Low- Distortion Class-A Operation - Yaesu FTDX5000 Series Operating Manual

E
NHANCING
L
OW
Class-A operation of the FT
Power output during Class-A operation is 75 Watts.
1. To engage Class-A operation, press the [ CLASS-A ]
button. The " " icon will appear in the display,
confirming that Class-A operation has been selected.
2. Engaging the "Class-A" mode actually places the trans-
ceiver in a condition whereby the Bias level may be
adjusted, via the Menu mode.
1 ) Press the [ MENU ] button briefly, to engage the
Menu.
2 ) Rotate the ( VFO-A )[ SELECT ] knob, and select
Menu item "170 TGEN BIAS".
3 ) Rotate the ( VFO-B )[ SELECT ] knob to select the
desired BIAS level "1 - 100" to set the transceiver
for operation anywhere between Class-A and Class-
AB (Class-AB has lower heat dissipation but higher
distortion products).
A menu setting of "100" will place the transmitter
fully in Class-A operation. Counter-clockwise ro-
tation of the ( VFO-B )[ SELECT ] knob will move
the transmitter toward Class-AB operation. The
menu setting "1" will place the transmitter fully in
Class-AB operation.
4 ) Press and hold in the [ MENU ] button for two sec-
onds to save the new setting and exit to normal
operation.
3. To exit from the CLASS-A mode, press the [ CLASS-
A ] switch once more. The "
confirming that the CLASS-A mode has been disen-
gaged.
CLASS-AB
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T
RANSMIT
- D CLASS-A O
ISTORTION
5000 transmitter is provided, yielding ultra-low distortion products during SSB operation.
DX
" icon disappears,
Id: Drain Current
V
DS
S Q
IGNAL
PERATION ( SSB M
: Drain Voltage
FT
UALITY
)
ODE
[ CLASS-A ] Button ( VFO-A )[ SELECT ] Knob
[ MENU ] Button ( VFO-B )[ SELECT ] Knob
CLASS-A
5000 O
DX PERATING
M
ANUAL