Standart HX290U, Service Manual

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(j) At this point, confirm that the CTCSS deviation is
between ± 0.35 kHz and ± 0.6 kHz
(k) At this point, confirm that the TX frequency is between
+ 1 kHz and - 1 kHz.
In case you find any deviation in the frequency ,Adjust
the trimmer XP01(TCXO) on the condition (25°C ±
2°C)that is controlled by thermal.
Note : All subsequent adjustments should be performed
with the case attached.
- Transmission power adjustment -
(a) Switch off the transceiver's power switch and activate
the adjustment mode.
(b) Set the transceiver channel to 01. While holding down
the LAMP key, press the H/L key to set the
transmission power to high.
(c) Put the transceiver into the transmit mode.
(d) Adjust channel knob so that the transmission power is
4.3 W.
(e) After adjustment, return the transceiver to receive status.
(f) Without changing the channel setting, while holding
down the LAMP key, turn the channel knob to set the
transmission power to low.
(g) Put the transceiver into the transmit mode.
(h) Adjust channel knob so that the transmission power is
1.2 W.
(i) When the transmission power is high, confirm that the
transmission power is 3.8 W – 4.8 W at the channel of
00 and 02.
(j) When the transmission power is low, confirm that the
transmission power is 0.8 W – 2.0 W at the channel of
00 and 02.
(k) When the adjustment is complete, power off the
transceiver. The transceiver reverts to the normal mode.
4.3.3 Receiver Block
- Reception sensitivity confirmation -
(a) Set the transceiver channel to 01.
(b) Set the standard signal generator (SSG) as follows.
Frequency : see Table 4-1
Standard modulation frequency : 1 kHz
Standard frequency deviation : ± 3.0 kHz(Wide)
Standard frequency deviation : ± 1.5 kHz(Narrow)
(c) At this point, confirm that 12 dB SINAD is approximately
–7 dBµ(emf).
(d) Confirm that 12 dB SINAD is –5 dBµ(emf) or less at
the channel of 00 and 02.
(e) Confirm that 12 dB SINAD is –5 dBµ(emf) or less at
the channel of 04.(Narrow)
- Squelch sensitivity adjustment -
(a) Switch off the transceiver's power switch and activate
the adjustment mode.
(b) Set the transceiver channel to 01.
(c) While holding down the LAMP key, press the MONI
key to display "sqL-tH" on the LCD. (threshold squelch
adjustment mode)
(d) Set the standard signal generator (SSG) as follows.
Frequency : see Table 4-1
Standard modulation frequency : 1 kHz
Standard frequency deviation : ± 3.0 kHz
Output level : –10 dBµ(emf)
(e) Press the MONI key.
(f) While holding down the LAMP key, press the MONI key
to display "sqL-tI" on the LCD. (tight squelch adjustment
mode)
(g) Set the SSG output level to –2 dBµ(emf).
(h) Press the MONI key.
(i) When the adjustment is complete, power off the
transceiver. The transceiver reverts to the normal mode.