Phantom Voltage For Condenser Microphones - Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual

P
HANTOM
For powering a studio-quality condenser microphone connected to the front panel's XLR ("Cannon") connector, it is
possible to enable a 48-volt DC line connected to that jack. Because the improper enabling of this voltage could cause
damage to other microphone types, the simple process for enabling the voltage has been made somewhat complicated, so
as to prevent the voltage from being enabled by accident.
1. Turn the front and rear panel power switches Off.
2. Unplug the AC cable from the rear panel [ AC IN ] jack.
3. Referring to Figure 1, remove the eight screws from
the sides of the transceiver case.
4. Now remove the six screws shown in Figure 1 from
the bottom case.
5. Referring to Figure 2, locate jack J28 on the AF Unit,
and remove the jumper plug which is connected across
pins 2 and 3 of J28.
6. Connect the just-removed jumper plug so that it now
is connected across pins 1 and 2 of J28 (instead of the
original position across pins 2 and 3).
7. Replace the six screws to affix the bottom case, and
replace the eight screws from the sides of the transceiver
(these screws were removed in steps 3 and 4 above).
8. Connect the AC cable to the rear panel's [ AC IN ] jack.
9. Turn the rear panel's power switch on, then turn the
front panel power switch on.
10. If the above process has been successfully completed,
you will observe that a small red LED just above and
to the right of the XLR connector is now illuminated.
If this LED is not glowing red, please check the sta-
tus of the jumper plug once more.
11. If the red LED is glowing properly, the modification
to enable the phantom 48 Volt line is now complete.
N N N N N
O O O O O TE
When opening/closing the case, take care with
your screwdriver not to short out internal com-
ponents, or touch them in a way that will cause
them to short out against other components.
Avoid touching internal components with your
hand, as static electricity can cause damage
to certain components if appropriate anti-
static bench techniques are employed.
Only engage the phantom power when you
have no alternative but to use a condenser
microphone requiring such voltage. The wide
availability of studio-grade Dynamic micro-
phones (that do not require the phantom volt-
age) generally makes the use of the phantom
voltage unnecessary over the life of the trans-
ceiver. Because damage can occur if the phan-
tom voltage is enabled on a microphone not
requiring it, we strongly recommend that the
jumper plug at J28 (AF Unit) be left in its
original position across pins 2 and 3.
The phantom voltage capability of the FT
9000D is disabled at the factory, and the lack
of this voltage is not a "defect" or other con-
dition covered by the Limited Warranty on this
product. Accordingly, if you do not feel ca-
pable of enabling the phantom voltage and
ask a service shop to do so on your behalf, a
service fee may apply.
FT 9000D O
DX PERATION
V
OLTAGE FOR
TE TE
TE TE
DX
M
ANUAL
SSB/AM M
C M
ONDENSER ICROPHONES
T T T T T
ERMINOLOGY ERMINOL ERMINOL ERMINOL ERMINOL
Phantom Voltage
Phantom Voltage is a term describing the voltage
(48 Volts at 10 mA max.) provided via the front
panel's XLR ("Cannon") microphone connector,
for use with a studio-grade condenser microphone.
Although disabled at the factory, enabling of the
voltage only requires that the position of an inter-
nal jumper plug be moved.
T
ODE RANSMISSION
Jumper Plug
(I nside the Transceiver )
Figure 1
48-volt Supply Line
Move
Disable Enable
Figure 2
OGY OGY OGY OGY
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