On 16 Nov, 22:09, (Chris Suslowicz) wrote:
In article .,

Antonio Iovane wrote:
On 16 Nov, 17:13, (Scott Dorsey) wrote:
Antonio Iovane wrote:

Hi all,
I own a tube type racal unit whose nameplate says : RECEIVER FINE
TUNING UNIT -
MODEL MA161. It has the usual look as other vintage Racal equipment,
is for rack-mount and is two rack units high.
I' ve found no reference anywhere. Does anybody out there know what is
it?

If it is what I think it is, it's an antenna distribution device with a
calibration oscillator that creates markers every 100KC.

Which brings to mind... anybody have schematics or docs for the Racal
MA937 or MA926 power supplies?
--scott
--
Thanks Scott, but I think it isn't what you think it is. I guess it
should belong to the family of external local oscillators that were
used in substitution of internal LO. It is tunable within +/- 500 Hz
with marks every 10 Hz. It has only one output connector and no input
whatsoever.

Ah. In that case it's an add-on feature to make a 1kHz resolution
synthesized receiver into a free-tuning one.

Basicly what I would like to know is what receiver it was
meant for

No idea, except that it will *not* have been anything cheap, and
possibly not a commercial item. Maybe Naval or long-haul short wave
communication links? COMCAN? Expect something huge and rackmounted.

what of the local oscillators it would substitute, and
whether anybody have any reference to point me to.

Google fails to find anything, unfortunately.

Chris.

Not so huge, rack mounted but only two rack units, four valves, a
small crystal oven with two crystals, a tuning knob with dial, a
rotary switch which says: NORMAL, NORMAL +/- dF, FSK, FSK +/- dF.
My unit has serial number N00016. Probably only very few units were
ever made. No track anywhere. Probably this unit of mine is the sole
survivor today.

Antonio