[HBR] Need advise: BFO coil not tapped

[bignick at execpc.com]

Just a thought .. would it be possible to add a smaller fixed coil to one
of the
leads of the existing adjustable coil.  The junction
would serve as the tap.
I would assume that the adustable range of
the coil would be slightly lessened
and the total inductance slightly
higher.

Maybe it would be worth setting up the circuit
experimentally to see if it yields
what you need?

If I
recall, I did something like that in my HBR (I wound my own BFO coil but
could
not get the inductance of the variable coil high enough w/o
adding an external
coil .. wrong type of coil slug?)

73
Tom Nickel AKA KC9KEP AKA Big Nick


> All: 
> I
have a Miller adjustable coil, 12-25 mH, that doesn't have a tap. I 
> would 
> like to use the BFO circuit shown in the HBR
schematic (take your 
> pick...they all seem to have that same
tapped coil configuration). Is 
> there 
> any way I can
formulate something equivalent without having to resort to 
>
removing windings and adding a tap? I think a capacitor voltage divider

> might be in order but that also induces a few unknowns. Any
help would be 
> appreciated. Cal, n6KYR/4 
>
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