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

[Matt Ettus]

Thanks Rick.  My main reason for buying this is to be able to better
measure the phase noise of my 100 MHz oscillator.  I figured this
would give a truer measure than a brick since there is no PLL
involved.  But then I thought there might be too much filtering going
on.  If the filters are at least several MHz wide, then it should be
fine, but if there is a 100 MHz crystal filter in there, then it won't
really give me a true measure.

What do you think?

Thanks,
Matt


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.  Especially the SRD assembly.
>  There were rows and rows of technicians with sweepers who
>  tuned these up.  The sweepers would sweep typically 80 to
>  120 MHz.  Some of the techs liked to listen to the radio
>  as they worked, and since this frequency range encompased
>  the FM band, the radio would make a woodpecker like sound
>  all day long.
>
>  The Zeta multipliers were fairly similar to the multiplier
>  in the well known "brick" frequency sources (California
>  Microwave, etc).  Many people worked at both companies at
>  various times.
>
>  Rick Karlquist N6RK
>
>
>
>
>  Matt Ettus wrote:
>  > Just bought a
>  >
>  > Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01
>  >
>  > on ebay.  Anybody have any info on these?  What kind of drive should I
>  > give it?
>  >
>  > Thanks,
>  > Matt
>  >
>
>
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