Topband: Loud clicks

[Larry]

Lately I have noticed loud clicks on the on the first dit of a transmission on a few stations. We just went through that same problem with W8UVZ and discovered that his TR relay was going bad on the amp. After replacing the TR relay we discovered the rig was keying too fast for the amp (xmt delay) thus hot keying the amp. It also caused the first dit to be distorted or missing altogether. Some of the older amps have slower open frame relays. BTW we found exact replacement relays at Digikey. The clicks remained even after replacing the relay.


Here is what we discovered after replacing the amp TR relay. The amp TR relay operates at 20ms, the Yeasu FT1000d operates at 12ms and the K3 default is 8ms. The K3 was reprogrammed to 16ms and the problem went away, However the FT 1000d xmt delay cannot be changed. I found a simple circuit to speed up the TR relay on the amp (see www.k6xx.com ) fast relay for details. This circuit brings the amp operating speed to approx 10ms without damaging the relay. If you have a K3 just go into the xmt setup menu and change the xmt delay to 16ms. This should prevent any damage to your amp relay and or tubes. The Yaesu Ft1000mp has a programmable xmt delay in the CW break in setting. Menu 7-4

                  73 es HNY Larry W8VVG