[HBR] Tuning front end coils

[Peter Bertini]

Adjust the inductance (winding spacing) for best tracking at the lowest
frequency. Adjust the trimmer capacitor for the high end tracking. Each will
interact with the other to some degree. If you end up needing to spread the
windings beyond the physical space available, you may need to remove turns.
If you have to compress the turns and there are no gaps left, you may have
to add turns.

Pete

On Mon, Aug 9, 2010 at 7:31 AM, <bignick at execpc.com> wrote:

>
>
> Hello all,
>
> How has everyone's
> experience been with respect to tuning the "front-end" coils
> on the HBR?
>
> It think the procedure is:  Peak the coil
> (L2/C2) at the low end of the dial.
> Tune to the high end.  If
> you need to add capacitance to peak the coil, you
> have too much
> "L" and need to pull apart the windings.
> If you need less
> capacitance, push the windings together.
>
> (Same for L1/C1).
>
> (I think I've got that right; I'm going by memory here :-)
>
> I first tried using the internal alignment oscillator to do this,
> but it seems easier
> to just use the background noise and resulting
> audio to peak the coils.
>
> But I seem to be going back and forth
> without hitting the magic combination..
>
> Anyone care to share
> his or her experience here?
>
> (I'm using the 20m coils at
> present.)
>
> Thanks!  73
>
> --Tom Nickel
> KC9KEP
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