Standart HX290U, Руководство по обслуживанию

Страница: 19 / 40

18
4.3 HX290UKA Adjustment and Confirmation
4.3.1 PLL Block
- Reception PLL lock voltage adjustment -
(a) Set the transceiver channel to 02 and set the
transceiver to receive status.
(b) Connect a voltmeter to TP(Test Point) and adjust
CV14 so that the voltage at TP (+ terminal of CP15) is
4.0 V ± 0.1 V.
(c) Set the transceiver channel to 00.
(d) Confirm that the voltage at TP (+ terminal of CP15) is
HX290UKA131 : 1.2 V – 2.0 V
HX290UKA191 : 0.8 V – 1.6 V
HX290UKA181 : 0.7 V – 1.5 V
HX290UKA111 : 0.6 V – 1.4 V
- Transmission PLL lock voltage adjustment -
(a) Set the transceiver channel to 02 and set the
transceiver to transmit status.
(b) Connect a voltmeter to TP(Test Point) and adjust
CV04 so that the voltage at TP (+ terminal of CP15) is
4.0 V ± 0.1 V.
(c) Set the transceiver channel to 00.
(d) Confirm that the voltage at TP (+ terminal of CP15) is
HX290UKA131 : 1.4 V – 2.2 V
HX290UKA191 : 1.4 V – 2.2 V
HX290UKA181 : 1.3 V – 2.1 V
HX290UKA111 : 0.9 V – 1.7 V
4.3.2 Transmitter Block
- Maximum deviation adjustment -
(a) Set the transceiver channel to 01.
(b) Input a 1 kHz, 80 mV sine wave to the transceiver
from the audio generator (AG). Switch the transceiver
to the transmit mode.
(c) Adjust RM50 so that the maximum deviation is ± 4.2 kHz.
- Tone deviation balance adjustment -
(a) Switch off the transceiver's power switch and activate
the adjustment mode.
(b) Set the transceiver channel to 09.
(c) Set the HPF of the modulation analyzer to off and the
LPF to 3 kHz.
(d) Do not input an audio signal from the audio generator
(AG) and set it to no-modulation status.
(e) Put the transceiver into the transmit mode and monitor
it using an oscilloscope.
(f) At this point, adjust RM52 so that the waveform is a
square wave.
(g) When the adjustment is complete, power off the
transceiver. The transceiver reverts to the normal mode.
- Deviation confirmation (Wide) -
(a) Set the transceiver channel to 01.
(b) Input a 1 kHz, 80 mV sine wave to the transceiver
from the audio generator (AG). Switch the transceiver
to the transmit mode.
(c) At this point, confirm that the maximum deviation is
± 3.5 kHz – ± 4.5 kHz.
(d) Gradually reduce the output level of the audio
generator (AG) until deviation is ± 3 kHz. At this point,
confirm that the audio generator (AG) sine wave
output level is between 5 mV and 11 mV (OPEN).
(e) While holding down the PTT switch, press the "8" key
of the numeric keys.
(f) At this point, confirm that the DTMF deviation is
between ± 2.0 kHz and ± 4.0 kHz.
(g) Set the transceiver channel to 08.
(h) At this point, confirm that the DCS deviation is
between ± 0.5 kHz and ± 1.0 kHz.
(i) Set the transceiver channel to 06.
(j) At this point, confirm that the CTCSS deviation is
between ± 0.5 kHz and ± 1.0 kHz.
- Deviation confirmation (Narrow) -
(a) Set the transceiver channel to 04.
(b) Input a 1 kHz, 80 mV sine wave to the transceiver
from the audio generator (AG). Switch the transceiver
to the transmit mode.
(c) At this point, confirm that the maximum deviation is
± 1.8 kHz – ± 2.4 kHz.
(d) Gradually reduce the output level of the audio
generator (AG) until deviation is ± 1.5 kHz. At this
point, confirm that the audio generator (AG) sine
wave output level is between 5 mV and 11 mV
(OPEN).
(e) While holding down the PTT switch, press the "8" key
of the numeric keys.
(f) At this point, confirm that the DTMF deviation is
between ± 1.0 kHz and ± 2.0 kHz.
(g) Set the transceiver channel to 09.
(h) At this point, confirm that the DCS deviation is
between ± 0.35 kHz and ± 0.6 kHz.
(i) Set the transceiver channel to 07.