[Yaesu] FT-980 driving an amp problem

[David Thompson]

I have a Dentron DTR-2000L amp that I drive with a Yaesu FT-980.  I use the 
FRB-1 relay box to overcome an older problem with driving an amp that might 
not like QSK on CW.  The FRB-1 also overcame a problem with a delay in 
getting drive to an amp.

Even with the FRB-1 in the keying line I have a delay in the drive to the 
amp.  This happens only on 40 meters.  I have tested the combination on the 
other bands and there is no problem.  I put a IC-740 in place to drive the 
amp and it too works well on all bands except 40 where I have a full 100 
watts barefoot but driving the amp I pnly have 45 watts.  It appears that 
there is a high SWR mismatch on 40.  No special cable is required with the 
Icom but its funny that both the Yaesu and Icom have problems on 40.

I am looking for ther manual and schematic for the DTR-2000L but I don't 
recall the amp having a tuned input but I used the amp with another FT-980 
(with FRB-1) for years with no such problems.

Any ideas?  It does not seem to be RF feedback as the signal reports tell me 
I'M OK.  Sounds Ok in the monitor, too.

73 Dave K4JRB