Midland X-tra talk LXT560 series User manual

LABORATORY TESTING PROCEDURES

LXT560

Page 1

UNIT TEST - (UNIT ASSEMBLED)

TEST PREPARATION

1) Install 4 AAA Alkaline batteries (observe polarity markings).

2) Turn on unit by pressing the power button.

SYSTEM TEST

1) Radiated Transmit and Re eive performan e may be observed.

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

LABORATORY TEST - (UNIT UN-ASSEMBLED)

TEST PREPARATION

1) Disassemble unit (4 s rews – 2 behind batteries). Remove the PCB from the abinet.

2) Remove the antenna with soldering iron and install a 50 ohm oax able in its pla e.

3) Either lip alligator leads or solder test leads to the power supply onne tions. The

negative terminal is the lower right PCB area. The positive terminal is the lower left

PCB area.

4) Conne t 6VDC power sour e to the terminals, observing orre t polarity.

5) Conne t an 12-ohm load through the Headset ja k

6) Conne t a audio generator with 10uF oupling apa itor through the Headset ja k

7) Sele t desired hannel 1-36 using CH up/down keypad swit h. The rubber keypad

may be removed from the front abinet and used dire tly on the PCB.

LABORATORY TESTING PROCEDURES

LXT560

Page 2

SPECIFIC TEST METHODS AND GUIDANCE

Modul tion Ch r cteristics – (paragraph 2.1047(a) of the Rules)

FOR TX AUDIO FILTER RESPONSE

1. Conne t audio generator with 10uF oupling apa itor to mi rophone input ja k. Press

PTT button.

2. Conne t RF output with modulation meter. (Filters of modulation meter should be set to a

25 Hz to 15 kHz.)

3. Adjust audio generator 6-7mVrms of 1 kHz audio (approx. 0.75 kHz modulation).

4. While transmitting, sweep generator and note measurement.

5. Results should be multiplied by a two times be ause of ompressor.

6. Please ompensate the ba k-ground noise level.

Modul tion Ch r cteristics – (p r gr ph 2.1047(b) of the Rules

FOR TX AUDIO LOW PASS FILTER RESPONSE.

1. Conne t audio generator with 10uF oupling apa itor to mi rophone input ja k. Press

PTT button.

2. Conne t AC voltmeter or other test equipment via jumper wire with jun tion (TP9) of C53,

R82.

3. Adjust audio generator for 200mV.

4. While transmitting, sweep generator and note measurement.

Occupied B ndwidth – (p r gr ph 2.1049(c) of the Rules)

1. Conne t an audio frequen y sweep generator with 10uF oupling apa itor to mi rophone

input ja k.

2. Adjust audio generator to a frequen y of 2500Hz and a level of 51mV rms (+16dB above

8mV per FCC).

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

antenna.

4. Note required measurements per FCC.

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