Albrecht Tectalk User manual

SERVICE MANUAL
2-WAYPORTABLE
HANDHELD PMR
RADIO
TECtalk
Jan. 2000

CONTENTS
1. GENERAL
1.1General
1.2Characteristics andfeatures
2. SPECIFICATION
2.1General Specification
2.2Electrical Specification
3. OPERATION
3.1Pushbuttons
3.2ICONS onLCD
3.3Key Functions
3.4SettingandOperation
4. ADJUSTMENT
4.1Frequency synthesizer
4.2Transmitter
4.3Transmitter test
4.4Receiver
4.5Receiver test
4.6Symptoms,check point& corrections
5. DESCRIPTION OF RADIO CIRCUIT
5.1Frequency Synthesizer
5.2Receiver
5.3Transmitter
6 CHANNELDATA
1. GENERAL
1.1 GENERAL
TECtalk is aminimum sizedtwo-wayportablehandheldradio.
The frequency range is446.00625 ~ 446.09375MHz, 8 UHF operatingchannels
accordingtoEuropeanPMR 446 internationalagreementareavailable.
1.2 CHARACTERISTICS AND FEATURES
a) All activedevices inthis radioaresemiconductors and highdensity IC.
b) Theradiois designedvery compact and theweight isapproximately140gincluding
battery.
c) The unit is equippedwithCPU HD404889 fromHITACHI.
d) Power supply is designedforbattery operation with4cells alkaline(1.5V AAA)
batteriesor
4cells rechargeableNiMH batteriesof thesamesize.

e) Theradiois shippedwithfixed (non-detachable) rubber duck antennaandbelt
clipand carryingstrip.It comeswithout batteries. Other equipment is optional.
2. SPECIFICATION
2.1 GENERALSPECIFICATIONS
a) Frequency Range: 446.00625 ~ 446.09375MHz
b) Output Impedance: 50Ωunbalanced
c) ModulationType: 8K0F3E
d) Communication Mode:semi-duplex
e) Channel Capacity :8channels
f) Channel spacing:12.5kHz
g) Power : 6.0V(alkaline), 4.8V (NiMH)
h) Battery Life:ALKALINE: at1000mAh>30hours (Tx5%, Rx5%, Stand-by90%)
i) OperatingTemperature: -20 degrees C to+60degrees C
j) Dimension: 95.5(H)x 50(W)x 26(D)mm
k) Weight: 132 g(withBattery)
2.2 ELECTRICALSPECIFICATION
a)TRANSMITTER
1) Outputpower : Max. 500mW
2) Frequency Stability : ±5ppm(-20 ~+60 )
3) ModulationMethod:FM
4) Oscillation Method: PLLSYNTHESIZER
5) Max. Frequency Deviation: <+/- 2.5kHz (withtone)
6) Cooling Method: air-cooling Method
7) Spurious Emission : < -36dBm /-30dBm
8) FMHum/Noise: > -40dB (1kHz 60% modulation,w/CCITT)
9) Distortion: < 5% (1kHz 60%modulation)
10) Tx AudioResponse: 6dB/OCT +/- 3dBPRE-EMPHASIS (300Hz~2.5kHz)
b) RECEIVER
1) ReceiveMethod: DoubleSuper Heterodyne
2) ReceiveSensitivity : < 0.28uV(20dB SINAD w/CCITT)
3) SquelchSensitivity :6to8dBat12dB SINAD
4) Bandwidth: > 3kHz(6dBATT point)
5) Selectivity: < -60dB(25kHz)
6) Local Frequency Stability :+/- 5 ppm( between –20degreesC and+60degreesC)
7) Spurious Response: > 40dB
8) Audiooutput:200mW(Internal8Ohms loadTHD 10%) Ext:100mW
9) Distortion: < 5% (1kHz 60%Modulation)
10) RXAudioResponse: 6dB/OCT +/- 3dBDE-EMPHASIS (300Hzto2.5kHz)
11) S/N Ratio:< 40dB (1kHz 60%modulationw/CCITT)

12) IF : 1'st IF = 21.7MHz
2'ndIF = 450kHz
13)Local Frequency :
1st Local Frequency= fc - 21.7MHz
2ndLocalFrequency = 21.25MHz
3. OPERATION
3.1 PushButtons andControls

