11
FT-270R/E Technical Supplement
RF Front-end Tuning
1. Connect the DC voltmeter to
TP1031
on the MAIN unit,
then inject a 145.050 MHz signal at a level of +10 dB
μ
(with 1 kHz modulation @±3.5 kHz deviation) from
the RF signal generator.
2. Rotate the
DIAL
knob to select the display to “B0106.”
3. Press the [
F/W
] key, then press the [
MR/MW
(
SKIP
)]
key to set the alignment parameter to “
A1 TUN.xxx
A1 TUN.xxx
A1 TUN.xxx
A1 TUN.xxx
A1 TUN.xxx
.”
4. With in five second of appearing the “
A1 TUN.xxx
A1 TUN.xxx
A1 TUN.xxx
A1 TUN.xxx
A1 TUN.xxx
” on
the display, adjust the
DIAL
knob so that the DC volt-
meter reaches maximum deflection. The
FT-270R
RF
Front-end has a broad bandwidth. Therefore, prior to
adjustment you must adjust the
DIAL
knob to set the
frequency to the middle of the band, in step 2, so you
can set peak in the DC voltmeter’s deflection in the
center of the RF passband.
TX Power Output
1. Rotate the
DIAL
knob to select the display to “B0206,”
then set the transmit power level to “LOW.”
2. Press the [
F/W
] key, then press the [
MR/MW
(
SKIP
)]
key to set the alignment parameter to “
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
.”
3. With in five second of appearing the “
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
”
on the display, press the
PTT
switch to activate the
transmitter, adjust the
DIAL
knob so that the watt-
meter reading is 0.5 Watts (±0.05 Watt).
4. Increase the Transmit power level to “MID.”
5. Press the [
F/W
] key to recall the alignment parameter
“
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
.”
6. With in five second of appearing the “
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
”
on the display, press the
PTT
switch to activate the
transmitter, adjust the
DIAL
knob so that the watt-
meter reading is 2.0 Watts (±0.1 Watt).
7. Increase the Transmit power level to “HIGH.”
8. Press the [
F/W
] key to recall the alignment parameter
“
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
."
9. With in five second of appearing the “
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
A2 PWR.xxx
”
on the display, press the
PTT
switch to activate the
transmitter, adjust the
DIAL
knob so that the watt-
meter reading is 5.0 Watts (±0.1 Watt).
TX Deviation
1. Rotate the
DIAL
knob to select the display to “B0206,”
then set the transmit power level to “LOW.”
2. Press the [
F/W
] key, then press the [
MR/MW
(
SKIP
)]
key to set the alignment parameter to “
A3 DEV.xxx
A3 DEV.xxx
A3 DEV.xxx
A3 DEV.xxx
A3 DEV.xxx
.”
3. With in five second of appearing the “
A3 DEV.xxx
A3 DEV.xxx
A3 DEV.xxx
A3 DEV.xxx
A3 DEV.xxx
” on
the display, press the
PTT
switch to activate the trans-
mitter, adjust the
DIAL
knob so that the deviation
meter reading is 4.2 kHz (±0.2 kHz) (EXP version: 4.5
kHz ± 0.2 kHz).
DCS TX Deviation
1. Rotate the
DIAL
knob to select the display to “B0206,”
then activate the DCS, and set the transmit power level
to “LOW.”
2. Press the [
F/W
] key, then press the [
MR/MW
(
SKIP
)]
key to set the alignment parameter to “
A4 DCS.xxx
A4 DCS.xxx
A4 DCS.xxx
A4 DCS.xxx
A4 DCS.xxx
.”
3. With in five second of appearing the “
A4 DCS.xxx
A4 DCS.xxx
A4 DCS.xxx
A4 DCS.xxx
A4 DCS.xxx
” on
the display, press the
PTT
switch to activate the trans-
mitter (with no microphone input), adjust the
DIAL
knob so that the deviation meter reading is 0.7 kHz
(±0.05 kHz).
Alignment
TP1031
Содержание FT-270R
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Страница 6: ...6 Block Diagram FT 270R E Technical Supplement Note...
Страница 14: ...14 MAIN Unit FT 270R E Technical Supplement Note...
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