[ARC5] Re-reading Gordon White article...

[Kenneth G. Gordon]

I have been re-reading an article written by our own esteemed Gordon White for CQ 
magazine back in 1967 entitled "Command Set Receivers for All Frequencies - The Easy 
Way". In this article Gordon published data he got directly from ARC detailing the various coil 
and capacitor parameters to make receivers that cover from 190 Khz, through 40 MHz.

One particular parameter I find to be both extremely interesting and completely puzzling, and 
I hope someone here can explain this to me.

This is the resonant frequency of the RF amplifier plate coil, L-2, called the "mixer coil" in the 
data. The data is given as "...cold, with all tubes in place".

For instance, for the 3 - 6 MHz receiver, that resonant frequency is 2200 KHz. If one adds the 
IF frequency, 1415 KHz in this case, the result is 3.615 MHz.

In every case, the resonant frequency of L-2 is way below the lowest frequency the receiver 
will tune.

Anyone have a clue why this was done?

I really don't understand.

Ken W7EKB