Specifications

Page 15

FIGURE 3. BLOCK DIAGRAM, TRANSMIT MODE.

FIGURE 4. BLOCK DIAGRAM, RECEIVE MODE.

The signal from the VFO Amplifier is initiated in the transistorized VFO/Buffer circuit comprised of Q1 and Q2. The signal from the

VFO is routed to the VFO Amplifier and is mixed with the single sideband from the IF amplifier, resulting in output in the 10 meter

band. When the transceiver is in the TRANSMIT mode, the gain of the First IF Amplifier is controlled through the Automatic Level

Control (ALC) network (using the AGC Amplifier Vl0) to control the gain of the stage in response to the average input power to the

Power Amplifier. This ALC system will compensate for extremely strong input signals, but does not completely eliminate the

necessity of proper adjustment of the MIC GAIN control. This feature will help prevent the transmitter from flat topping and

generating spurious emissions, but considerable distortion may occur if the MIC GAIN control is not properly adjusted. Refer to

Operating Instructions.

TUNE OPERATION

Normally, the frequency of the carrier oscillator is approximately 300 Hertz outside the 6 db passband of the crystal lattice filter. In

TUNE position, the frequency of the carrier oscillator is moved approximately 800 Hertz to place it well within the passband of the

crystal lattice filter.

RECEIVE

In RECEIVE position, or at any time when the transmitter is not in TRANSMIT, all circuits used in transmitting are disabled through

circuits controlled by relay K1. The relay is energized for transmitting and dc-energized for receiving. One contact, when de-

energized, allows received signals from the antenna to be applied, through the transmitter tank circuit, to the receiver R. F. Amplifier,