[time-nuts] Distribution amplifier for 10MHz

[EB4APL]

Hi,

It seems that Didier has changed his website somewhat and the links 
don't point to the referred documents. Either I was not able to find 
them navigating within the site.

Regards,
Ignacio, EB4APL



El 17/03/2019 a las 4:57, Charles Steinmetz escribió:
> Dave M wrote:
>
>> Excellent advice from Charles, especially concerning isolation criteria.
>> Should you be looking to distribute a standard 10 MHz frequency to 
>> various bench instruments, I'd recommend that you take a look at 
>> Extron video distribution amps. Several models on Ebay right now, at 
>> reasonable prices.
>
> One particular series of Extrons is the subject of the modification 
> instructions in my second link.
>
> One caveat -- there are at least two "generations" of Extron video 
> DAs.  Some have discrete circuits, and some are built using 
> high-speed, high-current opamps (the now-obsolete Comlinear CLC409).
>
> The discrete circuits are all unmitigated CRAP.  Horrible video DAs, 
> unworkable as 10MHz/+13dBm DAs without major efforts and headaches. 
> Absolutely not recommended.
>
> So, if you intend to convert an Extron video DA for 50 ohm use, make 
> sure it is one based on high-speed opamps.
>
> To make everything just that little bit more fun, *NOTE* that Extron 
> used some model numbers for first-generation discrete products and 
> *re-used* the same model numbers for later-generation opamp products. 
> One product number I'm sure this is true of is "ADA 3 180."  Another 
> may be "ADA 3 80."
>
> I'm pretty sure that all of the models named on the cover page of my 
> modification instructions are opamp-only.
>
> Best regards,
>
> Charles
>
>
>
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