Midland X-TRA TALK LXT110 Series Handbuch

LXT110

ALIGNMENT PROCEDURE

Page 1

1. REFERENCE TEST EQUIPMENT

A. HP8921A Cell site test set or HP8920A, B Communication Test Set with Spectrum

Analyzer option.

B. Fluke 187 Digital Voltmeter

C. HP E3615A Power supply

2. TEST POINT

A. ANTENNA : Test point is not prepared. Use antenna contact with

ANTENNA_GND_T(antenna ground).

B. VCO reference voltage : Test point TP1 is prepared.

C. RX audio output : Test point SPKOUT is prepared or use ear-jack(3.5mm).

D. TX Mic. Input : Test point MICIN is prepared or use ear-jack(2.5mm) with 10uF

coupling capacitor.

E. Battery Vcc : Test point TP2 is prepared.

F. Up Key : Test point UP is prepared.

G. Down Key : Test point DW is prepared.

H. Function Key : Test point Menu is prepared.

I. Monitor Key : Test point SCAN is prepared.

J. PTT Key : Test point PTT is prepared.

Note. : All key can be activated when connect with ground.

3. VCO ALIGNMENT

A. Set unit to Channel 1 and connect a voltmeter to TP1 (VCO PD).

B. Press & hold PTT.

C. Extend L303 until the voltmeter reads 1.2V.

D. Cover shield-plate on VCO can and monitor the voltage on TP1. The voltage should be

1.2Vdc +/-0.2Vdc. If the voltage is not 1.2Vdc +/-0.2Vdc, realign L303 until meet to

requirement.

E. Release PTT button so units is in receiving mode and monitor the voltage on TP1. The

voltage should be in the range 1.0Vds +/-0.3V

F. Set unit to channel 14.

6. Press & hold the PTT switch and observe the voltage on TP4. The voltage should be 1.5 –

2.5 Vdc.

7. Release PTT and observe the voltage on TP4. The voltage should read between 1.5 - 2.5

Vdc.

Note : VCO shield-can should be soldered after VCO alignment is finished.

4. TRANSMITTER FREQUENCY ALIGNMENT

A. Press & hold the PTT button.

B. Align CT201 trimmer capacitor such that the output frequency is equal to the channel

frequency with a maximum error of +/- 200 Hz. CT201 is located on the left side of

20.95MHz X-tal.

LXT110

ALIGNMENT PROCEDURE

Page 2

5. TRANSMITTER OUTPUT POWER CONFIRMATION

A. Set unit to channel 1 and power Hi mode.

B. Press & hold the PTT button.

C. Transmit power should normally be between 0.35W to 0.8W.

D. Set unit to channel 14.

E. Press & hold the PTT button. Ensure that Tx Power should be between 0.35-0.8W.

6. TRANSMITTER DEVIATION ALIGNMENT

A. Connect an audio generator (600 ohms) to the ear jack. The audio frequency should be set

at 1KHz with a level of 200mV RMS.

B. Connect an FM deviation meter (communications test set) to Antenna contact. Set the

monitor to read peak to peak divided by two [(pk-pk)/2] deviation. Set filter of equipment

from 25Hz to 15KHz.

C. Press & hold the PTT button.

D. Align RV2 for +/- 2.0 kHz deviation (+/-0.1KHz). RV2 is located on the bottom of the VCO

shield can.

E. Decrease audio generator level until deviation reads +/- 1.5 kHz (approximately 7mV) and

record generator level. Level should be between 4 mV and 10 mV.

F. Confirm that transmit audio distortion is less than 5%.

7. RECEIVER ALIGNMENT

A. Set the output level of the RF signal generator for -47dBm. The generator should be set for

1.5 kHz deviation at 1 kHz audio.

B. Set volume level 4 (It is initial.).

C. Connect Audio analyzer to SPKOUT.

D. Set equipment filter 25Hz to 15KHz.

E. Confirm that Rx Sensitivity is less than –119dBm (nominally –121dBm) by reducing the

output level of the RF signal generator until a 12 dB SINAD reading is achieved.

F. Set signal generator level to –47dBm.

G. With 1.5KHz deviation at 1KHz modulation, set volume for maximum audio. Audio level

should be on over than 1.4Vrms.

