Re: Hacking the Si4734: two more PDFs


Roy <roy.dyball@...>
 

Hi Phil

I took the time to draw out the G8 front end. The PL-310 and PL380 are similar but with more components in the filter. The same is true for an 02-2010 model PL-300 which has a redesigned front end/audio board compared to the original G8. Feel free use the diagram if you want to.

Cheers Roy. 

--- In ultralightdx@..., "Roy" wrote:
>
>
> Hi Phil
>
> Having a look at the SW pre-amp/filter in the G8 there appears to be two
> transistors built around a small toroid transformer. To the right of
> that are the 2 transistors used to switch the (diode) signal onto the AM
> line. In the PL-380 the surface mount transistors for the filter/amp
> have been replaced with three leg non surface mount devices.
>
> Phil I finally had a chance to look at the capacitor values when set on
> SW. The programming manual recommends the varactor be set to 1 which
> means the capacitor will read 7.095pf for all frequencies above 1710Khz.
> But just for the heck of it I left it in automatic. Here is what it
> read.
>
> 2.3Mhz 141.6pf
> 5.0Mhz 25.25pf
> 8.0Mhz 11.56pf
> 8.5Mhz 7.095pf
>
> Cheers Roy.
>
>
> --- In ultralightdx@..., "just_rtfm" just_rtfm@ wrote:
> >
> > hi everyone,
> >
> > i added two more Si4734 PDFs to my site:
> >
> > 1) KK-D48L circuit description
> > 2) shortwave antenna musings
> >
> > http://home.comcast.net/~phils_radio_designs/index2.htm
> >
> > regards,
> > phil :)
> >
> > PS error reports welcomed
> >
>

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