Standard Horizon HX471S, Service Manual

Page: 13 / 66

13
Alignment
Sensitivity & Squelch Threshold (FRS Band)
Press the [
] key to select the display to [
FRS SQL
**
] ([
**
] is “ 00 ” to “ FF ” Hex data). The radio now is in
the Alignment Mode of the Sensitivity & Squelch
Threshold of the FRS Band.
Set the RF signal generator output to 465.1375 MHz, at
a level of –8dBµ with ±3.5 kHz deviation with a 1 kHz
audio tone.
Confirm that the SINAD meter reading is better than –
12dBµ.
Rotate the SQL knob to the 10 o’clock position and
press the [ MENU
] key.
Reduce the RF signal generator output to –13dBµ, then
press the [
SCAN
] key to read the Squelch Threshold
data.
Press the [ SCAN
] key again to save the new setting.
Press the [ MENU
] key to exit this Alignment Mode.
Sensitivity & Squelch Threshold (FM Broadcast Band)
Press the [
] key to select the display to [
WFM SQL
**
] ([
**
] is “ 00 ” to “ FF ” Hex data). The radio now is in
the Alignment Mode of the Sensitivity & Squelch
Threshold of the FM Broadcast Band.
Set the RF signal generator output to 88.100 MHz, at a
level of +5dBµ with ±22 kHz deviation with a 1 kHz
audio tone.
Confirm that the SINAD meter reading is better than –
12dBµ.
Press the [ MENU
] key.
Reduce the RF signal generator output to +7dBµ, then
press the [
SCAN
] key to read the Squelch Threshold
data.
Press the [ SCAN
] key again to save the new setting.
Press the [ MENU
] key to exit this Alignment Mode.
Transmitter Circuit
Set up the test equipment as shown below for trans-
mitter alignment.
Maintain the supply voltage at 8.4V DC for all steps.
Transmitter Output (Marine Band)
Press the [
] key to select the display to [
HIGH
POWER
**
] ([
**
] is “ 00 ” to “ FF ” Hex data). The radio
now is in the Alignment Mode of the Transmitter Out-
put of the Marine Band.
Press the [ MENU
] key to enable adjustment of this
Alignment Mode.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the output
power to 5.0 W (±0.3 W), then press the [ MENU
] key to
save the new setting.
Press the [
] key to select the display to [
MID POWER
**
], then press the [ MENU
] key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the output
power to 2.5 W (±0.2 W), then press the [ MENU
] key to
save the new setting.
Press the [
] key to select the display to [
LOW POWER
**
], then press the [ MENU
] key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the output
power to 1.0 W (±0.1 W), then press the [ MENU
] key to
save the new setting.
Press the [ BAND
] key (Change the frequency display
to 162.025 from 155.000 MHz), then press the [ MENU
]
key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the output
power to 1.0 W (±0.1 W), then press the [ MENU
] key to
save the new setting.
Press the [
] key to select the display to [
MID POWER
**
], then press the [ MENU
] key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the output
power to 2.5 W (±0.2 W), then press the [ MENU
] key to
save the new setting.
Press the [
] key to select the display to [
HIGH
POWER
**
], then press the [ MENU
] key.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the output
power to 4.5 W (±0.3 W), then press the [ MENU
] key to
save the new setting.
Press the [
] key three times to select the display to
[ MARINE DEV
**
], then press the [ MENU
] key. The
radio now is in the Alignment Mode of the TX devia-
tion of the Marine Band.
Set the Audio generator output to 50 mV at 1 kHz.
Press the PTT key to transmit the transceiver, if neces-
sary, press the [
] or [ ] key to adjust the deviation