1) Battery Door
2) Monitor Button
3) DetachableBelt Clip
4) Push-To-Talk (PTT) Button
5) Antenna
6) External Mic / Speaker
7) Built-inSpeaker
8) LCD Panel
9) Built-inMicrophone
10) UpButton& VolumeControl
11) DownButton&VolumeControl
12) FunctionButton
13) PowerOn/Off & EnterButton
3.2 ICONS on LCD
1) RSSI(Receiving SignalStrength Indicator) or TX Bar Icon
Indicatesthereceivingsignalstrengthandblinksduring
transmission.
2) Monitor Indicator
Appears when themonitorbuttonis used.
3) CTCSS Indicator
Blinks whenthe correctCTCSStoneis entered.
4)Auto ChannelScan Indicator

Appears intheautoscan modeor whentheautoscan modeis
activated.
5) DualWatch ScanIndicator
Appears indual watchscanmodeor whenthe dual watchscanmode is
activated.
6) KeyLockIndicator
Blinks inautolockselectionmodeor whenthe key lock is
activated.
7) VOX Indicator
Blinks inVOX selectionmodeor appears whenVOX is activated.
8) BatteryLevelIndicator
Battery Level Meter indicatestheremainingbattery strength.
9) PowerSave Display
Blinks whenthe power saveis activated.
The rateatwhichthe iconblinksvarieswiththepower saving
ratio.
Fast indicatesalowerpower saving whileslow indicatesahigher
Power savingratio.
10)TxIndicator
Appears when asignal is beingtransmitted.
11) RxIndicator
Appears whenasignal isbeingreceived.

12) LargeSegment Display
Indicates the channelnumber inuseat thenormalmode.
When theFunctionButton ispressed, it displays the function menu
insequence:CH / SC / dW/ UO /Udt / ALo/ CAL/ ton
13) Small Segment Display
Displays theCTCSStoneoptionat thenormal mode.
CTCSS option isdisplayedinHz.
Displays theSUBMENU of eachMENU inthefunction mode.
(e.g.CH 1~69/ SC: up,dn/ dW: channel number/
UO: high,off,low/ Udt:5sec, 3sec, 2sec, 1sec/ALo:off, auto/
CALnumber:1-7/ton:no-Freq) 3.3KeyFunction
3.3 KeyFunctions
3.3.1ENTER BUTTON(#13)
1) Short Touch - PowerOn
Press this button(#13)briefly toturntheuniton.
A short confirmingmelodywill play.
2) Long Touch - PowerOff
Press this button(#13)for longer than1.5seconds toturntheunitoff.
Note:Press it toconfirm therequiredoption for respective functionsduring
function editmode.
3.3-2FUNCTIONBUTTON(#12)
1) Short Touch
Press this buttonbriefly toenterfunctionedit modeinstandby mode.
2) Long Touch
Press for longer than1.5seconds toactivatetheKEYLOCK inthe
standby mode.
Pleasenoteall buttonswill bedisabledexceptthe Monitor Button(#2)
andPTTButton (#4) will remainfully operational.
3.3.3UP BUTTON(#10)

1) Short Touch
Inthestandby mode,pressthis button briefly tomovetothenext
higher mainvolumelevel.
Inthe function edit mode,press briefly toshiftfrom thecurrent
option ineachsubmenutothe nextoption inthesamesubmenu.
2) Long Touch
Pressingthis buttonfor morethan1.5secondswill allow you tonavigate
atamorerapidratethroughdifferent volumelevelinthe standby mode
or through different menus inthefunctionedit mode.
3.3.4DOWNBUTTON(#11)
1) Short Touch
Inthestandby mode,pressthis button briefly tomovetothe next
higher mainvolumelevel.
Inthe function edit mode,press briefly toshiftfrom thecurrent
option ineachsubmenutothe previousoptioninthe samesubmenu.
2) Long Touch
Pressingthis buttonfor morethan1.5secondswill allow you to
navigateatamorerapidratethrough different volumelevel inthe
standby mode or throughdifferentmenus inthe functionedit mode.
3.3.5PUSH-TO-TALK (PTT) BUTTON(#4)
Press it firmly andspeak intotheBuilt-inMicrophone (#9) totransmit.
The red TxLED Indicatorattheright side of theLCD Panel (#8) will
be on.
Releaseittoreverttostandbymode.Whenanincomingcall is received,
thegreenRx LED Indicator onthe leftsideof the LCD Panel (#10) will
be on.
Call ToneTransmission
Press thePTT Buttontwicequickly tocall anotherparty onthesame
channel. ThewordCALLandtheTx iconwill appear inthedisplay.
The userselectedcall ringer melody will play.
3.3.6MONITOR BUTTON(#2)
Press it tocheck activity onthecurrent channel beforeyoutry to
transmit.
Adjust the VolumeControl (#10, #11) if necessary.
When youpress theMonitorButton,theLCD Panel (#8) will be illuminated
withanambercolorback-lightand boththeTx andRx LED Indicators will
be on.
Ifyoupress theMonitor Buttonduringthe functioneditmode,youwill
returntostandby modedirectly.

