[time-nuts] Advice on 10 MHz isolation/distribution SRS FS700

[Bruce Griffiths]

Using an amplifier with AGC like the MC1590 is a sure method of ensuring 
high flicker phase noise and a high phase noise floor.
The emitter followers by themselves provide insufficient reverse 
isolation for most applications.
Usually one requires 0dB (or perhaps more) gain so that an input preamp 
with at least 6dB gain is required.
The widespread use of inductors precludes this circuit from 
consideration if one wishes to avoid magnetic components.
Another issue for some applications is the relatively high dc emitter 
current required by the emitter followers to produce the desired RF 
output level.
For some applications this may be an issue.

Bruce

Bob Camp wrote:
> Hi
>
> Boy, that's an old circuit. I don't think I would want to try to buy the
> chips in the "front end" of that amp. I also suspect the front end is a bit
> noisy.
>
> The output stuff with the 3904's looks very reproducible though. That end of
> it certainly is worth looking at.
>
> Bob
>
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Electronics and Books
> Sent: Thursday, February 18, 2010 9:54 AM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Advice on 10 MHz isolation/distribution SRS FS700
>
> An easy way to make a 10 MHz distribution amplifier is the one from Stanford
> Research.
> Manual can be find at :
> http://www.thinksrs.com/downloads/man.htm
> Download FS700
>
> The schematics are in the back of the manual.
>
> Met vriendelijke groeten
> Regards
>
> ElectronicsAndBooks at Yahoo.com
> http://www.ElectronicsAndBooks.tk
>
>
>
>
>
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