[Elecraft] acceptable amount of drift?

[Masleid, Michael A.]

Hi Tim

K2/100 with 80 Hz drift on 40 meters?

The VCO should do better than 100 Hz from a cold start.  If that's on 10 =
meters,
then I guess it would be 25 Hz on 40 meters.  Mine does a little better,
20 Hz on 30 meters.  But I don't transmit much.  I don't think the PLL
upgrade can fix that, since everything has to warm up to equilibrium =
before
the thermistor can do much good.

The PLL modification should get drift down to 20 Hz per 15 degrees on 20 =
meters,
so on 40 meters that would be 10 Hz per 15 degrees F..  To get 55 Hz =
more drift,
we need a temperature 5.5 times 15 degrees.  The PLL upgrade suggest =
that 10W
continuous into a dummy load could cause a 15 degree rise, so you'd have =
to
be running 55 watts average power.  Hard to do on CW?  If you didn't =
transmit
much, and the room temperature didn't go up a lot, then 80 Hz is more =
than
expected.

The value of RA on the PLL reference upgrade can be adjusted to fix =
this, but you
need to have a way to measure the drift.

Any way, 80 Hz doesn't matter unless you'r using narrow filters on CW.  =
On SSB
I think voices sound a bit odd if they're off by more than 50 Hz.

Michael, AB9GV