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4. OPERATION
4-1.
OPERATING
CONTROLS
4-1-1.
Front Panel
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(@) Main Tuning control
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VFO key
This control
is used to select the desired transmit/
This key is used to return to VFO operation after oper-
receive frequency, Memory Channel, Frequency Step,
ating in the MR (Memory Recall), or CALL Channel mode
Tone Frequency, and Scan direction of the MAIN fre-
(TM-621A/721A only).
quency band.
The MAIN tuning control will increase frequency in the
@
CALL key (TM-621A/721A)
selected step size, the tone frequency (TM-621A/721A
The CALL key selects the CALL channel of the MAIN
only), and/or the frequency step.
frequency band. The frequency has been factory-set as
@
MR/M key
follows, but may be reset to any desired frequency. (See
This key is used to select Memory Recall operation af-
CALL Channel P25.)
ter operating in the VFO or CALL channel mode. The
TM-621A
; 220.000/144.000
MAIN Tuning control may be used to select the desired
TM-721A
memory
channel in this mode.
U.S.A. version
; 440.000/144.000
® VOL control/Power switch
Other market
+ 430.000/144.000
The volume control and power switch are combined.
TONE key (TM-721E)
Rotating the control clockwise will turn ON the tran-
European version:
This key is used to transmit a Tone
sceiver.
signal. When the key is depressed the repeater con-
Advancing the control further clockwise will increase
trol signal of 1750 Hz is activated.
the total volume of two bands. The BALANCE control
U.K.
version: This
key is used
to activate
the
proportions the volume among the two bands.
1750 Hz tone burst.
©
MAIN SOL control
This control is used to select the desired SOL threshold
level of the MAIN frequency band.
10
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