Motorola IC-T81E, IC-T81A Deviation, Hpf Off Lpf, Dtmf, Aus, Sea, Tone Call, Eur, Uk, Ctcss

Page 23

TRANSMITTER ADJUSTMENT (Continued)

The following adjustment must be performed after “REFERENCE FREQUENCY ADJUSTMENT” in SECTION 5-2.

 

 

 

 

 

MEASUREMENT

 

 

ADJUSTMENT

ADJUSTMENT

ADJUSTMENT CONDITION

 

 

VALUE

POINT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNIT

LOCATION

 

 

UNIT

ADJUST

 

 

 

 

 

 

 

 

 

 

 

FM

1

• Displayed frequency :

 

Top

Connect

an

FM

4.5 kHz

LOGIC

R327

DEVIATION

 

51.000 MHz

[EUR], [UK], [ITA]

 

panel

deviation

meter

to

 

 

 

(50 MHz)

 

52.000 MHz

 

 

 

the antenna con-

 

 

 

 

 

[AUS], [SEA], [USA-1]

 

 

nector through

an

 

 

 

 

 

• Connect the audio generator to

 

 

attenuator.

 

 

 

 

 

 

 

the [MIC] connector and set as:

 

 

 

 

 

 

 

 

 

 

95 mV/1.0 kHz.

 

 

 

 

 

 

 

 

 

 

 

• Set the FM deviation meter as :

 

 

 

 

 

 

 

 

 

 

HPF

: OFF

 

 

 

 

 

 

 

 

 

 

LPF

: 20 kHz

 

 

 

 

 

 

 

 

 

 

De-emphasis : OFF

 

 

 

 

 

 

 

 

 

 

Detector

: (P–P)/2

 

 

 

 

 

 

 

 

 

 

• Output power

: High

 

 

 

 

 

 

 

 

 

 

• Transmitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(144 MHz)

2

• Displayed frequency :

 

 

 

 

 

 

 

R325

 

 

145.000 MHz [EUR], [UK]

 

 

 

 

 

 

 

 

 

 

146.000 MHz

 

 

 

 

 

 

 

 

 

 

 

[ITA], [AUS], [SEA], [USA-1]

 

 

 

 

 

 

 

 

 

 

• Transmitting

 

 

 

 

 

 

 

 

 

(440 MHz)

3

• Displayed frequency :

 

 

 

 

 

 

 

R326

 

 

445.000 MHz [USA-1]

 

 

 

 

 

 

 

 

 

 

435.000 MHz [Other]

 

 

 

 

 

 

 

 

 

 

• Transmitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1200 MHz)

4

• Displayed frequency :

 

 

 

 

 

 

 

R338

 

 

1270.000 MHz

 

 

 

 

 

 

 

 

 

 

• Transmitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DTMF

1

• Displayed frequency :

 

Top

Connect

an

FM

3.5 kHz

LOGIC

R322

DEVIATION

 

445.000 MHz [USA-1] only

 

panel

deviation

meter

to

 

 

 

(AUS, SEA,

 

435.000 MHz [AUS], [SEA] only

 

 

the antenna con-

 

 

 

USA-1 only)

 

• Push [D] key while transmitting.

 

 

nector through

an

 

 

 

 

 

• Transmitting

 

 

 

attenuator.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TONE CALL

1

• Displayed frequency :

 

Top

Connect

an

FM

3.5 kHz

LOGIC

R322

DEVIATION

 

435.000 MHz

 

 

panel

deviation

meter

to

 

 

 

(EUR, UK,

 

• Push [center of the multi-func-

 

 

the antenna con-

 

 

 

ITA only)

 

tion] key while transmitting.

 

 

nector through

an

 

 

 

 

 

• Transmitting

 

 

 

attenuator.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CTCSS

1

• Displayed frequency :

 

Top

Connect

an

FM

0.5 – 1.0 kHz

 

Verify

DEVIATION

 

51.000 MHz [EUR], [UK], [ITA]

 

panel

deviation

meter

to

 

 

 

(50 MHz)

 

52.000 MHz

 

 

 

the antenna con-

 

 

 

 

 

[AUS], [SEA], [USA-1]

 

 

nector through

an

 

 

 

 

 

• Tone frequency : 88.5 Hz

 

 

attenuator.

