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the net.
(2) TOD Send.
(a) Frequency selector switches or channel
selector switch — Set to predetermined TOD frequency.
(b) TONE switch — Press. A momentary
1667 Hz tone will be heard, when the TOD message is
transmitted, followed by a 1020 Hz tone until switch is
released.
(3) Emergency TOD Start-UP.
NOTE
The emergency TOD start-up provides an arbitrary
TOD which is not synchronized to
coordinated time. The radio set will not communicate
with any other Have Quick II radio
set in AJ mode unless this new TOD is transmitted
to other radio sets.
(a) Perform step a MWOD Loading
(b) Perform step b (1) Operate Mode
(c) Hundreds frequency selector switch —
Select T and hold while simultaneously pressing TONE
switch. A 1667 Hz tone will be heard when the TOD is
programmed.
(d) TONE switch — Release.
(e) Hundreds frequency selector switch —
Release.
f. Anti-Jam Mode.
(1) Perform paragraph 3-2-6 step Starting.
(2) Load MWOD — Refer to paragraph 3-2-12
step a MWOD Loading.
(3) Receive TOD — Refer to paragraph 3-2-12
step e(1) TOD Receive/Update.
(4) Perform paragraph 3-2-12 step b(1) Operate
Mode.
NOTE
A steady 3125 Hz warning tone will be heard
when the anti-jam (A) mode is selected and
either the WOD is not in the nonvolatile
memory or the TOD has not been programmed.
(5) Hundred frequency selectors switch — A.
(6) Other frequency selector switches — Enter
net number.
3-2-13. VHF AM/FM Radio Sets (AN/ARC-186)
a. One or two VHF AM/FM radio sets (AN/ARC-186)
are installed: No. 1 set on the pilot side of the console, No.
2 on the copilot side. Each set provides communications
in the VHF AM and FM bands. The set operates in the
following modes and frequency ranges: AM reception
between 108.00 and 151.975 MHz, AM receiver and
transmit between 116.000 and 151.975 MHz , and FM
transmit , receive, and homing from 30.000 to 87.975
MHz. Channel spacing is 25 kHz in all bands. Up to 20
channels plus two guard channels can be prestored in
the set (removing power from the set does not affect
stored channels). When the set is used for FM homing
and selected for display on the HSI by the HSI MODE
SELECT panel, steering information will be shown by the
course deviation indicator; homing signal strength will be
shown by the glideslope deviation pointer: and homing
signal adequacy warning will be shown by the glideslope
failure and navigation failure warning flags. The set operates
on 28-volt DC power: No. 1 set receives power from
the DC essential bus through the COMM VHF NO. 1
AM/FM circuit breaker in the No. 2 PDP; No. 2 set receives
power from the No. 1 DC bus through the COMM
VHF NO. 2 AM/FM circuit breaker on the No. 1 PDP..
b. Antenna Select System. Three antennas are
installed as part of the AM/FM radio installation: a top and
bottom communications antenna and a FM homing antenna.
Both AM and FM can be transmitted and received
over the same antenna but not at the same time. Antenna
selection is controlled by the two position VHF ANT SEL
switch on the center instrument panel. The normal switch
position is down at the SYS 2-SYS 1 position. The No. 1
AM/FM set is connected to the top antenna. If a water
landing is to be made or the bottom antenna is damaged,
setting the switch up to SYS 1-SYS 2 reverses the normal
antenna connections and connects the NO. 1 AM/FM set
to the top antenna and the No. 2 AM/FM set to the bottom
antenna. This ensures that secure voice is available
through the top antenna. Power to operate the system is
supplied by the DC essential bus through the VHF ANT
SEL circuit breaker on the No. 2 PDP.
TM 1-1520-240-10
3-2-10
NOTE
The antenna select system has no effect on
the FM homing antenna. The homing antenna
(towel bar) is on the bottom of the fuselage aft
of the cockpit (fig. 3-2-3) and is connected to
the FM set only.
3-2-14. Controls and Function, VHF AM/FM Radio
Set. (fig. 3-2-5)
CONTROLS/
INDICATOR
FUNCTION
Mode Select Switch Three position rotary switch
used to select radio operating
mode. Power is applied to radio
in all positions except OFF.
OFF Power to set is disabled, radio
is inoperative.
TR Radio operates in the transmitreceive
mode.
DF Radio operates in the direction
finder mode.
Frequency Control/
Emergency Select
Switch
Four position rotary used to
select radio frequency tuning
mode.
EMER AM Radio is tuned to AM Guard
　
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