[ARC5] BC-453/Q5er Converter

[Leslie Smith]

Hello Harvey,
I have a home-brew cct (my own) and if no-one else helps I'll post the cct.  (I don't have it in electronic form.)  Briefly it consists of a colpitts/crystal oscillator on 3200kHz.  I mix this in a source coupled JFET.  This covers 3.5 to 3.7 MHz - this is the full band here in Oz.    I don't tune the output - I use a resistor for the load, capacitively coupled to the R-23.  The source coupled JFET mixer is said to handle strong signals well.  I built the converter in a die-cast box.  The solid box gives my cct the very best stability.  

How does this work?  In my view, for non-contest work, very well indeed.  I listened on 80m during the Remembrance Day Contest (August, an Oz WWII rememberance) and heard ZL stations at least as well as the club station using modern transistorized gear with a full dipole pointed in the right direction.  Stability?  Good enough for SSB.  The 12K8 is a little noisy, but on 80m there is always a lot of noise.  I use a loudspeaker - transformer coupled in place of the headphones.  A small transistor radio o/p xfmr is ideal in this role.  The volume is adequate - just.  I run 60v B+.  I have the power supply cct in electronic form.

My view is that this arrangement would work well for a novice on 80m - effective, cheap, stable, selective.  But then you are talking about a double conversion superhet.  GOOD TO HEAR YOU DOING THIS.  IT'S WONDERFUL TO SEE THESE SETS ON-AIR!


)))> 73 <((( de Oz

Les




> ----- Original Message -----
> From: hmitchell3 at comcast.net
> To: arc5 at mailman.qth.net
> Subject: [ARC5] BC-453/Q5er Converter
> Date: Mon, 20 Sep 2010 18:23:34 +0000 (UTC)
> 
> 
> 
> 
> 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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