Gray
> KA5ZEC
> 
> 
> On Fri, Dec 4, 2009 at 5:27 AM, Bob Camp <lists at cq.nu> wrote:
>> Hi
>> 
>> Simple answer - yes.
>> 
>> More details:
>> 
>> The oven and oscillator supplies are split so you can regulate them independently.  Since there is very little current change (and very little current) on the oscillator line you can regulate it pretty tightly.
>> 
>> The oven monitor reports the current being pulled by the oven heater. There's no need to terminate it. The two likely options are either a TTL signal indicating it's gotten to a "warm" condition or a linear voltage tracking the current. Watch it with a DVM when you put power on the oven supply.
>> 
>> Bob
>> 
>> 
>> On Dec 4, 2009, at 12:10 AM, Joseph Gray wrote:
>> 
>>> I came across a rather large OCXO from Frequency Electronics. The
>>> model number is: FE-30-OPC-2F. The frequency is: 10.763889MC. The
>>> pinout for the octal plug on the base is also labeled as follows:
>>> 
>>> 1: +28VDC
>>> 2: Oven Monitor
>>> 3: Oven Ret.
>>> 4: Spare
>>> 5: Spare
>>> 6: Osc. Ret.
>>> 7: +28VDC Osc.
>>> 8: Spare
>>> 
>>> I have a few questions. Can pins 1 and 7 be tied together to the same
>>> 28VDC supply? If so, then I assume pins 3 and 6 can also be tied
>>> together? I assume that pin 2 is simply some output voltage,
>>> proportional to the oven temperature? Is it safe to just apply power
>>> and let it run without using pin 2?
>>> 
>>> Once I know how to power this thing without blowing it up, I'll hook
>>> it up to a scope and take a look at both pin 2 and the oscillator
>>> output on the BNC.
>>> 
>>> In case anyone is interested, here are the dimensions, not counting
>>> the octal plug and BNC: 5" high x 3" x 3". There is a "Frequency
>>> Adjustment" screw on the top.
>>> 
>>> I did a Google search, but didn't turn up any information on this
>>> unit. I was rather surprised, considering the name Frequency
>>> Electronics. Does anyone know the history of these things?
>>> 
>>> One last question. The can is soldered at the base. Is is possible to
>>> unsolder it and replace the crystal without destroying things?
>>> 
>>> Joe Gray
>>> KA5ZEC
>>> 
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>> 
>> 
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