Hi Ed,
will try.
About the Helical-Filters, I saw that they have a low limit
of 430MHz, so they sould maybe do it.
I'll keep you informed.
73
Bernd
--- In Repeater-Builder@yahoogroups.com, wa6rqd <[EMAIL PROTECTED]> wrote:
>
> Bernd Maestling wrote:
> > ok, so far so good.
> > The RX-module won't work. The PLL don't lock, L1 voltage is low
> > (0,16V) and on TP12 I have about 433MHz (also near the VCO).
> > The TCXO is working ok.
> >
> > 73
> > Bernd
> > DM5BM
>
> To receive at 431 the VCO will need to be at 431MHz-45MHz(1st IF) or
> 386MHz. It was built to go from 395MHz to 440MHz. This may be below
what
> the VCO will tune without adding some capacitance. First try adjusting
> the trimmer capacitor to the lowest frequency you can. If this is above
> 386MHz, you will need the extra capacitance to get the VCO into the
> correct range. Look in your manual near the back at the parts list for
> the VCO for the differences between range C and range D. There are a
few
> capacitors and one resistor that are slightly larger on the D range.
You
> can either parallel some small chip caps or replace the current ones
> with the new values. The coaxial resonator is also longer, but as you
> are only going down to 431 the current one may be long enough.
>
> Try adding 1.5 pF across C7 on the RX VCO.
>
>
> Once the VCO is going, you may find the helicals need to be
lengthened also.
>
>
> Ed Yoho
> WA6RQD
>
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