I have K2 serial no 03885. I've recently finished building the KSB2 SSB adapter, but I'm having problems getting it to work.
The problem is very low output power when I speak into the mic. I'm using an Icom MK36 mic and I've set the P1 header as per the KSB2 manual; including the resistor to get Mic bias. The options as set SSBA = 2, SSBC = 2-1 and I've done the carrier balance. On 7MHz, LSB, with the power set to 1W, when I "tune" the rig into a dummy load I get 1W, but when I talk or whistle into the Mic, the most I can get is about 100mW. Nomatter how load I yell, I cannot get full output power :-) and the bar graph hardly moves. I've checked all the DC voltages and they are OK. I used a scope on U5 (NE602) and there is an enormous disparity between the voltages on pin 6 (hi) and on pin 1 (very low). The waveform on U3 pin 7 (the compressed AF out) is greater than that on pin 4, (the AF input), but not by much. I want to eliminate the Mic as the source of the problem (It works perfectly with the IC-756 Pro II) by using an AF sig gen, but I'm not sure how much AF drive should cause 100% output power. Gareth - M5KVK ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
