[time-nuts] OCXO Adjustment Question -- Oven Cycling
lists at rtty.us
Wed May 8 19:52:06 EDT 2013
Clip a DVM on the power leads of the OCXO and see if the supply swings at the same rate as the frequency. It doesn't have to be anything fancy. If the problem is the supply, the swing will be obvious with >= 3 1/2 digits of resolution.
To be *really* sure, put a DVM in series with the oven supply lead and watch the current. That will also tell you if it's cycling due to an internal problem.
On May 8, 2013, at 7:05 PM, Frederick Bray <fwbray at mminternet.com> wrote:
> Thanks for the comments.
> The 5110 has the ability to run on 12 volts DC and then the only "processing" of the power is to derive 6 volts and a -7 bias. I am going to try it on battery power and see if that makes any difference. (I haven't touched the main supply yet, but I did rebuild the DC board by replacing all the electrolytic capacitors and several resistors that had increased in value well beyond any reasonable tolerance.) The battery test should help to narrow things down.
> Probably a more modern OCXO would be a useful improvement in any event.
> On 5/8/2013 1:50 PM, Bob Camp wrote:
>> If it's moving up and down from +1 to +17 Hz from 10 MHz relative to 10 MHz,
>> it's broke. Either the OCXO it's self is in trouble or the supply going into
>> it has an issue.
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