[time-nuts] Using commercial video amplifier for 10MHz clock distribution.

[paul swed]

extrons are dead simple. But to modify the unit say a 6 output amp RBG+S
then you have some 20-30 BNC nuts to take off. Fun.
So while you are hacking it you can also add more outputs. Most have the
holes. Add BNC and a chip R. Most of the Rs are on the back and no need to
take off the nuts. Just depends on how much work you want to put in.
Regards
Paul
WB8TSL

On Sat, Oct 19, 2019 at 6:03 AM Bryan _ <bpl521 at outlook.com> wrote:

> There is a schematic here on the Extron uploaded by a TN member. The
> schematic for the Extron looks looks dead simple that one could really just
> make a simple 3 channel with the included mods in the writeup, only problem
> is I don't see a source for a CLC409 any longer, and I don't have the
> experience or knowledge to use a substitute ADA800x ??
>
> <
> http://www.ko4bb.com/getsimple/index.php?id=download&file=02_GPS_Timing/Extron_ADA_6_modifications_for_use_as_10MHz_distribution_amp_STEINMETZ.pdf
> >
>
> -=Bryan=-
>
> ________________________________
> From: time-nuts <time-nuts-bounces at lists.febo.com> on behalf of ed breya <
> eb at telight.com>
> Sent: October 18, 2019 1:39 PM
> To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Using commercial video amplifier for 10MHz clock
> distribution.
>
> I have a Hitachi VD-1000 video distribution unit that's been sitting
> unused for years, waiting until I finally get around to making it into a
> reference unit. I just dug it out and looked inside. It is full of RCA
> jack cables for jumping the signals around in different ways. I
> apparently had changed things around already, to make one section into a
> 15-output distributor. I have forgotten all about it long ago, so now
> it's just a dizzying array of cabling. I must have made notes somewhere,
> that I'll have to find for when I eventually (probably fairly soon) do
> the proper conversion.
>
> It uses CLC404 amplifiers, which appear to be older and a little noisier
> than the CLC409, but should be OK for this. Unfortunately, it uses a
> small switching supply, which I dislike for things like this, so
> ultimately will make a linear one for it.
>
> This thing has 40 BNC connectors on the back, which would allow for lots
> of I/O and branching combinations. This is likely way more than I'll
> ever need, so the "new" plan is to incorporate some improvements,
> considering what I recently learned during my work on the frequency
> multiplier project. I'll be reducing the total fanout, and changing some
> of the outputs to have fully-floating transformer coupling, to reduce
> ground loop effects in high sensitivity applications, and also
> independent volume controls for some. I may do the same on the source
> inputs too. I don't know how many of each thing yet, but definitely
> some. In any of the BNC spots, I can easily put an isolating type BNC,
> or a volume control pot. The front panel is mostly blank, so there's
> lots of room for even more stuff there. I just have to be careful to not
> get carried away and make it too wonderful and complicated and never
> finished.
>
> I also have an Efratom something-something distribution rack with five
> "MBF" modules that have four outputs each. They should pretty good too,
> but unfortunately it's all for 5 MHz only - there's low- or band-pass
> filtering built into each channel, so needs reverse engineering and mods
> for 10 MHz. I vaguely recall looking for info on this about a year ago,
> and stumbled upon an old time nuts thread. Someone (maybe Chuck Harris?)
> had reported successful mods for 10 MHz on these, but there were no
> links to any info about it. So Chuck, if you see this, and it was you,
> or anyone else, I'd sure appreciate this info. If it was just my
> imagination, then never mind.
>
> Ed
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>