[CQ-Contest] TS930S vs. DX Doubler

[Rick Tavan]

I have a problem with my TS930 and DX Doubler. "Everything used to work" 
before I removed the 930 from the station and reinstalled it a week 
later using the same Top Ten Devices prefab cable. The 930 is now 
playing a constant monitor tone while connected to the DX Doubler and 
selected as the transmit radio. It is not on the air. I can transmit by 
keying it with the computer or external keyer and I hear the regular 
monitor tone AMing the constant tone. It's as if I have some kind of 
constant low impedance on the key line, enough to key the monitor but 
not the transmitter. A true open circuit doesn't cause the problem and 
connecting the external keyer directly to the rig (bypassing the DX 
Doubler) works fine. The DX Doubler continues to key the FT1000MP just 
fine when the MP is selected for transmit. Does anyone remember a cause 
and cure for this one?

/Rick N6XI