[time-nuts] HP5065A Step Recovery Diode, what part#?

Brooke Clarke brooke at pacific.net
Tue Aug 28 17:40:21 EDT 2018


Hi Mike:

When selecting a SRD the lifetime should be in the neighborhood of 1/4 of the period of the drive signal.  I don't know 
how brick oscillators and 5065 drive signals compare.  If they are in the same ballpark that would be a source.
http://www.prc68.com/I/Diodes.html

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
https://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> I believe that all of those microwave brick oscillators use SRDs, 73 - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell NJ 07731
> 848-245-9115
>
> -----Original Message-----
> From: time-nuts <time-nuts-bounces at lists.febo.com> On Behalf Of
> cdelect at juno.com
> Sent: Tuesday, August 28, 2018 1:09 PM
> To: time-nuts at lists.febo.com
> Subject: [time-nuts] HP5065A Step Recovery Diode, what part#?
>
> Hi,
>
> I'll throw my two bits in!
>
> Diodes from Efratom FRS, FRK, and M100 are made for 60Mhz drive and probably
> would be a good fit.
>
> I'll take a look and see if I have any junkers.
>
> All diodes used in Rubidiums are inside the cell oven so operate at a high
> temp anyway.
>
> I agree with Ed, swapping A3 modules requires retuning. One tidbit, make
> sure the two trim caps are actually rotating! The top rotor can get stuck
> and if you force it the screw connection will break. Then you have a fixed
> capacitor, not a variable anymore. If you check ahead of time you can break
> the rotor free by levering a tool against it laterally.
>
> Cheers,
>
> Corby
>
>
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