How does it Work?

 

First things first! I'll go over how the CONAR receiver is supposed to work. This will make it easy to understand the modifications needed to make this CONAR begin to earn it's keep in your shack.

This 4 tube receiver is fairly conventional design from the early 60's. Open any ARRL Handbook from that time period and you will see the same design for home built receivers. The "Misers Dream", The "Simple X Super" and the "2X4+1 Superhet" quickly come to mind. The stage lineup for these simple receivers would be:

(1) Mixer

(2) IF amp and BFO

(3) Detector

(4) Audio Amp

(5) Power Supply

 

Like the popular 2 tube regenerative receiver designs of the 1930's, these simple superhets perform surprisingly well given their low parts count.

The CONAR uses four tubes ( 6BE6, 6BZ6, 6U8, 6U8 ) which are very common and inexpensive. The 6 volt filament versions and the 6 volt filament AC Power transformer used are far cheaper than the more popular 12 volt tubes which were produced for the new 12 volt standard AM automobile radios. Reduced demand for 6 volt automobile radios produced a large supply of 6 volt tubes.

 

So without further delay let's get into that CONAR:

 

(1) Mixer

(2) IF amp and BFO

(3) Detector

(4) Audio Amp

(5) Power Supply

 



Complete Schematic for the Conar Model 500 Receiver

Conar Transmitter Manual - and - Conar Receiver Manual