[ARC5] 10 meter BC-454 - Drift.

[Geoff]

Just put a Hallicrafters tag on it and call it done.

Othewise drag out one of those 3-4pf N750 caps and hang it off the HFO cap. 
Dont even bother realigning if it is not too far off.

Carl


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: <Arc5 at mailman.qth.net>
Sent: Thursday, March 07, 2013 4:04 PM
Subject: [ARC5] 10 meter BC-454 - Drift.


> 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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