[ARC5] What the heck is a "1/2 harmonic Q-5er?

[Kenneth G. Gordon]

On 9 May 2020 at 11:09, Doran Platt wrote:

> 
> Bob,
> Yes, the concept was written up in ER magazine by Joe, WA3EJT.  I 
> simply loop couple the Q-5er to the last IF of the BC-348 and tune the 
> LF receiver to 1/2 the IF of the BC-348 minus 50 kHz.  I adjust the 
> variable IF cans in the LF receiver to about 1/2 down and all works 
> really well.  The BC-348 becomes entirely usable in crowded 
> conditions.
> Jeep K3HVG

Yes. Exactly. Turns out that the IF output of most receivers has a good harmonic output and 
tuning the BC-453 or R-23 to 1/2 the frequency of the IF (915/2=457), the Q-5er "hears" that 
just fine and works just like it does with a receiver which has a 455 kc IF.

I have that article here somewhere. I have forgotten the year and number of ER in which it 
appears.

Joe Long went into quite a lot of detail on this process, and tried it with several different 
receivers which had IFs other than 455 kc. It worked perfectly in all cases he tried.

Ken W7EKB