I recently had good luck opening up a soldered oscillator with a utility
knife. Rather than use the sharp edge, I used the back edge of the
blade. That way, instead of trying to push the solder aside, the blade
actually digs it out of the crack - sort of the way a cutter works in a
metal lathe.
Of course, great care is required to ensure that you don't amputate
something!
Ed
Joseph Gray wrote:
Well, I wasn't thinking that specific :-)
I was just curious about this line of OCXO's. They are rather large by
today's standards. I find it curious that I don't find any info or
history on this type of OCXO, being it is made by FEI. You'd think
their web site would have some history.
The other point I was wondering about is the possiblity of unsoldering
the base without destroying the OCXO. The can looks to be stainless
steel and I imagine it would take a bit of heat to unsolder it.
Although I appreciate Bob's replies, does anyone else care to add anything?
Joe Gray
KA5ZEC
On Fri, Dec 4, 2009 at 6:00 PM, Bob Camp <li...@cq.nu> wrote:
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 <li...@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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