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Ok....I have a question. I think I have located the intermittent problem around IC5 (mixer). When I test IC5 with my DMM, I have correct voltages on all pins (as per the service manual). Pin 2 is the output and even though I have .469v rx and 7.93v tx off pin 2, I don't have the RF level of .357v coming off pin2 using the RF probe and I do not have the 85mv tx  RF level off the one leg of C163 and on down the line towards the base of TR39 (pre-driver). Does this mean that IC5 is defective?