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4. OPERATION
4-1. OPERATING CONTROLS
4-1-1.
Front Panel
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Main Tuning control
This control is used to select the desired transmit/
receive frequency, Memory Channel, Frequency Step,
Tone Frequency, and Scan direction of the MAIN fre-
quency band.
CALL key (TM-621A/721A)
The CALL key selects the CALL channel of the MAIN
frequency band. The frequency has been factory-set as
follows, but may be reset to any desired frequency. (See
CALL Channel P25.)
TM-621A
; 220.000/144.000
T™M-721A
U.S.A. version
; 440.000/144.000
Other market
3; 430.000/144.000
TONE key (TM-721E)
European version:
This key is used to transmit a Tone
signal. When the key is depressed the repeater con-
trol signal of 1750 Hz is activated.
U.K.
version:
This
key
is used
to
activate
the
1750 Hz tone burst.
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VFO key
This key is used to return to VFO operation after oper-
ating in the MR (Memory Recall), or CALL Channel mode
(TM-621A/721A only).
The MAIN tuning control will increase frequency in the
selected step size, the tone frequency (TM-621A/721A
only), and/or the frequency step.
MR/M key
This key is used to select Memory Recall operation af-
ter operating in the VFO or CALL channel mode. The
MAIN Tuning control may be used to select the desired
memory channel in this mode.
VOL control/Power switch
The volume control and power switch are combined.
Rotating the control clockwise will turn ON the tran-
sceiver.
Advancing the control further clockwise will increase
the total volume of two bands. The BALANCE control
proportions the volume among the two bands.
MAIN SQL control
This control is used to select the desired SOL threshold
level of the MAIN frequency band.
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