Front Panel; Rear Panel; Side Panel - Kenwood TR-7400A Operating Manual

2.1 FRONT PANEL
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POWER Switch — Turns power on when pressed in.
HI/LOW pushbutton Switch (Refer to the "HOW TO
USE THE HI/LOW SELECTOR SWITCH" section,
page 10). — Used to select high (25W) or low (5W)
RF output Power.
TONE Selector (Refer to the "HOW TO USE THE
TONE SELECTOR SWITCH" page 10). — Four posi-
tion switch used to select type of squelch desired:
SQU: Continuous tone controlled squelch (C.T.C.S.)
on transmit and receive (Optional).
OFF: Carrier Squelch operation.
BUR: Tone burst operation (Optional).
SUB: C.T.C.S. on transmit only (Optional).
Tone Squelch Indicator — A light-emitting diode (LED)
which lights when the TONE Selector is set to the
SQU position.
Meter — Indicates signal strength as an S meter during
receive and relative RF output power during transmit.
The meter function is automatically switched using the
microphone push-to-talk switch.
ON AIR Indicator — A light-emitting diode which lights
during transmit.
Repeater Indicator — A two-color light-emitting diode
which indicates the type of repeater offset. It is red
when the TX OFFSET Switch (7) is set to +600 or
green when the switch is set to —600.
Digital Frequency Display — Indicates receive frequency
only in 6 digits when the POWER Switch 0 is ON.
The display is covered with a smoked acrylic plate.
SQU Control (Outer ring) — This is a normal carrier-
type squelch control which activates the squelch cir-
cuit when turned clockwise.
VOL Control {Inner knob) — An AF volume control
used in the receive mode of operation. Clockwise
turning increases the AF volume.
MIC connector — Accepts the standard 4-pin mic.
plug supplied with the TR-7400A.
MHz Selector Switch — Used to select the desired band.
(144, 145, 146, 147 MHz indicated as 4, 5, 6, and 7
respectively).
100 kHz Selector Switch — Used to select a desired
channel in units of 100 kHz, graduated in 11 positions:
O through 9 and O.
10 kHz Selector Switch — Used to select a desired
channel in units of 10 kHz, graduated in 11 positions:
0 through 9 and 0.
5 kHz Offset Switch — Used to select the least signifi-
cant digit, 0 or 5 kHz, of the channel frequency.
Unlock Indicator, (Refer to Section 4.6 the "DESCRIP-
TION OF UNLOCK INDICATOR", page 12).— A light-
emitting diode, indicates when the PLL circuit is in the
unlock condition. There is no synthesizer output in
the unlock condition. Note, however, that the PLL
circuit is norma! if the indicator lights momentarily
when a channel selector switch is changed.
TX OFFSET Switch (Refer to Section 4.3, the "HOW
TO USE THE TX OFFSET SWITCH", page 9). —
This switch selects the type of frequency offset desired.
+600 kHz switches the transmit frequency
UP 600 kHz from the receive frequency.
SIMP stands for simplex operation.
The receive and transmit frequencies are the
- game.
—600 kHz automatically switches the trans-
mit frequency down 600 kHz from the receive
frequency.
2.2 REAR PANEL
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DC Power Connector — Accepts normal DC operating
voltage through the DC power cord supplied with the
TR-7400A.
Heat Sink — Radiates heat produced by the final tran-
sistors.
ANT Connector — For connection of any 50 ohm 2-
meter antenna.
2.3 SIDE PANEL
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EXT SP Connector — External AF output (8 ohm).
TONE PAD Connector — A tone pad input for "Auto-
patch" operation (600 ohm — Refer to Section 4.7
the "HOW TO USE THE TONE PAD" on page 12.)
Mounting Rail — Used to install the transceiver on the
supplied mounting bracket.
Snap Lock — Used to lock the transceiver body on the
supplied mounting bracket.
Stand-off — Can be attached to your TR-7400A during
operation to provide a convenient angle of viewing for
the operator.