herc444

From    : WA5JRH @ WB5FWE.#COK.OK.USA.NA
Subject : HERCULES 444 MOD REVISED


     About a week ago I put out a bulletin on modification of the
Ten-Tec Hercules 444 regarding operation with other transceivers
than Ten-Tec. I have since found that mod did not completely cure
the problem of overdrive fault on key up (especially when using
vox) .A better fix is to put a time delay in the 12-0 line from
the control board to the display board. This may be easily done
on the control board. Break the 12-0 foil between the display
plug and the mode switch plug on the control board. Install 250
ohm resistor across break. Connect 220mfd cap. from 12-0  on
display plug to -ry on LV SPLY plug. Install 10k resistor across
220mfd cap. This will cause the 12-0 voltage to be reduced to 0
for an instant each time the amp is keyed thereby deactivating
the overdrive fault for that instant.
     If you have futher questions please contact me. Hank
Blackstock WA5JRH @ WB5FWE phone (405)842-8543. Tnx & 73