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

paul swed paulswedb at gmail.com
Tue Aug 28 18:46:24 EDT 2018


Hello to the group.
The bricks are typically in the 98-113 Mhz range from what I have seen and
do use SRDs.
So that frequency should be good especially since they generate power from
6-13 GHz in the bricks.
So maybe there is another use for those bricks you see and people seem to
want to much money for at ham fests.
Regards
Paul
WB8TSL

On Tue, Aug 28, 2018 at 5:40 PM, Brooke Clarke <brooke at pacific.net> wrote:

> 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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>
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