Drawing: Cobra Drawing: Cobra

UHF Radio

Drawing: UHF control head

AN/ARC 164 UHF/AM Radio Set

Control / Indicator Function
1. PRESET Underneath the frequency card (2) which is held closed by a clip on the left hand side, the pilot can preset 20 different frequency channels.
2. Channel frequency card Provides space to record selected frequency.
3. CHAN window Indicator selected channel.
4. Channel selector knob Selects preset channel.
5. Frequency selector  Selects desired frequency.
6. Mode selector
         MANUAL Frequency selected with frequency selector knob.
         PRESET Selects preset channel as desired by CHAN selector.
         GUARD Frequency is automatically positioned to guard channel (243.00).
7. Squelch
         OFF Received unsquelch.
         ON Received squelch operating.
8. VOL knob Adjusts audio volume.
9. TONE pushbutton When pressed, audio tone indicated proper receiver performance.
10. UHF knob
         OFF Power off.
         MAIN Main receiver on, transmitter in standby.
         BOTH Main and guard receiver on, main transmitter in standby.
         ADF Not used.


The AN/ARC-164 provides two way UHF amplitude modulated (AM) narrow band voice communications within the frequency range of 225.00 to 399.95 MHz on 3500 channels for a distance of approximately 50 miles as limited by conditions. A guard receiver is incorporated in the set and is fixed tuned to 243.00 MHz. Both receivers are disabled during transmitter operation. The radio set control panel is marked UHF and located in the pilot right console. The UHF radio transmitter and main receiver operate on the same frequency and are simultaneously tuned by frequency selector knobs on the panel. When the function selector switch is placed in the BOTH (#10) position, constant monitoring of the UHF guard frequency (243.00 MHz) is possible regardless of main receiver-transmitter frequency selected. The set utilizes selector switch (#6 position number 2) of the interphone control panel.

The UHF set is used for transmission and reception. The audio signal level is adjusted by the volume control and the signal is then applied to the interphone control panels for selection. When the No. 2 receiver switch is on, the audio signal level is further adjusted by the interphone control panel volume (VOL) control and is fed to the headset. When the No. 2 transmit position is selected and the microphone switch is pressed, the microphone output is amplified in the audio control panel and applied to the UHF command transmitter. Side tone audio is routed back to the headset in the same way as receiver audio.

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Updated: 12 January 2008
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