[ARC5] 10 meter BC-454 - Drift.

[Dennis Monticelli]

Gee, Ken, you've poured so much effort into that box already, I think you
should go just a tiny bit further and phase lock it to a Rubidium standard
:-)

Dennis AE6C

On Thu, Mar 7, 2013 at 1:04 PM, Kenneth G. Gordon
<kgordon2006 at frontier.com>wrote:

> 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
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