Hi Folks, K2 #767 has had the KSB2 module installed for several years - tested, but hardly used since installation. Testing today revealed that power output drops from 10w to <2w pep after a few words. Checked voltage readings on the SSB board - all OK except AUX BUS remained at 5.6v during transmit, rather than falling to 2.4v as per the manual. After some head-scratching, I changed the display from RF to ALC - maybe the output was being reduced? However, as long as the display is on ALC the power output is 10w PEP (Tektronix 2213 60mHz scope across 50 ohm dummy load) - AUX BUS drops to 2.4v on transmit. Changing the display back to RF yields >2w output - both conditions are repeatable. CW operation is not affected - steady 10w on the scope whether the display is RF or ALC. So far, I haven't figured the link between toggling the display between RF and ALC, and power output. Before I get out of my depth, has anyone else come across this problem? 73, Ken _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft
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