[HBR] The long, SLOW HBR project

[Walt Hutchens]

The BFO temperature compensation seems to be okay: It started with a
downward drift of over 1 kc over an hour or so and after several tries is
now wandering in a 200 cps range around the starting frequency.   Could be a
bad part in there somewhere.  I will swap the tube first, then open up the
(rewound command set BFO) coil and make sure all is solid inside, ending
with making sure I actually did put nail polish strips on both sides of the
coil.   

It may well be just variations in the line voltage.  The BFO is the triode
half of a 19JN8 (pentode is the 1st audio stage) in a modified Colpitts
circuit so voltages matter and the plate voltage isn't stabilized.   It's
not really a problem.

Next I need to finish up the local oscillator stabilization, both for 80M
and 20M -- the two sets of coils I have wound.   Then, I think, 40M coils
would be in order. 

It's in pretty good shape.    Unfortunately the weather is about to force me
to put off a cabinet until next spring -- I do woodwork outdoors and other
fall work (leaves, gutters, cars ...) is keeping me from the important stuff
right now.

Walt
KJ4KV