TM 1-1520-240-MTF4-6415. HF Radio (AN/ARC-220)/COMSEC (KY-100).a. AN/ARC-200 Function switch — T/R. Modeswitch — PRE and Channel selector —Appropriate preset (1-20) containing afrequency to transmit /receive in USB.b. KY-100 — Mode switch — PT. Preset —Desired position for plaintext operation.Plaintext beeps are heard when system isidle or receiving.c. Transmit/Receive and evaluatecommunications throughout a 360 degreeturn.d. Repeat the process with ARC-220operating on LSB, AME and CW.e. KY-100 — Mode switch — CT, Preset —Desired position for ciphertext operation.f. Transmit/Receive with ARC-220 operatingon LSB, AME or CW.g. ARC-220 — Mode switch — ALE,SQLswitch — 0 or 1.h. Push PTT.i. ARC-220 displays “CALLING”j. Wait for a short gong tone and “LINKED” ondisplay before transmitting to a likeconfigured station.k. ARC-220 — Mode switch — ECCM.Channel switch — Desired channel, SQLswitch — 0 or 1.l. Transmit to a like station by pressing PTT,wait for preamble tones to cease and begintransmission.
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