HM Electronics BH80074 System 800 Wireless Intercom System User Manual II

HM Electronics Inc System 800 Wireless Intercom System II

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Date Submitted2002-01-17 00:00:00
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Document CreatorDeskScan II
Document Author: billr

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System 800
Wireless Intercom System
Operating Instructions
r: Flu—runny". nu-
INTRODUCTION
The HME System 800 is a UHF wireless intercom system which provides hands-tree
(full-duplex) communication with up to four belt-pat: COMMUNICATOR®s. or push-to-taik
(half-duplex) communication with an unlimited number of Communicators. In combina-
tion, up to three Communicators can be used in the full—duplex mode, with an unlimited
number in the half-duplex mode. its control center. the RW800 Base Station. has inputs
which allows a 2. 3 or 4-wire cabled intercom to be interlaced with the wireless system.
as well as an auxiliary input for a mixer or other audio equipment, Three base stations can
be connected together lor operation of up to twelve Communicators in the full-duplex mode. or
a combination of up to eleven in full-duplex with an unlimited number in the half-duplex mode.
The System 800 was designed for use in television broadcasting. theaters. churches, concerts
and industrial environments.
This manual describes the setup and operation of the HME System 800. Read and follow these
instructions carefully before setting up your System 800 equipment. Pay particular attention to
items in bold or [tells/zed print,
The System 800 is a wireless radio system, type-accepted under
Part 74 and Part 90 of the Federal Communications Commis-
sion (FCC) Code of Federal Regulations governing general
purpose applications. The system requires an FCC station
license if operated within the United States or its possessions.
Because licensing depends on the system‘s application, it is the
user’s responsibility to apply for a license from the Federal
Communications Commission.
The regisrered trademarks used herein, including COMMUNICA TO/ri‘D and the HME logo. are owned by HM Electronics. Inc.
(3 ConwinthFl-rlmmfl in _ mm mm
TABLE OF CONTENTS
I. SYSTEM DESCRIPTION ......................... 1
A Model Designations ........................... 1
B. General Description ........................... 1
C. Special Features ............................ 1
II. SYSTEM SPECIFICATIONS ........................ 2
A. System 600 ............................... 2
B. RWBOO Base Station .......................... 2
C. BHSOO Belt-Pac COMMUNICATOR® .................. 4
III. EQUIPMENT LIST ............................. 5
A. Basic System .............................. 5
8. Optional Equipment ........................... 5
[V‘ SYSTEM 800 CONTROLS AND CONNECTORS ............ 6
A. RW8OD Front Panel ........................... 6
B. RWBOO Rear Panel ........................... 6
c. BH800 Belt-Pas COMMUNICATORQ .................. 7
VA MODES OF OPERATION ......................... 8
A. Full-Duplex ............................... 8
B4 Half-Duplex ............................... 8
C. Combined Full and Half-Duplex ..................... 8
VI. INSTALLATION AND OPERATION .................... B
A, Precautions ............................... 8
B. Installation ................................ 9
1 RWSOO Base Station .......................... 9
2A BHBOO BeIt-Pac COMMUNICATOR0 ................. 10
C. Operation ............................... 11
L RWBOO Base Station ......................... 11
2 BHBOO Belt-Pat: COMMUNICATORa ................. 12
I. SYSTEM DESCRIPTION
A. Model Designations
Model Description
RW800 Base Station BHaoo Belt-Pat:
BHBDO Belt-Pat: COMMUNICATOR“ COMMUNICATORG
RWSDO Ease Stat-on
B. General Description
The HME System 800 is a UHF Wireless Intercom System which provides hands»iree
(full-duplex) communication with up to four belt-pass. or push-to-talk (hall-duplex) com-
munication With an unlimited number of belt-pacs. Combining lull and hall-duplex, up to
three wireless belt-pacs can be operated in the lull-duplex mode with an unlimited number
in the halt-duplex mode. The BHBOO Belt-Pat: COMMUNICATOR®5 transmit to and receive
communication from the RWBOO Base Station. An auxiliary input on the RWBOO Base Station
allows everyone using the System 800 to hear cues from a mixer or other sound equipment.
A cabled intercom can also be connected to the base station. and can be operated in
combination with the wireless system. The RWBOO's modular construction simplifies
service and expansion ol the system.
