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7-2.
CTCSS unit TSU-6
(TM-621A/721A
only)
The use of the optional sub-audible tone decoder TSU-6 al-
lows for CTCSS (Tone squelch) operations. When this op-
tion is activated the squelch of the SUB band will only open
when the proper sub-audible tone is received.
7-2-1.
Installation
Caution:
Before installation,
be sure to disconnect
the DC power
cord, or damage may result to the transceiver or the unit.
1. Loosen
the
2x2
side
loosen_¥
a
screws.
loosen
I >
2. Remove
the
2
screws
securing the Top cover.
3. Remove
the
2
screws
securing the rear panel.
4. Gently
remove
the
top
cover.
Be
sure
not
to
speaker.
CP
re
5. Remove
the backing from
the
cushion
(small)
that
was
provided
the TSU-6
and attach it to the back
of the TSU-6. (Fig. 2)
6. Attach
the
cable
from
TSU-6
as shown
in the
diagram. (Fig. 3)
7. Remove the backing from
the
other
side
of
the
cushion
and
attach
the
7-2-2.
Operation
1. Press
the
VFO
key
to
select the VFO mode.
2. Rotate the MAIN
Tuning
control,
MHz
key,
or
Microphone
UP/DWN
'
switches
to
select
the
:
desired frequency.
(For
example
146.520
MHz)
displayed.
Rotate the MAIN Tuning
| (O08
YYangn
control,
or
préss.
the':
(=
ss.
Sy
Microphone
UP/DWN
switches
until the desired
ee
tone frequency appears in
[es |
the display.
4. Press
the
VFO
key
to
tur
oon
nnn
return the VFO mode.
146.5
_
33
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