[time-nuts] EIP545A 18GHz counter query

Chris Wilson chris at chriswilson.tv
Fri Dec 7 10:22:36 UTC 2012


> This is where I am now, I hope the above makes some sense if
> viewed with the service manual and the schematics. Thanks.

07/12/2012 10:17

Latest update:

Removed Q12 from board A109 and put a 1k resistor across vacant
emitter and collector board holes, thus putting 12 volts into the
mixer to switch it externally. Counter now works perfectly on Band 2
and I followed the signal path from R2 / R3 junction (wrong impedance,
but a reference nonetheless) through to the anode of CR3.

Hopefully self explanatory with regard to file names, scope patterns
are at http://www.gatesgarth.com/scope/scope.zip

Pretty stuck as to where to go next now.

       Best Regards,
                   Chris Wilson.

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