Re: [time-nuts] Looking for Z3801 OCXO

2016-02-05 Thread ed breya
You may have seen this before, but there is a nice writeup on how to disassemble the whole thing, with pictures and all. http://www.realhamradio.com/GPS-oven-journey.htm I had to take mine apart quite a few years ago to replace the opamp in the inner oven temperature regulator circuit. If your

Re: [time-nuts] Looking for Z3801 OCXO

2016-02-05 Thread John Ackermann N8UR
Thanks, Warren. That's a very nice solution! I have a unit on the way from another time-nut, so I should be set. I'm pretty sure the problem with the old unit is just aging as I watched the EFC creep for months toward the limit. I bought two units at the same time (long, long ago) and though

Re: [time-nuts] Looking for Z3801 OCXO

2016-02-04 Thread ws at Yahoo via time-nuts
John If it is off very far the first thing I'd suspect is the inner oven. Assuming the freq is still stable and low noise, one option is to rewire it, and make the freq adjustment accessible. Removing the original inner wiring wrap also provides many other advantages, and no down side that

Re: [time-nuts] Looking for Z3801 OCXO

2016-02-04 Thread paul swed
John, Like you I have a bad oscillator and I also pulled the thing apart to find "The goo" Nasty stuff. Also re-wrapping the outer oven wire would be a big pain. Since that 3801 had further issues I set it aside. Regards Paul WB8TSL On Thu, Feb 4, 2016 at 1:20 PM, John Ackermann N8UR wrote: > I