[time-nuts] EFOS2 Maser problem isolated! :)

paul swed paulswedb at gmail.com
Fri Aug 24 13:45:12 EDT 2018


Corby thathas got to be the most expensive fault detector I have run into.
But great to hear. Heck 5 MHz is DC.

Paul
WB8TSL

On Fri, Aug 24, 2018 at 1:40 PM, <cdelect at juno.com> wrote:

> Well after a lot of monitoring found the 5Mhz isolation amp feeding the
> multiplier to have an intermittent output.
>
> Bypassed it using one of the iso/amps that feeds the front panel jacks.
>
> Parts on order before I pull it.
>
> I did make an interesting use of two HP5065A I have cooking on the bench.
> :)
>
> Needed to monitor two 5Mhz signals simultaneously from the maser for very
> intermittent dropouts.
>
> Fed each 5Mhz into the DIV cable from the A10 assy. on each 5065A and
> manually started the 1Mhz dividers.
>
> Then if a 5Mhz drops out the 1Mhz dies and wont return until reset.
>
> After  two days caught the problem with the output of the iso/amp
> faulting its 5065A and the input to the iso/amp not faulting its 5065A!
>
> PIX of temperature controlled RF head and the two 5065A attached.
>
> Cheers,
>
> Corby
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