Yaesu FT-8900R, Техническое дополнение

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12
Alignment
Entering the Alignment mode
Alignment of the FT-8900R is performed using a front-panel
software-based procedure. To perform alignment of the trans-
ceiver, it must first be placed in the “Alignment Mode,” in which
the adjustments will be made and then stored into memory.
To enter the Alignment mode:
1. Press and hold in the “Left” band [
V/M
] key and the
Hyper Memory [
6
] key while turning the radio on.
Once the radio is on, release these two keys.
2. Press the front panel keys in the following sequence.
“Left” band [
LOW
]
à
“Left” band [
V/M
]
à
“Left” band [ HM
]
à
“Left” band [ SCN
]
à
“Right” band [ LOW
]
à
“Right” band [ V/M
]
à
“Right” band [ HM
]
à
“Right” band [ SCN
].
3. You will now note the appearance of “
A-0 REF.xxH
”
on the display, this signifies that the transceiver is now
in the “Alignment” mode.
PLL Reference Frequency (A-0 REF)
1. Press the “Sub” band
DIAL
knob momentarily, if
needed, to switch the “Main” band to be the “Left”
band.
2. Tune the “Left” band frequency to 52.050 MHz.
3. Press and hold in the in the “Right”
DIAL
knob, if
needed, to set the Alignment parameter to “
A-0
REF.xxH
.”
4. Press the
PTT
switch to activate the transmitter, and
adjust the “Right”
DIAL
knob, as needed, so that the
counter frequency reading is 52.050 MHz (±10 Hz).
5. Press the “Right”
DIAL
knob momentarily to switch
the “Main” band to be the “Right” band.
6. Tune the “Right” band frequency to 435.050 MHz.
7. Press the
PTT
switch to activate the transmitter, and
adjust the “Left”
DIAL
knob, as needed, so that the
counter frequency reading is 435.050 MHz (±100 Hz).
RF Front-end Tuning (A-1 TUN)
1. Connect the DC voltmeter to
R1168
on the MAIN Unit,
then inject a 439.050 MHz signal at a level of +10 dBµ
(with 1 kHz modulation @ ±3.5 kHz deviation) from
the RF Signal Generator.
2. Press the “Sub” band
DIAL
knob momentarily, if
needed, to switch the “Main” band to be the “Right”
band.
3. Tune the “Right” band frequency to 439.050 MHz.
4. Press and hold in the in the “Left”
DIAL
knob to set
the Alignment parameter to “
A-1 TUN.xxH
.”
5. Adjust the “Left”
DIAL
knob, as needed, so that the
DC voltmeter reading is 1.1 V.
6. Tune the “Right” band frequency to 145.050 MHz.
7. Inject a 145.050 MHz signal at a level of +10 dBµ (with
1 kHz modulation @ ±3.5 kHz deviation) from the RF
Signal Generator.
8. Adjust the “Left”
DIAL
knob, as needed, so that the
DC voltmeter reading is 1.2 V.
8. Press the “Left”
DIAL
knob momentarily to switch the
“Main” band to be the “Left” band.
9. Connect the DC voltmeter to
R1180
on the MAIN Unit.
10. Tune the “Left” band frequency to 439.050 MHz.
11. Inject a 439.050 MHz signal at a level of +10 dBµ (with
1 kHz modulation @ ±3.5 kHz deviation) from the RF
Signal Generator.
12. Adjust the “Right”
DIAL
knob, as needed, so that the
DC voltmeter reading is 1.1 V.
13. Tune the “Left” band frequency to 145.050 MHz.
14. Inject a 145.050 MHz signal at a level of +10 dBµ (with
1 kHz modulation @ ±3.5 kHz deviation) from the RF
Signal Generator.
15. Adjust the “Right”
DIAL
knob, as needed, so that the
DC voltmeter reading is 1.2 V.
R1168
R1180
MAIN UNIT T
EST
P
OINTS