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