[time-nuts] Noisy varactor diodes

paul swed paulswedb at gmail.com
Tue Dec 18 21:36:29 UTC 2012


Good find on the diodes and as you say at least worth the try. Will bet
they are 10 x less expensive then americanmicrosemi. But I will say in a
pinch they bailed me out. :-) Tunnel diode for a TDR.
Regards
Paul.

On Tue, Dec 18, 2012 at 2:55 PM, Brooke Clarke <brooke at pacific.net> wrote:

> Hi Corby:
>
> Did you measure the reverse leakage current on the good and noisy diodes?
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.**end2partygovernment.com/**2012Issues.html<http://www.end2partygovernment.com/2012Issues.html>
>
> cdelect at juno.com wrote:
>
>> I was recently repairing a noisy A3 module for an HP 5065A.
>>
>> The phase modulator has 4 varactor diodes in parallel.
>>
>> Since I suspected a diode, I removed them one at a time.
>>
>> Of course it was the last one! Must be a universal rule there!
>>
>> Anyway here is a PIX of the noise with the diode reverse biased at 20
>> volts.
>>
>>
>> Anybody know where to get an MV840 ???
>>
>> Thanks,
>>
>> Corby
>>
>>
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