3.3.7EXTERNALMIC/SPEAKER (#6)
This jack accepts anoptional headset/microphone for totally handsfree
operation.
Pleaserefer totheuser manual orAlbrecht catalogue.
SeealsosectionregardingVOX SELECTION MODE.
3.4 SettingandOperation
3.4.1BASIC CHANNEL SELECTION
Inordertocommunicatewithother PMR units,bothyouandthereceiving party
must beonthesamechannel. Tectalk has 8 channels (1-8) asindicated by
thelargedigits intheLCD DisplayPanel (#8).
Before,tryingtotransmit on theselectedchannel, you shouldpress the Monitor
Button(#2) tocheck theactivity onthat channel.
Ifsomeoneis alreadyontheselectedchannel, youshould try another
channel whichis notoccupied.
Tochangethe basicchannel,inthestandbymode,press the
Up Button (#10) briefly tomovetothenexthigher mainchannelnumber.
Press the Down Button (#11) briefly tomovetothe next lower mainchannel
number.
3.4.2CTCSS (Coded ToneControlled SquelchSystem)
SUB-CHANNEL SELECTIONMODE
This featureallowsyoutohavemoreprivacy onthemainchannelbyusingtonecodes
(internationalnumberingsystem00-38)withinamainchannel. This enablesyou to
communicatewithYourpartners on the samemainchannelwhen all partnerstationsuse
the samesubcode.This helpstoavoidcongestion onthe mainchanneland filters out
unwantednoise,static andother stations usingdifferent codes.
Thereare38CTCSS subchannels for eachmain channel.
TochangetheCTCSSsubchannel,
Press theFunctionButton(#12)until thewordcTcappears intheLCD Panel (#8).
Press the UpButton(#10)orthe DownButton (#11)tochoosethe desiredsubchannelto
use.Thecorrespondingsubcodefrequency will be displayedinthelower right corner.
Press theEnterButton(#13) toconfirm your selection.
NOTE:
Tocommunicatewith other PMR units, theymust beswitched to thesame
channel andCTCSSsubcode. Tocommunicate withother LPD units thatdo
nothavesubcodes, switchyour unit tothesamechannel withthesubcode
set toOFF.
3.4.3AUTO CHANNEL SCANMODE
This featureallows youtoscanforan activechannelandcommunicatewiththeparty
transmitting.

Toaccess the Auto ChannelScanmenu,pressthe Function Button(#12)until the auto
channel iconblinks andSCappears inthe LCD Panel (#8).
Press the UpButton (#10)ortheDownButton (#11)tochoosescanningupordownfrom
thecurrent channelnumber.
Press theEnter Button(#13) toconfirm your selection.
The unit will beginscanning foranactivemainchannel. Ifatransmissionis detected,the
Rx andRSSIiconswill appear intheLCD Panel (#8).
Toturnoff the autochannelscanfeatureinthestandby mode, simplypress theFunction
Button(#12)once.
3.4-4DUAL WATCHSCAN MODE
This feature allowsyoutomonitortwo differentchannelsatthesametime. If youpre-set
anypriority channel other thanthe current channelinuse,thepre-setchannelwill be
scannedevery 0.5second andsignals youwhenacall is received.
Toaccess theDualWatchScanmenu,
Press theFunctionButton(#12)until thedual watchiconblinks anddW
appears intheLCD Panel(#8).
Press theUpButton(#10)or theDownButton (#11) to select thedesired
channel number youwishtoclosely monitor.
Press theEnterButton(#13) toconfirm your selection.
Toturnoffthedual watchfeatureinthestandbymode, simplypressthe
FunctionButton (#12) once.
3.4-5VOX SELECTIONMODE
The VoiceActivatedTransmission(VOX) function allows your voicetoactivate
transmissionautomatically whentheCommunicator is usedwithanoptionalhandsfree
mic/headset, orevenwiththe built- inMicrophone.tton(#4)withoutusingthePTT button.
Toaccess theVOX Selectionmenu,
Press theFunctionButton(#12)until theVOXiconblinks andUO appears intheLCD
Panel (#8).
Press theUpButton (#10)ortheDownButton(#11)toselectfromhigh,loworoff.High or
low settingdeterminesVOX responsesensitivity.
Press theEnterButton(#13) toconfirm your selection.
ToturnofftheVOX feature,enter theVOX selection modeandthenselect Off.