[R-1051] Frequency standard module

[David Ross]

Jan -

  Did you say that the oscillator starts out at 5.16 MHz then moves down
to 5.000 as the oven heats up?  Do both of these numbers come from a
single oven/oscillator?

  I cannot believe that a crystal would survive enough of a temperature
change to make it change frequency that much.  TRC-75 proportional ovens
will move like +/- 10 PPM as they warm up, compare that to the 32,000
PPM that you are seeing in the R-1051 oven/oscillators.

  If you're seeing 32,000 PPM change over warmup, then you may have just
an LC oscillator there -  maybe the crystal is not determining the
oscillator freq...

73
Dave Ross    N7EPI    ross at hypertools.com



jan at skirrow.org wrote:
> 
> The oscillators both start at about 5.16MHz, about 4-5 volts p-p output.
> The ovens heat and do shut off after some time. The temp seems low - maybe
> 145F. After awhile the output starts to droop and ultimately dies. One of
> them does pop down to 5.0000 before (sometimes) dying. Turning the power
> off and then on brings them back for a bit.
>