8. BATTERY INDICATOR CONFIRMATION

A. Set unit to receiving mode. Don’t set transmitter mode..

B. Set power supply voltage to 4.5V.

C. Decrease power supply voltage until low battery icon blinks.

9. POWER OFF CURRENT CONSUMPTION

A. Set power supply voltage to 6V and connect to unit.

B. Confirm current. It must be less than 300uA.

10. FREQUENCIES TABLE

Channel Freq. MHz Channel Freq. MHz

LXT110

ALIGNMENT PROCEDURE

Page 3

1 462.5625 12 467.6625

2 462.5875 13 467.6875

3 462.6125 14 467.7125

4 462.6375 15 462.5500

5 462.6625 16 462.5750

6 462.6875 17 462.6000

7 462.7125 18 462.6250

8 467.5625 19 462.6500

9 467.5875 20 462.6750

10 467.6125 21 462.7000

11 467.6375 22 462.7250

LXT110

LABORATORY TESTING PROCEDURES

Page 1

UNIT TEST - (UNIT ASSEMBLED)

TEST PREPARATION

1) Install 3 “AAA” alkaline batteries (observe polarity markings).

 Right middle terminal is the system plus polarity

 Left bottom terminal is the system minus polarity.

2) Press the power button.

SYSTEM TEST

1) Radiated Transmit and Receive performance may be observed.

2) Audio out & Audio in are available at the Headset jack.

LABORATORY TEST - (UNIT UN-ASSEMBLED)

TEST PREPARATION

1) Disassemble unit (6 screws – 2 behind batteries). Remove the PCB from the

cabinet.

2) Remove the antenna and install a 50 ohm coax cable in its place.

3) Either clip alligator leads or solder test leads to the power supply connections. The

positive terminal is the lower left PCB mounting hole. The negative terminal is the

lower right PCB mounting hole top of the 20.95MHz X-tal. (battery side view)

4) Connect 4.5VDC power source to the terminals, observing correct polarity.

5) Connect an 12-ohm load through the Headset jack (3.5mm mono-phone plug).

6) Connect a audio generator with 10uF coupling capacitor through the Headset jack

( 2.5mm mono-phone plug).

7) Select desired channel 1- 22 using CH up/down keypad switch. The rubber keypad

may be removed from the front cabinet and used directly on the PCB.

LXT110

LABORATORY TESTING PROCEDURES

Page 2

SPECIFIC TEST METHODS AND GUIDANCE

Modulation Characteristics – (paragraph 2.1047(a) of the Rules)

FOR TX AUDIO FILTER RESPONSE

1. Connect audio generator with 10uF coupling capacitor to microphone input jack.

Press PTT button.

2. Connect RF output with modulation meter. (Filters of modulation meter should be

set to a 50Hz to 15KHz.)

3. Adjust audio generator about 3-5mVrms for 0.75KHz modulation.

4. While transmitting, sweep generator and note measurement.

5. Please compensate the back-ground noise level.

Modulation Characteristics – (paragraph 2.1047(b) of the Rules

FOR TX AUDIO LOW PASS FILTER RESPONSE.

1. Connect audio generator with 10uF coupling capacitor to microphone input jack.

Press PTT button.

2. Connect AC voltmeter or other test equipment via jumper wire to TP9.

3. Adjust audio generator for 200mV.

4. While transmitting, sweep generator and note measurement.

Occupied Bandwidth – (paragraph 2.1049(c) of the Rules)

1. Connect an audio frequency sweep generator with 10uF coupling capacitor to

microphone input jack.

2. Adjust audio generator to a frequency of 2500Hz and a level of 100mV rms (+16dB

above 10-12mV per FCC).

3. With a spectrum analyzer, transmit the radio and monitor the transmitter though an

antenna.

4. Note required measuements per FCC.

LXT110

PRODUCTION SPECIFICATION

Page 1

1. GENERAL SPECIFICATION

Items Specifications

1 Tx Frequency range 462.550MHz ∼467.7125MHz

2 Tx VCO Frequency range Same as item 1

3 RX Frequency range Same as item1

4 RX VCO Frequency range 441.150MHz ∼446.3125MHz ( Lower Heterodyne )

5 Channel Number

Channel Spacing 22CH

12.5KHz

6 Frequency Control PLL Synthesizer with Temperature Compensated Crystal

Reference

7 IF frequencies 21.4 MHz for 1’st IF

450KHz for 2’nd IF

8 Modulation FM (F3E emissions)

9 Standard Test Modulation signal Modulated audio Frequency : 1KHz

Test modulation : +/-1.5KHz

10 TX Frequency stability Max. +/-2.5ppm ( -20℃to +50℃)

Nominal test temperature Range 25℃+/- 5℃

Extreme operating temperature

Range -20℃to +50℃

12 Antenna Impedance 50 ohm +/- 25 ohm

13 Power source 3 AAA Alkaline batteries or

3 AAA Ni-HM rechargeable batteries

Test Power Supply Voltage 4.5Vdc. +/-0.1Vdc

14 Extreme Supply Voltage Range 3.0Vdc to 5.0Vdc

15 Battery life time ( Typ. 5/5/90 duty) Min. 35 Hours

16 Microphone Self contained Electret

17 Speaker Self contained 8 ohm

LXT110

PRODUCTION SPECIFICATION

Page 2

2. DETAILED SPECIFICATION

A. RECEIVER SECTIONS * Normal test condition *

TYP. LIMIT

1. MAXIMUM USABLE SENSITIVITY

* 1KHz +/-1.5KHz DEV.

