[time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01

Matt Ettus boyscout at gmail.com
Tue May 6 13:34:49 EDT 2008

On Mon, Apr 28, 2008 at 4:15 PM, Rick Karlquist <richard at karlquist.com> wrote:
> I worked for Zeta Labs many years ago.  This multiplier
>  undoubtedly has a step recovery diode that is being driven
>  at a level of a good watt or two.  In most cases there was
>  a hefty transistor to make this power.  You probably need
>  +10 dBm or so to drive it, maybe as much as +20 dBm.  Take
>  the cover off and look at the input section and it should
>  be apparent if there is any additional gain.  You can always
>  start at 0 dBm and work up, looking at the power out as you
>  go along.  The adjustment of these can be very tricky, so
>  proceed with extreme caution.


I just got the multiplier.  It draws about 220mA at 15V, but won't
produce any output.  I've given it a wide range of input powers from
very low up to about 20dBm.  I took off the bottom cover, but it only
exposes the back of a very complex circuit board.  The only accessible
parts are the trimmer caps which come through the PCB.

Any suggestions?


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