Yaesu FTdx5000MP, Руководство по эксплуатации

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Page 78 FT
DX
5000 O
PERATING
M
ANUAL
E
NHANCING
T
RANSMIT
S
IGNAL
Q
UALITY
L
OW
- D
ISTORTION
CLASS-A O
PERATION
(
SSB M
ODE
)
Class-A operation of the FT
DX
5000 transmitter is provided, yielding ultra-low distortion products during SSB operation.
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 “ 169 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 “
” icon disappears,
confirming that the CLASS-A mode has been disen-
gaged.
CLASS-AB CLASS-A
Id: Drain Current
V
DS
: Drain Voltage
(VFO-B)[SELECT] Knob [MENU] Button
(VFO-A)[SELECT] Knob [CLASS-A] Button