Phantom Voltage For Condenser Microphones - Yaesu FTDX-9000D Operation Manual

P
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 trans-
ceiver (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 status
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.
Note
H When opening/closing the case, take care with your
screwdriver not to short out internal components, or
touch them in a way that will cause them to short
out against other components.
H Avoid touching internal components with your hand,
as static electricity can cause damage to certain com-
ponents if appropriate anti-static bench techniques
are employed.
H Only engage the phantom power when you have no
alternative but to use a condenser microphone re-
quiring such voltage. The wide availability of stu-
dio-grade Dynamic microphones (that do not require
the phantom voltage) generally makes the use of the
phantom voltage unnecessary over the life of the
transceiver. Because damage can occur if the phan-
tom voltage is enabled on a microphone not requir-
ing it, we strongly recommend that the jumper plug
at J28 (AF Unit) be left in its original position across
pins 2 and 3.
H The phantom voltage capability of the FT
is disabled at the factory, and the lack of this voltage
is not a "defect" or other condition covered by the
Limited Warranty on this product. Accordingly, if
you do not feel capable of enabling the phantom
voltage and ask a service shop to do so on your be-
half, a service fee may apply.
FT 9000D O
SSB/AM M
V C
9000D
M
T
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Figure 1
Figure 2
Terminology
Phantom Voltage
Phantom Voltage is a term describing the voltage (48 Volts
at 10 mA max.) provided via the front panel's XLR ("Can-
non") 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 internal jumper plug be moved.
Jumper Plug
(I nside the Transceiver )
48-volt Supply Line
Move
Disable Enable
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