C. Special Features
' Loop-around sidetones are desrgned into the system to assist in maintaining reliable com-
munication among belt-pac stations. The sidetones ensure that your own voice. as you hear it
in the headset. is being received at the base station and heard by other belt-pac users. it you
do not hear your own voice in your headset, no one else can hear it
' The system is companderizeo to ensure clean. low-noise operation.
' Two System 8005 can be linked to provide up to eight wireless belt-pacs in the iull-duplex
operating mode Three System 8005 provide up to twelve wireless belt-pacs.
' Suoaudible—lone coding is utilized in both transmission directions to prevent outside inter-
lerence.
' A twoway beltclip has been designed to allow the user to either place the belt clip in the down
position and secure it with two screws lor normal-clip operation. or place the belt clip in the up
Dos-tron and secure it with two screws lor use With a webbed belt or equrvalent.
- Electret or dynamic microphone headsets can be used with the beltoacs and/or base stations.
IL SPECIFICATIONS
A. System 800
RF Frequency:
Emission:
Frequency Deviation:
Occupied Bandwidth:
Audio Frequency Response1
Distortion:
Tone Coding:
Operating Temperature Range:
Noise Reduction System:
Range:
RW800 Base Station
Transmit Power:
Frequency Stability:
Spurious Emissions:
Receiver Sensitivity:
3053 Ouieting:
Adjacent Channel Rejection:
RF Squelcn Sensitivity:
Image Frequency Rejection:
Cabled System lnteriace:
Auxiliary Input:
4-Wire Interface:
Power Requirement:
Size.
Weight:
450 a 470MHz (Part 90): 470 - SODMHI (Part 74)
25K6F3E (Unlled States)
16KOF3E (Canada)
isqu maximum
25kHz
2501—11 - 3 SKHz minimum fldB
5‘5 maximum
subaudible
base station — O - 50°C
COMMUNICATOR” — 0 . 40°C
NE570 compandor (or equivalent)
up to 150011 (456.12m) line oi sighli typical
80 - 120mW
iSPPM
SOdBC minimum
1uV lor 12dB SINAD. typical
1.5uV maximum
35GB minimum at $12.5kHz
unsquelched to 25uV minimum
first lF — 21.4MHz. GOdE minimum
second IF — 455KHZ. 45dB minimum
input impedance — 10K!)
receive level -— OdBm maximum
send level — -20dBm
connectors — 1 male 3-pin XLR
1 female vain XLR
pin 1 ~ ground
pin 2 - power (32Vdc maximum)
(and audio 10! 2-wire)
pin 3 - cable audio
impedance — 6000 balanced
receive level —— -2Dd8m typical
connector — 1 female s-pin XLR
pin 1 - ground
pin 2 - audio +
pin 3 » audio -
input impedance — 20K!) balanced
receive level — 5d8m maximum
send level —- OdBrn into 6000
connector —- 1 lemale 4-pin XLR
pin 1 - balanced audio input
pin 2 - balanced audio input
pin 3 - balanced audio output
pin 4 - balanced audio output
external 11 - 30VDC. SOOmA, 115V150 - 60Hz with adapter
rack mount — 19' x 1 72' x 11 50' (48.26 x 4.37 x 29.21cm)
13 lbs (5 eekg)
Operating Frequencies:
Fl" 00
HME
. Duinatnv
_—-!1-
mm-
"m
Imam“—
Auxllllry W B”- Roulvu
to: an mm mm Bu. swim,
[MI——
M“ «379.25qu
_-_ WSW-mm
Prim-r moo Blu station Grou- Snomiuy “no in. 51mm (Gm 1 v
HME
Design-ml
Trammmor U1? 476.0500MH1
Rocolvor A
Racaivlr B
Ric-Ivar c 497.9500MH2
Rec-iv" 0
Steam!- mun Ban Sudan Omn- 2
HME
Dnl mater -
Tumminor 47s mooMHz
1),
Fv-n
470mm“:
__ “macaw:
the v
ueo
492.4000MH1
Prim-r MB“. Simon anon ,
—-!l_ 4701000MH:
Imam—M Ree-Iv" A
Imam—— Rm“ 8
Rmiv-r C uzs 492 B750MH1 Rncolvor c 498 8750MHz
Rocolvlr D U28 493.1750MH1 Hsccivnr D 499.1750MH2
Auxiliary moo But meow"
for an vim: Sooondlry B 0 Simon
HME
9mm
Receiver A
for am. with film. Duo 3mm.
