Notice the front view of receiver R-19 TRC1 which illustrates the controls on the front panel. At the upper left corner are the receiver output terminals used in four-wire radio remote control to connect the high fidelity output to a remote control unit. Most of the other controls at the left of the control panel concern the AC power circuit.
The AC line brings power into the receiver. The PUSH FOR LINE CHECK switch can be used when the meter switch, at lower center of the panel, is on position 6. The AC line voltage is then indicated by the meter, above the meter switch. The LINE ON-OFF switch is the main power switch. The lamp beside the line switch lights when power is applied.
Radio Receiver R19 TRC-1, Front View
The other controls provide for control of the receiver speaker and the squelch circuit. The MUTE switch, in the ON position, permits the handset at the transmitter to short out the receiver speaker when the transmitter is being modulated through the handset. This facilitates point-to-point communication within the system. The SQUELCH ON-OFF switch permits use of the squelch circuit as desired. The SQUELCH ADJUST provides screwdriver adjustment of the gain of the RF and IF stages for proper squelch action.
There is no tuning control on the panel. The set is tuned by inserting the proper crystal into the HFO and tuning the RF and high IF tuned circuits, with the help of the meter readings.
The presence of a carrier signal is indicated by the meter, or by the lamp to the right of the meter switch. Multichannel or single channel operation of the high fidelity circuit can be selected by the next switch to the right. The audio gain of the high fidelity circuit can be screwdriver adjusted by the AUDIO GAIN control. A switch for disconnecting the receiver speaker, with its low audio channel, is next to the right. The speaker volume control permits the regulation of the amplitude of the low audio channel carried by the receiver speaker. The control cable connector provides for connection of the receiver output to the transmitter terminal unit. At the far lower right corner is the ANT. INPUT connector for connecting a concentric transmission line between receiver and antenna. A screwdriver adjustment directly above uhe antenna connector permits the tuning of the antenna to adjust it to the various frequencies in the receiver's range.
Editors note: Readers who are not familiar with modern single-sideband radio technology may wish to skip this section, which describes early SSB systems of the 1950's, and uses terminology of that time.
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