[time-nuts] HP 5087A Input Doubler and 10 MHz Ampifiers

John Miles jmiles at pop.net
Mon Jul 7 22:18:15 EDT 2008

There is nothing special about the 5087A's amplifier cards.  The 5087A
design is not especially quiet; in fact, it will degrade the broadband floor
of a Thunderbolt by a good 7 or 8 dB from what I have seen.

I'd say grab some PCB prototyping stock and a Dremel tool, and surf through
Bruce's notes and references at
http://www.ko4bb.com/~bruce/IsolationAmplifiers.html for some ideas.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of christopher hoover
> Sent: Monday, July 07, 2008 6:55 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] HP 5087A Input Doubler and 10 MHz Ampifiers
> "NE8S" <ne8s at earthlink.net> wrote:
> > I am in need of the following Opt PCB's for the HP 5087A:
> ....
> > Qty. 11    5087-60012 (10 MHz Amplfiers)
> Good luck.  I like to a have some more of these as well.
> I have considered doing a run of 60012 boards.  This would be
> straightforward except for one thing: I have been unable to find any spec
> for the transformers.  That part would have be to characterized.
> Note that you can convert 5MHz boards to 10MHz by changing a couple of
> discrete component values.
> -ch

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