[time-nuts] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate).

Bob Bownes bownes at gmail.com
Thu Nov 8 10:47:26 EST 2018


Video distribution amplifiers are a very good and inexpensive solution to
this problem. Think I paid $5US for my 24 port one (which is actually 3x
dual 1 in 4 out units). I converted one of them from 75 ohm to 50Ω and
didn't bother doing the rest as it made no discernible difference for
timing purposes.

On Thu, Nov 8, 2018 at 10:23 AM George Atkinson via time-nuts <
time-nuts at lists.febo.com> wrote:

>
> The 9478 is an excellent unit but slightly unconventional. It does not
> discipline the internal OXCO to the external standard when present. It has
> a 10MHz PLL VFO tat is locked to either the internal OCXO or external
> refernce depeding what is available. If the external reference is present
> te VFO is locked to that and the internal OCXO is on but not used. If the
> external refernce is missing the internal OXCO is used. Effectively when
> used with an external reference the internal OXCO is a backup.
> The service manual is out on the web nd it would nt be difficult to
> re-configure a 9478 as a dumb 10MHz Distribution unit but this would b a
> waste. 19" video distribution amplifiers are out there too.
> I do have a spare NOS Austron modular 3U 19" rack with distribution
> modules in it but I'd have to check exactly what it has and I'm in the USA
> at the moment. If you are interested I can look when I get bck next week.
> Robert G8RPI
>
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