Improved carrier feed thru rejection is achieved for a linear amplifier in a transmitter. The DC training capabilities of a radio frequency mixer are used, not only to correct DC offset of the radio frequency mixer, but also to adjust the DC offset of any baseband circuit and filtering coupled to the radio frequency mixer. Output power adjustment is accomplished by adjusting a feedback attenuator in the feedback path of the radio frequency mixer. Constant loop gain is maintained by adjusting a forward attenuator in the forward path of the radio frequency mixer. The feedback and forward attenuators have a fine adjustment on the order of less than 5 dB.