[Icom] 775 question

[Jan C. Robbins]

Hi Dick,

The spike you refer to has been present in Icom transceivers at least 
since 751 (incl. 765, 775, 781), and is certainly present in even the 
latest 775's. It is also present in many other mfrs' transceivers. 
While there may be "fixes," proper operation of the transceiver takes 
care of the problem.  For example, Alpha has had a tech note in its 
manuals for years explaining how to properly set up a transceiver to 
avoid that spike.  Here it is from the 87A manual.  Following this 
procedure, I've used a 775 with every Alpha 76 thru 87A, Ameritron 
AL-1500 and Al-800H, Command Tech HF-2500 and 2500HP, Amp International 
LK-800, and many others without incident.

FROM 87A MANUAL--

"Before Operating Your Alpha 87A
1. You must set transceiver power output
properly. The Alpha 87A requires about 50
watts drive for full rated output. Damage
caused by overdriving the ALPHA 87A
will not be covered under warranty.
Fortunately, most modern transceivers
maintain quite consistent output from band
to band and mode to mode if set up properly.
Setting the transceiver POWER or RF
PWR control IS NOT SUFFICIENT.
Several popular transceivers can generate
RF spikes of 200-300W or more unless the
transceiver internal ALC (drive level) is also
adjusted carefully according to its
manufacturer�s instructions. This typically
is done with a knob labeled DRIVE (IC-781,
FT-1000), PROCESSOR OUT (TS-940,
TS-950) or, on SSB when speech processing
is not in use, MIC or MIKE."

vy 73, Jan N0JR