—-m
Basin-my
use
Open“: whllln UHF TV Chamois 15 8: 10
wmhuurrvcnmmlnuu'r
m 493 700mm
HOCOIVII D 493 SZSOMHZ
c. m-rsoo Belt-Par: commumcuonfi’
Audio Frequency Response:
Operating Frequency:
Distortion:
Transmlt Power;
Frequency Stability:
Receiver Sensitivity:
Adjacent Channel Selectivity:
RF Squelch Sensitivity:
Audio:
Headset Connector:
Battery Requirements:
Size:
Weight:
250Hz - 3.5kHz minimum tSdB
450 » 470MHz (Part 90): 470 - 500MHZ (Part 74)
536 maximum
50mW typical at BVDC
10mw minimum at 4,5VDC
110PPM
1|xV for 12d8 SINAD. typical
35GB minimum et112.5kHz
Factory set to 1pV
(internally adjustable irom unsquelched to 251W minimum)
Test signal input - aouv FlF input, 23 5kHz deviation. 1kHz tone
Headphone Impedance Flange — 33 — 2009
Power output —— 20mW minimum across 2009
Maximum SPL level into HME HS: Headset — lzdeA
Subaudible rejection - 5055 mlnimum
4-pin XLR
pin 1 - microphone tow
pin 2 - microphone high
pin 3 ~ earphone low
pin 4 ~ earphone high
NiCad Alkaline
Full-duplex only — 4 hours 9 hours
Typical use — 10 hours 15 hours
standby 153i:
receive 8096
lull-duplex 556
Battery types — NiCad - HME P/N K05645. GOOmAH
rechargeable bettery~pac
Alkaline ~ 4 'AA‘ cells
with battery holder provided
4.6‘ x 4,0” x1.6' (11.68 x 10.16 x 4.06cm)
1301 (3699)
[I]. EQUIPMENT LlST
A.
Basic System
1 ea. BHSDO Bell-Pat: COMMUNICATOR”. with 1 ea battery-par: lor 4 ‘AA' alkaline batteries
1 eat RWBOO Base Station, which includes the following:
Description Quantity
Whip antennas with BNC connectors 2 ea.
AC power adapter (option 115 or 230VAC) 1 eat
Screws for rack mounting 4 ea.
Transmitter Module 1 eat
Receiver Module 1 ea.
Antenna Distribution Module 1 ea.
Optional Equipment
0 Additional BHBOO Belt-Fae COMMUNICATOR°5 tor primary base station
0 Kits ior additional channels tor primary Ins- station.
lnclude receiver module with mounting hardware and BH800 Beit»Pac COMMUNlCATOR°
' Secondary nweoo Bus Station with transmitter, receiver modules and Communicators
to extend the system lor operation oi up to eight lull-duplex, wireless belt-pal: Communicators
Number of Channel:
one (Channel A)
two (Channels A 8. B)
three (Channels A, B 5 C)
lour (Channels A. Bi C a D)
0 Additional BH800 Belt-Pat: COMMUNICATOi-‘tos tor socondary base station
0 Kits for additional channels lor secondary has. station,
include receiver module with mounting hardware and BH800 Belt-Par: COMMUNICATOR’
0 AC Adapter tor RWBOD Base Station (115 volt)
(230 Volt)
0 ACZOOO Battery Charger (6 battery ports. 10 hour charging time)
(115 volt)
(230 volt)
0 AC2010 Quick Battery Charger (3 battery ports. 3 hour charging time)
(115 volt)
(230 volt)
HS? Lightweight Headset
NiCad battery (charged)
Webbed belt. 46' adjustable, black
Cable with 3-pin XLFi connectors. to inleriace two RWSOO Base Stations
25 ft. length
50 it, length
it". SYSTEM 800 CONTROLS / CONNECTORS
A. RW800 Front Panel 11 12 13 14
10
2/ [4 4/5/64} \8\9\
10
Power switch — urns on AC power when top ol switch 15 pressed, oil wnen bottom is pres-
sed‘ LED on SWitcn lights when power 15 on
Headset connector 7 provrdes 4-pin XLR connection ior 33 - 200 ohm headset witn
eleclrel or cynamic microphone.
