[time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01
boyscout at gmail.com
Mon Apr 28 19:29:30 EDT 2008
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?
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
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts