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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,
Caution:
Installation
1, Loosen
the
2x2
side
screws.
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
disconnect
the
wire
to
speaker.
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
loosen ?
loosen
Z sae
Cushion (small)
cushion
and
attach
the
TSU-6 to the transceiver.
8. Route the wiring as shown
in the diagram. (Fig. 4)
Chemical
5
condenser
Fig. 4
the installation.
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)
3. Press the F key and then
ated
oc
46520 rao
33
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