[HBR] 40m osc coil

[Ian Wilson]

Thanks to the great work of a list member I have a set
of blank coil forms with 5-pin bases. Actually, I have four -
a very good idea considering my ability to destroy things.

The HBR-16 came with a 20m coil set only. However, this
is a useful reference. The coils agree with the published
info, so I know that the correct tuning cap was used.

After some non-fatal mistakes (calculating the length of
wire required and getting it wrong by a factor of 2, for
example), I have a functional coil. However, the tuned
winding is ugly and misspaced. This appears to be due
to the Cu wire I used being too springy. It has lots of
memory for kinks, etc. I plan to remove the winding and
try rewinding it. However, I am not clear how a 6.5-turn
winding occupying 3/4" can retain even spacing without
some help - and it can't be anchored until the calibration
is done. Hmm.

The coil will tune to 8600kHz (monitored on a nearby
receiver) with the tuning dial set for 7MHz. It's about 10%
off at 7.2MHz. Not a bad start.

I only have two 75pF APCs so won't be winding any 80m
coils. 80m is not a very useful band for me at this QTH
in any case.

Since the radio has an existing tuning scale, I would like
to fit the new coil to the old scale. I realize that this may
be too difficult, though.

73, ian K3IMW