Microphone switch — turns base-stat on headset microphone on when top 0‘ switch is Dres-
seo oil when bottom is pressed. LED on swtlch lights when microphones on
Headset volume control — advusts volume in base-station headset
Volume control — adiusls VOlu'TlE ol lthl audio from cabled intercom
Intertace Inlout Cabled switch — activates 2 or 3-w re cabled intercom interlece With base
elation when pushed in ceaclivates when out: sWitch shows green n the ‘ln' position
A ¢-wire cabled intercom is not allected by the Interface ln/Out Cableo switch.
Interface In/Out Aux switch ~— activates auxiliary audio input to base statm when pusneo
lni ceaclivales when out: switch shows green in the ‘In' posmon.
Volume control — adjusts volJme ol aux new audio Ianl
Rx Level control — aciusts volume ol receiver lor channel A (same lor cnannels B thru D)
Sq control — adjusts RF squelch threshold level tor channel Ar turning clccxw se
ncreases szJelch lsame tor cnannels B lhru D)
11 -14 Channel A thru D control centers — contain adiustments for up to tour indivi-
aJa' belt-pac channels. A thru D
B, RW800 Rear Panel 22 23
15
16
17
18
17
TX Antenna connector —- BNC connector for transmitting antenna
4~Wire Cabled Intercom connector — iernale Apin XLR connector lor 4-wr’re cables intercom
AUX Input connector — iemale B-pin XLR connector to- auxiliary audio ant
Headset Mlc switch — must be matcned With electrel or dynamic microphone in base
statron headset
19 at 21 Cabled Intercom connectors — lemale and male s-pin XLFl connectors lcr inter-
20
22
23
‘eCing cabled intercom Wit'i wireless intercom System 800
Cabled Intercom Channels 1 a 2 switch — selects eithe' channel 1 or channel 2 cl a
24? re caoled intercom connectec to the Wireless system
11-30VDC, GOOmA Max Input connector — input lor DC pew? adapler
RX Antenna connector — BM: connector lor receiving antenra
22 11-3OVDC. SDOmA Max Input connector — input tor DC power adapter,
23 th Antenna connector — ENC connector for receiving antenna
Top view
c. BHSOO BeltoPac COMMUNICATOR®
OnIOllNqume control -— turns Communicator on and oil. and adrusts listening level In
headset.
Power LED ~ lights green when power goes on. and remains lit until battery needs
replacing or Communicator is turned oil. changes to red when either transmit button
(PTT or LOCK) is pushed indicating transmitter is on,
Adjustable belt clip — when attached to the Communicator in ire down position.
allows the Communicator to be clipped onto the user's belt, when attached to the
Communicator in the up posrrion‘ locks closed lor permanent use with webbed.
uniform belt,
LOCK button — when pushed once, electronically locks the Communicator Into an open
channel 0! communication lor hands-free talking and lislening; when pushed again,
Communicator reverts to listen-only mode.
PTT button — allows open, two-way communication when pushed and held, when button
is released, user can listen only.
4-pln XLR connector — male connector provides headset hookup caoeorlity.
Recelve antenna — receives srgna: from base station.
Battery companmenl cover — slices and hits open lor Battery removal and replacement:
provides access to dynamic/electret microphone switch.
Transmit antenna — transmits sxgnal to base s:ation
V. MODES OF OPERATlON
A.
Full-Duplex
Full~duplex operation provides continuous twcrway communication between the base
station and BHBOO Belt~Pac COMMUNICATOHes, The Communicators each transmit to the
base station on independent irequencies. represented by channels A thru 0 on the base
station.
Half-Duplex
Halt—duplex operation provides push-to-talk (PTI’) communication between the base sta—
tion and an unlimited number oi Communicators. The Communicators typically all transmit
to the base station on the same channel/irequency. since only one Communicator can
transmit at a time. an unlimited number at Communicators can be set up on any of the
channels ior this type operation However, it one operator pushes the PTI' button on his/her
Communicator while the PT'I' button on another Communicator on the same channel is
being pushed, interference will occur
Combined Full and Half-Duplex
Combined operation permits use with any number of belt-pacs in the halt-duplex mode.
and up to three bett-pacs in full-duplex. In combined use. one channel is designated ior
hall-duplex, and the three remaining channels are used for iulI-duplex operation. All of the
FlWBOO Base Station functions still apply. and the sidetone capability is maintained.
VI. INSTALLATION AND OPERATION
A.
