AN/ARC-73
DH4PY

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  AN/ARC-73

is an air band transceiver, built by Collins Radio Co.
The radio set consists of:

  • R-1123A (51X2B) receiver,
  • T-879 (17L-7A) transmitter,
  • C-4074 (614U) control unit and
  • MT-2699 mounting.

    Both transmitter and receiver use tubes and transistors.
    The control unit has a mechanical frequency display, receiver and transmitter are remote- controlled by a 7- wire cable; the crystals in the oscillator circuit are switched mechanically.

    The radio set comes from an out of order Noratlas. It was mounted to a board covered by aluminium (to simulate the hull of the plane). Between 1973 and 1979 it was used in a DO-27 of the BW flying sports group to communicate with civilian air fields. (The Do-27 had no equipment for these frequencies).
    By using the aluminium plated board, the original Collins fin antenna could be used: the duoband- antenna 37R-2U.
    The antenna elements are printed circuits, the plastic housing of the antenna is filled with plastic foam.

    Frequency range:
    Transmitter 116 ... 149.95 MHz
    Receiver 108 ... 151.95 MHz

     

    Technical data radio:
    HF output:
    25 W
    Channel spacing:
    50 kHz
    Number of channels:
    Transmitter 680
    Receiver 720
    Mode:
    AM
    Antenna impedance:
    52 Ohm
    Sensitivity:
    3 µV
    NF:
    100 mW @ 500 Ohm
    Powered by:
    27 V; 7.5 A
    Technical data antenna 37R-2U:

    Frequency ranges:
    116 to 152 MHz (VHF);
    225 to 400 MHz (UHF)
    Maximum power:
    35 W per band
    Impedance:
    50 Ohm
    Standing wave:
    less than 2:1 over both ranges
    Polarisation:
    Vertical
    Connectors:
    BNC for VHF, TNC for UHF
    Measurements:
    66.71 x 95.25 x 292.10 mm