[TenTec] Keying lockup, the saga continues

[Ken Brown]

>
> Another interesting thing I found in the 253 manual is that the relay, 
> K6, which is used to break the keying loop, is on the KW BRIDGE PAD 
> BOARD. This board has the SWR bridge on it, and full Titan RF power 
> goes through it. So there may be a significant path for RF to get into 
> the keying loop, regardless of how good my cables are. I'll test this 
> theory by just not connecting the 253 in the keying loop. In the long 
> term though, I want the safety of having the 253 able to prevent the 
> Omni from keying. So I'll have to do something else. Perhaps an 
> external relay that is activated by K6. I don't know what the solution 
> will be, and I'll keep you posted as the saga continues.

Removing the 253 from the keying control loop seems to have stopped the 
lockup problem. Now I have to come up with a good way to restore the 253 
ability to stop keying in the event of a fault condition detected by the 
253, without bringing back the lockup problem. Anyone been down this 
path already? Suggestions?

Ken N6KB