Harold E. Johnson wrote:

And I assume that the PP means Peak to Peak. I'll acknowledge that a battery
has a peak Voltage, in this case, something close to 9 Volts. I doubt it
could be rated as Peak to Peak which would imply at least a couple of the
things wired back to back and providing around 18 Volts. (Peak to Peak
speaking of course, not Push Pull, cancelling even harmonics, or even
Push-Push, cancelling odd ones.)
========
PP is just an identification for this size of battery like AA and AAA
for 1.2/1.5 V cylindrical batteries

The polys have a generally acknowledged negative temperature coefficient and
as such must be correcting for something. The inductor is an air wound
solenoid, wound on a toroid or perhaps a (for the frequency range spec'd)
quite long piece of coaxial cable?
=======
The Toko inductor with adjustable core is a canned component frequently
used by homebrewers and still available . It comes in 3 model for
various frequency ranges. In Europe (and that includes Britain ) it is
particularly popular by the QRP community.

If you observed 20 Hz of drift over a half hour, after a 20 minute warm up,
I would be inclined to ask as to the ambient temperature variation during
that 30 minute exercise.
==========
As stated in my previous message ,the above referred freq. drift was
observed at a stable room temperature. In fact it was in an underground
civil defense bunker where a radio club is hosted by the local
Emergency Planning people( a sort of regional FEMA)


NOT linuxed, have enough trouble with Bill Gates's products.
============================
Having problems with Bill Gates' bloatware is the best possible reason
to move to Linux ,which is free and can be freely and frequently updated
at umpteen repositories world wide.
It takes some effort ,since everything in Linux can be configured by the
users . But that keeps the 'grey matter' in the head active .
Also Linux doesn't need the latest and fastest machine .
I run my system on a motherboard with a 1GHz Athlon processor and 1024MB
of RAM ,from AD 2001.
My advice : GOFOR Linux and enjoy !


Frank GM0CSZ / KN6WH