At 10:00 AM 1/29/2006, Kurt Vangsness wrote:
John,
I see similar behavior. From a cold start I'm off freq by hundreds of HZ
and after something like 2 to 3 minutes there is a sudden shift and
everthing is on freq and relatively stable. I've always been surprised
that it is such a sudden shift and not a gradual shift as the osc. warms up.
A sudden shift?
Are you commanding anything, or is it just sitting there?
On my radios, sudden shifts were almost always due to the the temperature
of the DDS. If it gets too hot, it stops responding to the commands
correctly. Doesn't outright fail, but seems that some bits don't get
through. My radios are the older heatsink-less varieties, and even a small
air flow (from one of those tiny 1U high 40mm fans) entirely fixes the problem.
Jim, W6RMK