The purpose of this modification is to eliminate the tendency of the VOX relays to “hang up”.  The idling current through the relays is reduced to a value considerably below the drop-out point to which the relays have been adjusted.  Additionally, this modification will permit operating a push-to-talk switch against ground.

1-Unsolder the ground wire and capacitor from the antenna relay coil terminal and remove both.

2-Feed a 5.5” length of insulated wire through the grommet and solder one end to the relay coil.

3-Remove R151, 18K 2W from the terminal strip adjacent to the output shield compartment.

4-Remove R152, 8.2K 2W resistor from the terminal strip and replace with a 91K 2W resistor.

5-Solder the other end of the wire installed in step #2 to the terminal strip lug to which the red wire is connected.

6-Install a 220 ohm 1/2W resistor between the lug to which the orange/white lead is connected and the lug to which the yellow/red lead is connected.

7-Remove both blue leads and capacitor C161, a .01 mfd from pin #8 of V107B.

8-Remove the orange/white lead and C149, a .22 mfd from pin #6 of V107B and solder the wire to pin #8 of V107B.

9-Install a 1.5K 1/2W resistor from pin #8 of V107B to ground.

10-Locate the blue lead which connects to the VOX relay K102 and solder it to pin #6 of V107B.

11-Solder the other blue lead to ground near V107B.

12-Remove the red/yellow lead and C147, .22 mfd, from pin #7 of V107B.  Lengthen the lead of the capacitor and connect to pin #8 of V106.  Cut the red/yellow lead back to the cable run.

13-Remove the jumper between pin #8 of V106 and pin #7 of V107B and install a 470K resistor in its place.

14-Replace R148, 470K 1/2W with a 1 meg resistor.

15-Remove the red/yellow lead from terminal 2 of TB101, cut it short to the cable run and install a 2.5” wire between terminal 2 of TB101 and the yellow/red wire on the terminal strip at junction of the yellow/red wire and the 220 ohm resistor.

16-Remove C210, .005 mfd disc and R154, a 10 meg 1/2W from terminal 1 of TB101 and other lug.

17-Ground terminal 1 of TB101.