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4-1-2. Rear Panel
+
14
ANT (Antenna) connector
Attach an antenna with an impedance of 50 ohms to
this connector (PL-259).
A for 144 MHz
B for 220 MHz (TM-621A)
430 MHz, 440 MHz (TM-721A/721E)
13.8 VDC power input connector
Connect the supplied DC Power Cable to this connec-
tor. Pay close attention to the polarity (the DC Power
Cable is color-coded; red is positive and black is nega-
tive), when connecting the cable to the power source.
Fuse holder
Contains a fuse (10A)
SP (Speaker) jack
This jack is for connection
of an
8-ohm
external
speaker.
4-1-3.
Microphone
U.S.A. version only
@ and (@) UP/DWN (Up/Down) switches
These switches are used to step the VFO frequency or
Memory
Channel
up and down.
The frequency
will
change continuously if the switches are pressed and
held.
@®_ PTT (Push To Talk) switch
The transceiver will be placed into transmit whenever
this switch
is pressed.
Operations such as scanning
will be cleared when this switch is pressed.
@) 16-Tone DTMF Keypad (U.S.A. version only)
Used to activate the DTMF encoder. See Section 4-4
REPEATER for additional information on this item.
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