[Milsurplus] BC-603 Assist

[W7QHO at aol.com]

To set the push buttons on the BC-603:

1. Turn the receiver ON and let it warm up.   The TM recommends 15 minutes.   


2. Release the receiver push buttons by partially pressing any one of them.

3. Press the PUSH TO TUNE button and, while holding it in, turn the TUNING 
control toward the high frequency end of the tuning dial until the word LOCK 
appears under the hair line.

4. Insert a screwdriver in the hole above the push buttons and turn the 
locking screw to the left until it binds slightly and then turn it right one-half 
turn.

 (The normal procedure was to adjust any particular channel button to select 
a frequency corresponding to a xtal controlled channel in the BC-604 
transmitter.   If you are operating the 603 alone you will have to provide an 
alternative signal source if a precise frequency setting is required.)

5. Hold in the PUSH TO TUNE button on the receiver and turn the TUNING 
control to zero beat on the desired frequency.

6. Continue to hold in the PUSH TO TUNE button and latch (push in until it 
locks into position) the receiver push button you want to use to return to that 
frequency.

7. Slowly ease up on the PUSH TO TUNE button while maintaining zero beat by 
adjusting the TUNING control as required.

8. Press the latched push button against it's stop two or three times.   If 
zero beat (or close to it) is maintained, depress an adjacent push button 
slightly and carefully ease the latched push button out.   (The TM recommends using 
two fingers for this operation.)

9. If off zero beat at this point, go back and try again.   If OK, go back to 
step 5 to set up another push button.    When setting up multiple frequencies 
the TM recommends starting with the lowest.

10. After the last push button has been set rotate the TUNING dial to the 
LOCK position and tighten the locking screw.

The above derived from TM 11-600, March 25, 1943.

Dennis D. W7QHO
Glendale, CA