[time-nuts] Low-Cost 6+ GHz Prescaler boardforHP/Agilent53181A/53131A/53132A

[paul swed]

Bob I do the ecl trick quite often to repair older counters with preamp
issues like HP 5248 series etc. Ones you can not get parts for which is
about everything these days. A couple of stages in series have pretty good
gain and the other benefits you sight.

But not sure a lot of folks on the thread may have access to these devices
anymore.
I pick them up when I happen to be in ca. for business at $2 or so each.
Surplus stuff.
10116 as an example. By the way I do dead bug style because they only need
to work to 135 Mhz.
I might guess as a fuse a gali does pretty well. Attenuate ahead of and
behind for matching and stability. Simply stay clear of the edge cases.

On Thu, Mar 25, 2010 at 5:06 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> Every time I've ever done much "amp in front of the counter" stuff, I've
> discovered a great way to make a doubler / tripler / quadrupler / random
> number generator. There always seems to be some magic combination of
> frequency and level that does strange things, often multiple combinations.
> They rarely pop up when testing the front end design it's self. They are
> amazingly easy to come up with when actually using the device.
>
> Strange how things always seem to work that way.
>
> If you really need to amplify, something like a very high speed ECL gate
> biased in it's linear region is a good thing to try. At no extra charge it
> would give you a differential signal to route into the divider. You are
> already pretty sensitive so it may not help at all.
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of paul swed
> Sent: Thursday, March 25, 2010 4:42 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Low-Cost 6+ GHz Prescaler
> boardforHP/Agilent53181A/53131A/53132A
>
> Well if you do want a amplifier/fuse. The mini circuit gali-1 0-8Ghz is $2
> in small quantites.
> Just a thought.
>
> On Thu, Mar 25, 2010 at 4:37 PM, John Miles <jmiles at pop.net> wrote:
>
> >
> >
> > > -----Original Message-----
> > > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> > > Behalf Of Samuel DEMEULEMEESTER
> > > Sent: Thursday, March 25, 2010 10:42 AM
> > > To: 'Discussion of precise time and frequency measurement'
> > > Subject: Re: [time-nuts] Low-Cost 6+ GHz Prescaler board
> > > forHP/Agilent53181A/53131A/53132A
> > >
> > >
> > > I'm thinking about the need for a MMIC amplifier before the ADF4107.
> > > I was unable to find a cheap DC-8 GHz GaAs amplifier to put there
> > > for a try.
> >
> > Bob's right; if anything, you want an attenuator in front of that chip,
> not
> > an amplifier.
> >
> > -- john, KE5FX
> >
> >
> >
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