[time-nuts] FTS-4060M/S24

Björn Gabrielsson bg at lysator.liu.se
Fri Jun 20 03:24:29 EDT 2008


On Thu, 2008-06-19 at 22:54 +0000, Mark Sims wrote:
> I recently bought a FTS-4060M/S24 cesium beam unit.  
[...]
> There are a few issues with it.  First the crystal oven monitor reading 
> stays at 5V.  The unit has an FTS-2000A OCXO.  This is basically a smaller 
> OCXO that is mounted on a carrier and has a small connector PCB attached 
> that converts the pinouts to match the Datum 1000 OCXO.  
> The OCXO does seem to stabilize at the proper freq.  
> All the other monitor voltages seem OK.

I have a few 10.23MHz FTS2000 units. Got them running through reverse
engineering magic. Thanks Magnus! Mine are marked "Model" 2000/S02A/S18
and 2000/S03/S18 (400Hz offset model)

How is yours marked?  (assume its a 10MHz model)

Does your Cesium manual mention the pinout or the specifications for the
OCXO? Is your FTS1000 adaptor compatible with the below pinout? Does it
use pins 6 and 9?

This is the pinout Magnus found out. Connector is "DSUB with 1 center
coax and 10 pins", (used on Datum FRS rubidiums)

J1 - 1  +28Vin
J1 - 2  +28Vin
J1 - 3  EFC
J1 - 4  GNDA
J1 - 5  0V
J1 - 6  Unknown
J1 - 7  28V_Return
J1 - 8  GNDA
J1 - 9  Unknown
J1 - 10 +15Vin

thanks,


    Björn




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