Icom IC-H12 Maintenance Manual page 5

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A N TE N N A CO N N E CTOR
Connect the su ppl ied flex i bl e anten na. An external anten n a can be used, u si n g a BNC conn ector.
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T R ANSMI T/BATT E R Y IN D I CATOR
I l lu m i nates in the transmit m ode. Also in di cates the battery con dit i on ; du r i n g tra n s m i ss i on .
voltage of N i ckel-Cadmium batteri es drops rapi dl y just before they are exhausted, so when this
in dicator goes out, be sure to i m m ediatel y stop u sing it, and charge the batteries again.
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C HA N N EL S E L E CT SWITCH
Selects on e of the programmed chan nels.
(1)
SQUELCH CO N T R OL
Sets the squ elch threshold level.
coun terclockwise. To set the threshol d l evel higher, rotate the control cl ockwise.
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VOLUME CONT ROL
When the control is turn ed completely countercl ockwise, t he power is OFF. By t u r n i ng the control
cl ockwise beyond the "cl i ck'', the u nit is tu rned ON a n d the a u dio level increases by further rotat­
ing it clockwise.
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E XT E R NAL S P E A K E R JACK
When an exter n a l speaker (or an earphone) is used, con n ect it to t his jack. Use a speaker with an
i mpedance of 8 ohms.
fun ction.
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E XTE R NAL MI C JACK
When an externa l m i crophone is u sed, connect it to this jack. See the schema t i c for the proper
hookup. When the extern a l m i crophon e is conn ected the bu i l t-in m icrophone does not fu nction .
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The I C-CM9 optional speaker-m i crophone can also be used.
Eloct'ot oon doMoc m ;ornphon o
M icrophone
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R =20-30Kn
PTT SWITCH
:8
PUSH TO TALK ( PTT) SW I TCH
..
F or tra nsm ission, press this switch and t a l k into the m i crophon e with normal voi ce. The intern a l
mi crophone i s o f the el ectret-con denser type a n d provi des good pickup for a l l voice l evels .
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CHA R GE R CO N N E CTOR
Connects to t he output plu g of the wal I charger CM-25U/E or other 1 2V DC power sou rce.
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BATTE R Y CHA R GE I N D I CATOR
Lights during battery charging.
To turn O F F the squ elch fu n ct i on , rotate this control completely
and
POW E R SW I TCH
When the extern al speaker is conn ected the bu ilt -i n speaker does n ot
2-2
Dyna m i c m i crophon e
Microphone
PTT SWITCH
The