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

Scott McGrath scmcgrath at gmail.com
Sun Nov 4 07:09:09 EST 2018


Racal overall has a reputation for making very high quality instruments,   Since the OCXO is an option,    and the price is right on the DA,   I’d probably buy it.

Also thinking since its an option the OCXO can probably be switched out of circuit or removed entirely.

Im guessing Racal thought that adding an OCXO would be a feature for shops that did not have a frequency standard and/or one that used a different frequency than ‘standard’ like a TV station.   So everything would be phase locked to a master clock irrespective of frequency.



Content by Scott
Typos by Siri

On Nov 4, 2018, at 6:50 AM, David C. Partridge <david.partridge at perdrix.co.uk> wrote:

FWIW it is trivial to modify these video distribution amps for 50 ohm output - you just need to change the output resistors form 75 ohm to 50 ohm on the board after the op-amp.

David

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of Dr. David Kirkby
Sent: 04 November 2018 10:44
To: time-nuts at lists.febo.com
Subject: [time-nuts] Racal Dana 9478 frequency distribution system with option 04B high stability oven (5x10^-10/day aging rate).

I want a distribution amplifier to distribute 10 MHz from an HP GPS
:
Currently I am using 75 ohm video amplifiers, but I suspect that is sub
optimal.


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