Yaesu FT DX 9000MP CONTEST - DATA MANAGEMENT OPERATION, Operation Manual

Page: 101 / 180

Page 99 FT
DX
9000MP O
PERATION
M
ANUAL
SSB/AM M SSB/AM M
SSB/AM M SSB/AM M
SSB/AM M
ODE ODE
ODE ODE ODE
TTTTT
RANSMISSION RANSMISSION
RANSMISSION RANSMISSION RANSMISSION
(L(L(L(L(L
OOOOOWWWWW
- D - D
- D - D
- D
IST IST
IST IST
ISTOR OR
OR OR
ORTION TION
TION TION
TION
CLASS-A O CLASS-A O
CLASS-A O CLASS-A O
CLASS-A O
PERA PERA
PERA PERA
PERATION TION
TION TION
TION
)))))
Q Q Q Q Q
UICK UICK
UICK UICK
UICK
P P P P P
OINT OINT
OINT OINT
OINT
Class-A operation provides a significant improvement in transmitter distortion suppression. During Class-A, the
3rd-order IMD products are typically suppressed 50 dB, while the 5th- and higher-order IMD products (that can
cause “splatter” that interferes with others) will typically be suppressed 70 dB or more.
If you are using a linear amplifier such as the
VL-1000 , the low distortion produced by the FT
DX
9000MP ’s
transmitter means that these intermodulation distortion products will not exist to be amplified by your linear.
High-Power 400-Watt Final Amplifier Stage
The final amplifier stage of the FT
DX
9000MP utilizes a parallel pair of ST Micro Electronics Corp. SD2931
MOSFET devices operating at 50 Volts. This parallel push-pull configuration provides low distortion along with
high power output. The 120 mm thermostatically-controlled cooling fan directs forced air across the heat sink,
should the heat sink temperature exceed the temperature that will trigger the thermostat.
L
OW
- D
ISTORTION
CLASS-A O
PERATION
C
LASS
-AB
AND
C
LASS
-A O
PERATING
P
RINCIPLE
Input
Class-A Class-AB
Continuous adjustment of the
Bias Level between Class-A
and Class-AB is possible.