Precautions
For the protection oi your equipment and ior maximum operating efficiency, the following
precautions must be understood and observed.
- Do not turn on the RWBOO Base Station without antennas installed.
- Turn oti Communicator beiore replacing batteries,
- Ii other than HME headset is used. be cenain its impedance Is between 33 and 200 ohms
B. Installation
1. RW800 Base Station
The base station can be set up on a table top, or mounted in an audio equipment rack. Four
screws are provided for rack mounting. After setting up the RWSOO in the desired location.
connect all associated hardware and components to it as lollows. Refer to the illustration below.
Front Panel
' Connect a headset to the 4—pin mate XLR oonnector near the left end of the Rwaoo tront panel.
CAUTION: Ii other than on HME headsni will be usod, Its Impedance must be 3.1 - 200 ohms.
Rear Panel [Ieit to right)
' Connect the two antennas to the receptacles marked TX Antenna and RX Antenna at the
Iett and tight ends 0! the base station rear panel. Push each of the bayonette antenna
conectors straight into its receptacle. so the notches on the antenna connector ilts over
the metal tabs on the sides oi the base station receptacle. Holding the antenna upright with
one hand, twist its connector clockwise with the other hand until it is securely in place.
CAUTION: Bo corn/n tho antonnas In both properly Installed bolero connutlny
the power adaptor lo the bit. station.
- Connect any mixer or other audio input equipment to the 3-Din female AUX Input connector.
' Set the Headset Mic switch to the Elec (electret) or Dyn (dynamic) position. depending on
which type of microphone Is in the headset that will be used with the base station.
CAUTION: Do not Invo the hoods" microphone switch on the "slocllet"posltlon when
using a headset with a dynamic microphone, or the microphone may bu damaged.
° Connect any 2 or 3-wire cabled intercom to either oi the Spin male or
female cabled intercom connectors. and/or connect any 4-wire cabled
intercom to the 4pm XLFt connector
commumcnon’
' Set the ChllChZ cabled intercom switch in the Ch2 posinon it “MGM" '
swire intercoms or any HME 700 Series intercom equipment A,,///
is used with the Ftwaoo. For intercom systems which /¢/’ /
have two audio channels. either the Chi or Chz V/f’1/
position can be selected. ,u-/’// /
° Connect the power adapter cord to x'” " Headset ,Cabled /
microphone intercom
the power adapter connector near steer Dyn channel
the right end ol the rear panel at 5mm" WW“
the base station. Plug the adapter
into an AC electrical outlet,
\ TX
antenna
\ Power
adapter
-»~ hector
- If two base stations will be connected
together. remove the cover of the first
(main unit). and locate jumper J12 on
its CItCUil board. Move the J12
shorting bar to position 23.
intercom
intotcwn
z. BH800 Beil-Pac commurtchTon®
Determine whether the headset to be used with the Communicator has an electret or
dynamic microphone. Locate the grid on the battery compartment cover on the bottom of
the BH800. Open the battery compartment by placing a thumb on the grid and sliding the
cover downward to release the catch. Lift the hinged cover and remove the plastic battery
holder from the transceiver. Locate the Headset Mic switch at the bottom oi the empty bat-
tery compartment, and place it in the Elec (electret) or Dyn (dynamic) position, depending
on which type 0! microphone is in the headset.
Insert tour s1andard 'AA' alkaline batteries
into the battery holdert in alternate direc-
tions. with the llal end of each bat-tery
placed against the spring at the end 01
one of the battery compartments.
Replace the lull battery holder in the bat-
tery compartment. inserting the two
metal connectors in the compartment .
first Close the cover over the battery Hfldsa‘ Gm, on'banary
compartment by sliding it inward until it °°"“”'°’ compartment com
snaps securely into place,
Plug the 4-pin iemale XLR connector oi 3°"°"‘ “e“
a headset cable into the male connector
on the bottom or the BHBOO,
NOTE: If other than an HME Irndsot
wlllbo used, be cuteln Its Irri-
pcdanu Is 33 - 200 ohms.
Squeeze
here to
It the belt-pac Communicator is going to up“.
be worn on a standard unitorm or cloth-
ing belt. simply squeeze the belt clip at
the top to open it, and slide it over the Belt dip
belt. The transceiver can be worn at the
lelt or right hip. It it is going to be titted
permanently onto a web!) belt. clip the fig
transceiver over the belt. and slightly
loosen the two screws that can be seen
through the two holes on the clamp.
