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

Bob Camp lists at rtty.us
Thu Mar 25 21:41:09 UTC 2010


Hi

Even using EL116's in die form on a thick film substrate, I've found it pretty hard to keep everything playing nice over a wide range of levels, distortion, and frequency. 

Bob


On Mar 25, 2010, at 5:23 PM, paul swed wrote:

> 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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>> 
>> 
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