Yaesu FT-2800M, Technical Supplement

10

Entering the Alignment mode

Alignment of the FT-2800M is performed using a front-
panel software-based procedure. To perform alignment
of the transceiver, it must first be placed in the “Align-
ment Mode,” in which the adjustments will be made and
then stored into memory.

To enter the Alignment mode:
1. Press and hold in the [

LOW

] key and [

D/MR

] key

while turning the radio on. Once the radio is on, re-
lease these two keys.

2. Press and hold the [

MHz

] key for one second to acti-

vate the “Set” (Menu) mode.

3. Rotate the 

DIAL

 knob to select “

35 D/ASMT

,” then

press the [

MHz

] key.

4. You will now note the appearance of “

REF

” on the

display, this signifies that the transceiver is now in
the “Alignment mode.”

PLL Reference Frequency (REF)

1. Tune the transceiver to 146.000 MHz.
2. Set the transceiver to Alignment mode, then rotate the

DIAL

 knob to set the Alignment parameter to “

REF

.”

3. Press the 

PTT

 switch to activate the transmitter, and

press the [

REV

] or [

D/MR

] key, as needed, so that

the counter frequency reading is 146.000 MHz.

4. Press and hold the [

LOW

] key for one second to save

the new setting.

5. Press and hold the [

MHz

] key for one second to exit

to the normal operation.

PLL VCO

1. Connect the DC voltmeter to 

TP-RVC

 on the RF Unit.

2. Tune the frequency to 146.000 MHz.
3. Adjust 

L330

 on the RF Unit for 1.5 V on the DC volt-

meter.

4. Connect the DC voltmeter to 

TP-TVC

 on the RF Unit.

5. Press the 

PTT

 switch to activate the transmitter, and

adjust 

L329

 on the RF Unit for 1.3 V on the DC volt-

meter.

RF Front-end Tuning
(TUN137/TUN146/TUN160/TUN173)

1. Connect the DC voltmeter to the Test Point (

RSSI

:

Pin 6 of J307) on the RF Unit.

2. Tune the transceiver to 137.050 MHz.
3. Set the transceiver to Alignment mode, then rotate the

DIAL

 knob to set the Alignment parameter to

“

TUN137

.”

4. Inject a 137.050 MHz signal at a level of –5 dB

μ

 (with

1 kHz modulation @ ±3.5 kHz deviation) from the
RF Signal Generator.

5. Press the [

REV

] or [

D/MR

] key for maximum deflec-

tion of the DC voltmeter.

6. Press and hold the [

LOW

] key for one second to save

the new setting, then press and hold the [

MHz

] key

for one second to exit to the normal operation.

7. Tune the transceiver to 146.050 MHz.
8. Set the transceiver to Alignment mode, then rotate the

DIAL

 knob to set the Alignment parameter to

“

TUN146

.”

Alignment

RF UNIT A

LIGNMNT

 P

OINTS

L329

RSSI

L330

TP-TVC

TP-RVC