Hi Mike. This case is measuring well past scope's 3 db point. Expected then the scope would report a lower value than actual in this case. Simple way then is to compare the output at T800 (transmitter RF in) at 2.8 Vp-p to the receiver mixer LO input value of 4.0 Vp-p. The transmit level looks to be nearly correct given the transmitter power, so can then use that value of drive as a baseline to determine if the LO injection at the mixer is reasonable. If Q813 is suspect, need to look at the drain side and see if the scope can display the clipping of the LO drive.?
Paul - W2NMI
