Posted by
Ron D'Eau Claire-2 on
Apr 26, 2006; 4:23am
URL: http://elecraft.85.s1.nabble.com/Need-help-for-sick-K1-tp389102p389122.html
Fred, K6DGW, wrote:
Mine seems to drift about 450 Hz from cold-start to scheduled QSO time,
over maybe 30 mins which is great as far as I'm concerned.
-------------------
Is that your K2 that drifts that much or the SX-28? I can imagine the SX-28,
but the K2 should not drift more than perhaps 50 to 100 Hz from a cold start
at the worst. My K2 starts out about 60 Hz off and is on frequency and
stable about 30 minutes later.
My HRO-5 receiver stayed on 24/7 too, at least the filament power. Not only
did it keep stable that way but it was easier on the tubes and many other
parts too, as you know. Of course the HRO-5 had a dial calibrated
arbitrarily from 0 to 500. The operator was left to consult a graph of
frequency vs. dial reading to determine where to set it for a given
frequency. The graph allowed an accuracy of perhaps 25 or 50 KHz! Other
means were needed to arrive at the dial setting needed for any higher
accuracy.
The bottom line, as you know, was that the exact frequency wasn't needed
then just as it isn't needed that often for Ham activity today, except to
tell where the band or sub-band edges are. Within the bands we looked for
clear frequencies, not specific frequencies. If we were listening for
someone to call on sked or a net, we knew enough to tune around the
approximate frequency where we had expected them, not to look at an exact
value.
So I don't know that the extra accuracy we have in modern rigs is needed as
much as it's simply a by-product of a more stable design. It still doesn't
mean much in daily use within the Ham bands.
Ron AC7AC
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