[ARC5] 10 meter BC-454 - Drift.

[Kenneth G. Gordon]

Conditions: Initial frequency: 28.500 MHz. BFO: On. Main tuning; untouched. Power: Off 
since last night. HP-8640B not turned off since yesterday.

Result: Drifted 16 KHz lower within 5 minutes. 30 minutes later, drifted an additional 7.5 KHz. 
lower. 60 minutes later, no substantial change.

Final frequency: 28,476,426 Hz

Total drift: Approximately 26.5 KHz.

I suppose that considering that the receiver is now operating at 10 times its original operating 
frequency with home-made coils, and no attempt at temperature compensation, this result is 
"acceptable".

Would anyone here wish me to begin again, and take readings more often in order to plot a 
graph?

I think it is unnecessary...

The receiver is, to my mind, not all that stable: every time a piece of equipment in the home 
starts and stops, I can hear the receiver change frequency. The BFO pitch "burps".

The power supply is completely unregulated. I might try a regulated supply to see if that 
helps. It probably would.

Ken W7EKB