Figure 2-16. Transmitter frequency mixer stage 1A9, schematic diagram.

TM 11-5820-695-35

Figure 2-16. Transmitter frequency mixer stage 1A9, schematic diagram.

Crystal mixer 1A9A1 uses varactor diode

resonant circuit L1, and C1, C6. This circuit is tuned to

the 15) MHz if frequency and is used to tune out the

OR1 to provide frequency conversion (due to the

varactor capacity at the if frequency. Isolation of rf from

nonlinear capacitance-voltage relationship of the

varactor diode). ,Resistors Re and R3 provide bias

the if cir-

return for CR1. The 1,50 MHz fm signal is applied to

jack J1 and is coupled to the mixer cavity through

2 -75