[R-390] R-390A Best Cal. Procedure

[Steve Toth]

TishaAlways enjoy your posts - and your sense of humor (something sorely needed these days).
The reference to the R390A crystal oscillators stabilizing when they find their "happy place" brought a big smile to my face.
Stay safe and take care.
- Steve  W7SJT

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    On Tuesday, March 24, 2020, 12:47:38 PM MDT, Tisha Hayes <tisha.hayes at gmail.com> wrote:  
 
 I am seeing 125.22 VAC right now; It seldom deviates more than a half a
volt.

Sometimes I can hear the tap-changers down at the substation as they move a
few times each day (33 position switch; 16 positive, 1 neutral, 16
negative). Each step on the tap changer can move my line voltage up or down
0.75 volts (changers are +/-10%). The utility sets the line voltage higher
because they have some long distance runs that go up north of here, along
the crest of the mountain with no intervening tap changers to compensate
for line losses. Being close to the substation it means that I will always
be on the higher edges of what ANSI C84.1 has as service voltage limits
(114-126 VAC).

Running on the high side of mains voltage has not hurt any radios. We need
to remember that many of these were intended for some pretty lousy mains
voltages being supplied by a 10-50 KW generator that was burning fuel of
questionable quality; Maybe adjusted by an E-3 who was listening for the
right sounds from the generator and not any particular line voltage or
frequency.

Once a radio warms up and the crystal oscillators find their happy place
they are pretty stable on frequency.

*Ms. Tisha Hayes, AA4HA*


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