[time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01
Matt Ettus
boyscout at gmail.com
Tue May 6 17:34:49 UTC 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.
Rick,
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?
Thanks,
Matt
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