Re: [IRCA] "Hot-Rodded" DT-200VX Digital ULR is a Reality

["Mike Westfall, Lost Almost NM" <mwdx@xxxxxxxxxx>]

Ok, thanks.

Until we get a schematic, I guess it's a bit of guesswork.



On Feb 20, 2008 12:23 PM, Gil Stacy <gilstacy@xxxxxxxxx> wrote:
> Mike,
>
> The center tap may not be for the oscillator.  For instance in the
> 39/49/59's the ferrite bar has 5 leads as well.  Two connect the short coil
> to the long coil in series.  Two leads are the far ends of the connected
> coils and these go across the variable capacitor.  I assume the M37 is
> varcator diode driven to introduce capacitance.  The smaller coil is moved
> along the ferrite bar to fine tune inductance for  proper matching to ensure
> tracking.  The tapped lead is most likely there to keep signal load down and
> goes directly to AM RF pin. ( Until I hear a better theory.  Transformer for
> impedance match?).
> In the analogs above, the Oscillator coil is an IF can, L3.
>
> 73 Gil
>
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-- 
Mesa Mike
LA de NM
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