Operating Frequencies

These parameters are: frequencies, type of modulation, and whether the link is unsecured or secured.

a. Operating Frequencies. The Radio Sets will operate in either the VHF or UHF frequency bands. The AN/URC-

100 and AN/URC-101 VHF range is from 116.000 MHz to 149.975 MHz and the AN/URC-104 VHF ranges are

from 30.000 MHz to 87.975 MHz. All three of the radio's UHF ranges are from 225.000 to 399.975 MHz. Eight

frequencies may be selected from either or both bands and stored in function selector switch positions 1 through

6, GD A, and GD B radio channel. However, when the communication link requires different transmit and

receive frequencies, the receive frequency must be assigned to channel 1 and the transmit to channel 2. These

frequencies will remain in storage until changed, even with the radio power turned off.

b. Carrier Modulation. All radios in the communications link must be set for the same type of modulation. All

three Radio Sets will operate with AM or FM at UHF frequencies. The AN/URC-100 and AN/URC-101 radios will

also operate with AM or FM at the VHF frequencies. However, the AN/URC-104 will only operate with FM at the

VHF frequencies.

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