Ericsson NPC-50 Bedienungsanleitung PDF herunterladen (Seite 12)

UHF ALIGNMENT

ALIGNMENT OF TRANSMITTER - (UHF)

TEST EQUIPMENT REQUIRED

a. DC POWER SUPPLY (7.5V, more than 3A)

b. RF WATTMETER (more than 10 Watt)

c. DUMMY LOAD FOR SPEAKER (50 Ω more than 10 Watt)

d. FM LINEAR DETECTOR

e. FREQUENCY COUNTER

f. AF OSCILLATOR

ALIGNMENT CONDITION

a. CHANNEL : 1

b. MODE : TX

c. MODULATION FREQUENCY : 1 kHz

d. LOAD IMPEDANCE : 50 Ω

ALIGNMENT PROCEDURE

See Figure 2 for setup of test equipment.

STEP TEST CONDITION MEASUREMENT ADJUSTMENT REMARKS

NO MODULATION

RF WATTMETER RT501 3.8W ± 0.05W *

2 FREQUENCY

COUNTER

CT301 461.000 MHz ± 100 Hz

MOD : 1 kHz

LEVEL : 100 mV

FM LINEAR

DETECTOR

HPF: OFF

LPF: OFF

DE-EMPHASIS: OFF

RT202 ± 4.0 kHz DEV ± 0.01 kHz

4CH6

NO MODULATION

↑

RT701 ± 700 Hz DEV ± 10 Hz

(Tone Freq. = 67.0 Hz)

5CH7

↑

RT201 ± 700 Hz DEV ± 10 Hz

(Tone Freq. = 250.3 Hz)

6CH6

↑

--------- If DEVIATION is not ± 700 Hz DEV

± 30 Hz back to STEP 5.

7CH1

MOD : 1 kHz, 100 mV

↑

RT202

(CHECK)

± 4.0 kHz DEV ± 0.05 kHz

8CH4

NO MODULATION

↑

RT701

(CHECK)

± 700 Hz DEV ± 30 Hz

(Tone Freq. = 167.9 Hz)

POWER ADJUSTMENT TIME IS LESS THAN 5 SECONDS.

ALIGNMENT OF RECEIVER - (UHF)

TEST EQUIPMENT REQUIRED

a. DC POWER SUPPLY (7.5V, more than 2A)

b. RF SIGNAL GENERATOR

c. DUMMY LOAD FOR SPEAKER (8 Ω, more than 1 Watt)

d. SINAD METER

e. AF OSCILLATOR

ALIGNMENT CONDITION

a. CHANNEL : 2

b. MODE : RX

c. SQUELCH (RT001 : SQ. VR) : C.C.W.

d. RF SSG MODULATION : 1 kHz, ± 3 kHz DEV.

e. RF SSG FREQUENCY : 438.05 MHz

f. AUDIO SIGNAL OUTPUT LEVEL : 50 mW (0.63 Vrms)

(AT SPEAKER TERMINAL)

ALIGNMENT PROCEDURE

See Figure 3 for setup of test equipment.

STEP TEST CONDITION MEASUREMENT ADJUSTMENT REMARKS

RF SSG

LEVEL :0.15 uV

OSCILLOSCOPE

(AUDIO OUTPUT)

RT001 ADJUST RT001 TO THE POINT

WHERE AUDIO OUTPUT WAVE-

FORM WILL APPEAR

CHANNEL: 4

RF SSG

LEVEL: 1 mV

MOD: 167.90 Hz

DEV:

700 Hz

TP601 RT601 ADJUST RT601 TO

0.9Vp-p

AE/LZB 119 1658 R1A

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