Drake TR7 / TR7A Second Mixer Circuit Board 

C3658H

Later Version

The 2nd Mixer Board serves a dual function depending on transmit or receive. In the receive mode the 48.05Mhz IF signal from the Up-Converter Board is applied to the input of the 2nd Mixer Board. The injection signal for the mixer is the 53.696Mhz signal developed on the Pass-Band Tuning Board. The output of the mixer takes the difference of the two signals, the 5.645Mhz IF signal, filters and amplifies that signal and sends it to the Filter Board.

In the transmit mode the process is reversed. The Mixer Board takes the 5.645Mhz transmit IF signal and mixes that with the 53.696Mhz injection signal from the Pass-Band Tuning Board. The board filters the difference of those two frequencies, and outputs the 48.05Mhz IF signal to the Up-Converter Board.

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