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

Bob Camp lists at rtty.us
Fri Mar 26 00:26:33 UTC 2010


Hi

I can't recommend a replacement, but the ERA-1's do some odd things when driven into compression. They don't make good limiters.

Bob


On Mar 25, 2010, at 8:06 PM, Samuel DEMEULEMEESTER wrote:

> Well, I just done some tests and I will not be able to avoid a MMIC in the
> front stage if I want to preserve sensitivity in the lower and upper range.
> Without a MMIC, sensitivity drops to -10 dBm at 200 Mhz and -5 dBm at 100
> Mhz. The same for the top of the range (-10 dBm at 6 Ghz, -5 dBm at 7 Ghz
> and -2 dBm at 8 GHz). This looks bad compared to the -20 dBm to -30 dBm I
> got on the 1-4 GHz range.
> 
> I think I will use a ERA-1+ MMIC. Spec'd at DC-8 GHz and "Unconditionally
> stable" according to the datasheet :-D
> 
> 
> -----Message d'origine-----
> De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
> part de Samuel DEMEULEMEESTER
> Envoyé : jeudi 25 mars 2010 23:17
> À : 'Discussion of precise time and frequency measurement'
> Objet : Re: [time-nuts] Low-Cost 6+ GHz Prescaler
> boardforHP/Agilent53181A/53131A/53132A
> 
> That's 100% true. I tried the MSA-0x86 from Avago and got some strange
> auto-oscillation and many noise at some frequencies. I will try my best to
> avoid a MMIC, but sensitivity might be lower on the < 100 MHz and > 5 GHz
> area.
> 
> 
> 
> 
> -----Message d'origine-----
> De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la
> part de Bob Camp
> Envoyé : jeudi 25 mars 2010 22:06
> À : 'Discussion of precise time and frequency measurement'
> Objet : Re: [time-nuts] Low-Cost 6+ GHz Prescaler
> boardforHP/Agilent53181A/53131A/53132A
> 
> 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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