* REF. CHANNEL 1 & 8

-122dBm

<-119dBm

2. 20dB QUIETING SENSITIVITY

* 1HKz +/-1.5KHz DEV.

* REF. CHANNEL 1 & 8, 12dB SINADDER

-116dBm

<-114dBm

3. ADJACENT CHANNEL TWO SIGNAL

SELECTIVITY & SENSITIZATION

* +/- 1 CHANNEL SPACING

>50dB

4. INTER-MODULATION SPURIOUS RESPONSE

ATTENUATION

>50dB

5. SPURIOUS EMISSIONS

* CONDUCTIVE CONNECTION

<-53dBm

6. RECEIVE FREQUENCY RESPONSE

* REF. 1KHz +/-1.5KHz DEV.

300Hz

3KHz

-4.0dB

-17.0dB

+/-2.0dB

+/-3.0dB

7. AUDIO OUTPUT LEVEL

* REF. 1KHz +/-1.5KHz DEV.

* (No LOAD )

* Volume Max.

1.5V

>1.4V

8. AUDIO OUTPUT DISTORTION

* REF. 1KHz +/-1.5KHz DEV.

* ( No LOAD ) 3% <5%

9. MAX. S/N RATIO

* REF. 1KHz +/-1.5KHz DEV.

* ( No LOAD ) 36 dB >30dB

10. RX VCO REF. VOLTAGE

* REF. CHANNEL 1

* REF. CHANNEL 8

1.0V

2.0V

+/-0.3V

11. SQUELCH THRESHOLD

* REF. 1KHz +/-1.5KHz DEV.* 9dBsinadder -3dB - +3dB

16. CURRENT CONSUMPTION

* Un-squelched Volume Max.

* Squelched

* Power Off

200mA

35mA

200uA

+/-40mA

<40mA

<300uA

LXT110

PRODUCTION SPECIFICATION

Page 3

B. TRANSMITTER SECTIONS

TYP LIMIT

1. TRANSMITTER FREQUENCY TOL.

* REF. CHANNEL 1 <+/-200Hz

2. TRANSMITTER RF POWER

* REQUIRED CONDUCTIVE CONNECTION

* REF. CHANNEL 1 Hi Power (DC4.5V)

0.6W

+0.2W / -0.3W

3. TRANSMITTER OCCUPIED BANDWIDTH

* REQUIRED CONDUCTIVE CONNECTION

* REF. CHANNEL 1 @12.5KHz

<-50dBC

4. TRANSMITTER SPURIOUS

* REQUIRED CONDUCTIVE CONNECTION

* REF. CHANNEL 8

<-50dBC

5. MODULATION SENSITIVITY

* REF. 1KHz AUDIO

* CHANNEL 1 , @+/-1.5KHz 7mV +/-3mV

6. MODULATION LIMITING

* REF. 1KHz AUDIO, CHANNEL 1

* (INPUT AUDIO ; 200mVrms) +/-2.0KHz +/-0.2KHz

7. MODULATION AUDIO DISTORTION

* REF. 1KHz AUDIO +/-1.5KHz 3% <5%

8.TX AUDIO FREQUENCY RESPONSE

* REF. 1KHz AUDIO, CHANNEL 1

* ( INPUT AUDIO ; 3mVrms )

300Hz

3KHz

6KHz

-15.0dB

+6.0dB

-16.0dB

+/-3.0dB

9. TX MODUALTION S/N

* REF. 1KHz AUDIO, CHANNEL 1

* ( REF. INPUT AUDIO ; 12mVrms ) 35dB >30dB

10. TX VCO REF. VOLTAGE

* CHANNEL 1

* CHANNEL 14

1.5V

2.5V

+/-0.3V

11. CURRENT CONSUMPTION

* DC 4.5V Power Hi 400mA +/-150mA

LXT110

TX AUDIO TEST RESULT

Page 1

Frequency Response of Audio Low Pass Filter (150mV input)

3K 4K 5K 6K 7K 8K 9K 10K 15K 20K

#1 0 -8.15 -15.8 -21.1 -25.4 -28.7 -32.4 -34.9 -46.5 -51.5

#2 0 -8.20 -16.2 -21.3 -25.7 -29.2 -32.5 -35.3 -46.7 -52.1

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