High Stability 10MHz OCXO Upgrade PCB Module for Racal 19xx Series Frequency Counters and Timers
A high performance OCXO replacement upgrade PCB module to be used with the counter/timers originally fitted with the "04STD" and "Opt 04C" un-ovened crystal or "Opt 04T" TCXO 10MHz references.
Racal Dana 1991 Universal Counter
Racal Dana 1992 Universal Counter
Racal Dana 1998 Frequency Counter
Racal Dana 1999 Frequency Counter
Many of these Counter/Timers were originally fitted with a basic un-ovened "04STD"/"Opt 04C" 10 MHz Crystal modules or the "Opt 04T" Temperature Compensated Crystal module. These original modules gave accuracies of between 2E-6 and 3E-7.
Our OCXO Upgrade PCB has a small OCXO module giving up to 2 orders of magnitude improvement on these original boards giving stability of better than 1E-8.
Specification:
Temperature Stability: 0 to 70 degrees C is better then 1E-8 (2 orders of magnitude better than the 04T option)
Ageing: 5E-10 per day, 1E7 per year.
Fitting instructions:
Fitting is easy and takes 5 minutes and you just need a small Posi-Drive/Philips screwdriver. Refer to the item photos for help.
- Unplug the counter from its supply
- Remove the rear bezel (2 screws) noting which way up it was orientated as it only fits back on one way.
- Slide off the case
- The original reference PCB is mounted by a single screw and into a 5 pin header on the PCB. See photos. Remove the screw and the original PCB taking care not to lose the screw and washer.
- Mount the new PCB into the counter as shown in the photos and secure with the screw. The rear mounted adjustment trimmer need to point towards the back panel
Take care to make sure you have aligned all the pins on the main board with the socket on the new oscillator PCB - Reassemble the case and rear bezel.
The oscillator PCBs are soak tested for 24 hours then aligned against our GNSS Disciplined 10MHz reference before shipping. If you need to adjust/trim further with a local 10MHz source you trust, the adjustment pot is accessible from the rear panel.
The OCXO PCBs come with a 12 month warranty against failure.