 

 

 

 

 

 

 

• Set an FM deviation meter as :

 

 

 

 

 

 

 

 

 

 

LPF

: 3 kHz

 

 

 

 

 

 

 

 

Apply no audio signal to the [MIC] jack.

Transmitting

(144 MHz)

2

• Displayed frequency :

 

145.000

MHz [EUR], [UK]

 

 

 

 

146.000

MHz

 

 

[ITA], [AUS], [SEA], [USA-1]

 

 

• Transmitting

(440 MHz)

3

• Displayed frequency :

 

445.000

MHz [USA-1]

 

 

 

 

435.000

MHz [other]

 

 

• Transmitting

(1200 MHz)

4

• Displayed frequency :

 

1270.000 MHz

 

 

 

 

• Transmitting

5 - 9

Image 23
Contents Multiband FM Transceiver Sample Order IntroductionOrdering Parts Repair NotesTable of Contents Version 50 MHz 145 MHz 440 MHz 1200 MHz MHz RX only SpecificationsGeneral TransmitterWFM ReceiverBand WFMCPU Inside ViewsLogic Unit RF UnitLogic unit Disassembly InstructionsRemoving the Chassis Panel Removing the Shield Plate Removing the Logic Unit Removing the RF UnitDuplexer Circuit RF Unit Antenna Switching Circuits RF UnitCircuit Description Receiver Circuits7 1ST Mixer Circuit RF Unit Transmitter Circuits APC Control Circuit DRIVE/POWER Amplifier Circuits RF UnitAPC Circuits RF Unit MHz PAVCC Power Supply Circuits Voltage LinePLL Circuits Line DescriptionPin Port Description Number Name Port Allocations1 I/O Expander IC RF Unit IC2 2 I/O Expander IC RF Unit IC3CPU Logic Unit IC1 Connection Adjustment ProceduresPreparation ‘ Required Test EquipmentPLL Adjustment RF Unit TOP View 6MLV RF Unit Bottom ViewULV VLVVHF Receiver AdjustmentDial SensitivityLogic Unit TOP View 101 dBm MeterSSG Top Push and hold MHz bandSQL key Displayed frequencyPush and hold 445.000 MHz USA-1Transmitter Adjustment AUS, SEA DeviationHPF OFF LPF Dtmf=Surface mount Parts ListTrimmer Ceramic ECUE1H121JCQ Transistor UN911D TX Coil Eljnd R10J 0.1U Themistor Ceramic ECUE1H060CCQ Ceramic ECUE1H390JCQ VCO Board Ceramic ECUE1H120JCQ VCO Unit Mechanical Parts and DisassemblyAccessories Chassis PartsMP29 C Diodes SEMI-CONDUCTOR InformationTransistor and FET’S TOP View Board LayoutsLogic Unit GND Pset Ifin Bottom ViewIC1 IC3J4 to Logic unit J1 RF UnitIC6 L912IC2 MP1IC3 VLVCO3 VHF GND VHVCO3 UVCO3 Uhfout GND 12VCO3 GND VCO BoardJ302 to RF unit OUT 12VCOOUTQ354 Block Diagram ANT LPF HPF AMP Mode Xtal BPF PDA2, CK AMPTX/RX Frequency TX/RX BuffANT Buff HPF LPF YGR ResetMode Xtal Initial BPF MOD TX/RX FrequencyLogic Unit Section Voltage DiagramWFM NTCCF20124AH 473KCT TXC 2NDLOOscin Mixin Oscout GND Mixout REC VCC DET Ifin Rssi DEC Ifout Filout QuadCOM4 COM3 COM2 COM1 12VCO COM2 ResetCOM3 COM2 Reset Power Clonein VCC VIN Cpuhv1200M RF UnitVHF 400M400MHz 50M00M 1200MHzLOK GND2 GND1PLST1 IN1 ENB VCC2Icom America Inc Icom Inc 5566I-S