Transmitter Section; Tx Power Adjustment (Hi Power); Tx Power Adjustment (Low Power) - Standard Horizon HX400 Service Manual

Transmitter Section

TX Power Adjustment (Hi Power)

1. Connect the wattmeter and dummy load to the
antenna jack.
2. Press the [p] or [q] key to
s e l e c t t h e d i s p l a y t o " H
PWR".
3. Press the [SQL] key, then
press the [p] or [q] key to
select a small character of
lower right corner of the dis-
play to "C".
4. Press the [H/L] key to enable adjustment of the
TX Output Power at the band center.
5. Press the PTT key to enable the transmitter
(make sure the DC input voltage to the battery
terminals is at7.4VDC), press the [p] or [q]
key to adjust the output power to 5.0 W (±0.1 W).
6. Press and hold the [H/L] key for 2 seconds to
save the new setting at the band center.
7. Press the [p] key to change
the "C"character to "H" at
the lower right corner of the
display.
8. Press the [H/L] key to enable adjustment of the
TX Output Power at the high band edge.
9. Press the PTT key to enable the transmitter,
press the [p] or [q] key to adjust the output
power to 5.0 W (±0.1W).
10. Press and hold the [H/L] key for 2 seconds to
save the new setting at the high band edge.
11. Press the [q ] key twice to
change the"H" character to
"L" at the lowerright corner
of the display.
12. Press the [H/L] key to enable adjust-ment of the
TX Output Power at the low band edge.
13. Press the PTT key to enable the transmitter,
press the [p] or [q] key to adjust the output
power to 5.0 W (±0.1W).
14. Press and hold the [H/L] key for 2 seconds to
save thenew setting at the low band edge.
15. Press the [H/L] key to exit from this alignment
item.

TX Power Adjustment (Low Power)

1. Connect the wattmeter and dummy load to the
antenna jack.
2. Press the [p ] or [q ] key
to select the display to "L
PWR".
3. Press the [SQL] key, then
press the [H/L] key to enable adjustment of the
TX Output Power.
4. Press the PTT key to enable
the transmitter, press the [p]
or [q] key to adjust the out-
put power to 1.0W (±0.1 W).
5. Press and hold the [H/L] key for 2 seconds to
save the new setting.
6. Press the [CLR(WX)] key to exit from this align-
ment item.
Alignment - 6
Alignment
HX400 Service Manual