[ARC5] BC-453/Q5er Converter

[Dennis Monticelli]

Harvey,

I designed and build a two-band (80/40M) solid state converter for my
BC-453-B.  I built it over a piece of PCB acting as both the ground plane
and substrate. It was mounted over the Dyno area and fed with the same 12VDC
that powers the filaments (this ARC-5 was converted when I got it).  I used
a double-tuned front end preselector in the form of a two-section air
variable with a torroid for each section.  A small toggle swtich threw in
extra C for use on 80M.  A JFET Colpitts XTAL osc served as the LO.  Plug in
a 3.5 rock for 80M or 7.0 for 40M and the dial remains calibrated.  The
mixer is a Mini-Circuits SBL-1 feeding the source of another JFET
that serves as the mixer's 50 ohm termination and outputs to a choke load in
the drain.  A piece of RG-174 skinny coax runs from the converter to the
front antenna terminal.  I also added a 5K to 8 ohm transformer on the board
to convert the audio impedance.

It works FB without image, overload or stability problems.  There is some
conversion gain so the noise of the BC-453 is not a concern.  I've used it
by itself and also with a T-22 for on-the-air work.


Dennis AE6C

On Mon, Sep 20, 2010 at 11:23 AM, <hmitchell3 at comcast.net> wrote:

>
>
> I am looking for circuits for an 80 or 80/40 meter converter for the
> BC-543. I have several old circuits but they involve coils and IF
> transformers that are not readily available. Solid state is OK, I just want
> to finally have a working Q5er.
>
>
>
> Thanks,
>
>
>
> Harvey, K5YU
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