Do not remove the screws. Slide the
clamp upward until it stops, and
retlghten the two screws. The clamp
should be locked into place so that
squeezing it at the top will not open it.
C. Operation
1. RWSOO Base Station
The base station transmits to all COMMUNICATOR®s on a single UHF channel.
it receives transmission from Communicators on up to tour separate channels. A thru D.
When the base station receives communication from any ol the Communicators. it
retransmits the message back to all Communicators. including the one which trans-
mitted the message. To operate the RWBOO Base Station. do the following.
- Turn on the power by pressing the power switch at the left end of the RWBOO lront panel.
The top hall at the power switch will light when the power is on.
' Adiust the Headset Volume control and the Fix Level (receiver) control ior each channel
being used. to the quarter-level position. They can be readjusted later. as required. Tum
the Fix Level control. tor each channel not being used. lully counterclockwise.
- Adjust the squelch (Sq) control tor each channel to be used (A thru D on the right of the
Ftweoo lront panel), as loliows. Be certain all Communicators are oil. Turn the squelch
control counterclockwise until the red LED light tor that channel comes on. Turn the control
clockwise. just until the light goes oil. It the light flickers dimly. turn the convol slightly fur-
ther clockwise Turn and leave the squelch control tor each channel not being used. lulty
clockwise. Plug a headset into the connector to the right of the power switch.
0 Turn on the headset microphone by pressing the microphone switch to the right oi the head-
set connector. The microphone switch will light when the microphone is on.
- Have one oi the remote Communicators turned on, and have the Communicator operator
speak into his/her headset microphone. Adiust the base-station headset volume control and
the receiver level control (corresponding to the Communicator being used) to the desired
incoming level.
- It a 2 or 3-wire cabled intercom is hooked up to the base station. push the cabled interlace
switch in to activate its interface with the base station. The switch should show green when
the cabled-intercom intertace is activated. Have the cabled-intercom operator speak into
his/her microphone. Adjust the volume control. to the left oi the cabled-interlace switch. to
the desired incoming level. To deactivate the cabled intercom interface with the base sta-
tion. push the cabled interlace switch again. The green should disappear from the switch.
The 4-wire cabled intertace is always enabled.
0 ll auxiliary sound equipment is hooked up to the base station. push the auxiliary-
intertace switch (Aux) in to activate its interlace with the base station. The switch should
show green when the auxiliary interiace is activated. Be certain something is being
transmitted item the sound equipment to the base station. and adjust the volume control.
to the right of the auxiliary-intertace switch. to the desired level. To deactivate
the auxiiiary-sound-equipment interface with the base station. push the auxiliary-
intertace switch again. The green should disappear lrom the switch.
2. 311800 Belt-Pac commumcrrron“
With the belt-pat: on your waist and the headset on your head, turn the Communi-
cator on by rotating the OnIOllNolurne control clockwise to the mid»level position.
Be certain the Power LED lights green when the Communicator is turned on, and
red when either oi the two buttons (LOCK or PTl') on the Communicator is pushed.
II the Power LED does not light, or II It goes all during Communlcator oparatlon,
the battery (or batteries) must be changed. Use the LOCK or PTT buttons to operate
the Communicator in the full-duplex or halt-duplex mode as follows,
- Full~D||plex
To initiate lull-duplex operation. with the Communicator turned on, press the LOCK
button on top of the Communicator once, The Power LED will change to red. Speak
into the microphone and listen for your own voice in the headset Because your voice is
retransmitted from the base station back to you (a leature called "loop-around sidetone‘).
hearing your own voice assures you that the base station is receiving your communica-
tion. Adjust the volume control on the transceiver to a comlortable listening level. To
discontinue full-duplex operation, push the LOCK button once again.
- Half-Duplex
To operate in the hall-duplex (push-to-talk) mode. simply push and hold the PT‘r button
on top at the Communicator while talking. Speak into the microphone and listen for
your own voice in the headset. Because your voice is retransmitted from the base
station back to you (a feature called ‘Ioop~around sidetone'). hearing your own voice
assures you that the base station is receiving your communication, Adjust the volume
control on the transceiver to a comlortable listening level. When you have linished
talking, release the button immediately.

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Title                           : II
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