YAESU MD-100
A8X
Desktop Dynamic Microphone
The
MD-100
A8X
features selectable low-cut filtering and high-emphasis active filtering that allow you to tailor the
microphone response for optimum voice clarity or DX punch. The
MD-100
A8X
is designed for base station operation
with the latest YAESU HF transceivers.
A multi-axis pivoting mount lets you adjust the horizontal and vertical position of the microphone to accommodate
various locations and heights, or you can remove the microphone from the base and use it independently (an auxiliary
toggling PTT button is provided, but the audio filtering and scan controls are not used).
The base of the
MD-100
A8X
includes a large push-to-talk switch and latching button, along with a large rotary up/
down slow/fast control for scanning. Jacks and cabling are provided to accommodate transceivers having either RJ-45
or round 8-pin
MIC
jacks.
WARNING!
Do not use with the FT-2400H/-7400H series, FT-2500, FT-8500 or others than those listed, as damage
may result from modular jack wiring incompatibility.
LOW CUT Switch
The OFF position provides flat-audio-char-
acteristic transmit audio.
Position 1 attenuates low audio tones, for
improved clarity in moderate band condi-
tions, or if you have a naturally deep voice.
Position 2 attenuates low audio tones more
than position 1, for improved clarity in
noisy band conditions.
To work contest pileups, the HIGH EM-
PHASIS filter provides even crisper audio.
Note: This switch is ignored when the
HIGH EMPHASIS switch is ON, and when
the MAIN switch is set to THRU.
Scanning Control
The operation of this control depends on
the transceiver. Some models do not sup-
port the FAST function.
The FAST button on the transceiver should
be set for momentary operation.
Rotate the control to the right to tune up-
wards, or left to tune downwards.
Turning it slightly activates slow tuning,
and turning it further activates fast tuning.
Center the control to stop.
If the squelch is closed, scanning will con-
tinue unit a signal is found or until you press
the PTT.
MAIN Filter Switch
Set this switch to the THRU position
to bypass the internal audio filters.
Set it to the FILT position to activate
the filters (according to the LOW CUT
or HIGH EMPHASIS switch set-
tings).
HIGH EMPHASIS Switch
Turn this switch on to amplify the
higher audio frequency components of
your voice, while also cutting the lows.
When this switch is on, the LOW CUT
switch selection is ignored.
This switch is ignored when the MAIN
switch (below) is set to THRU.
PTT Lock Switch
Press to lock the PTT on (for long
transmissions). Press it again to
release the PTT to receive.
Main PTT Switch
Press and hold this switch to talk,
and release to receive.
Transceiver Jacks
Connect the supplied cable to the MIC jack on
the transceiver, and connect the other end of the
cable to whichever of these jacks is appropriate
(do not use both of these jacks at the same time).
Auxiliary PTT Button
Use this button to key the transmitter when using the
microphone separate from the base. It functions as a
toggle: press it once to transmit, and again to receive
(you don’t need to hold it while transmitting).
Compatibility
The
MD-100
A8X
will work with past HF models that
include the round 8-pin jack (note- on some models, the
scan function may not operate).
When using the
MD-100
A8X
with the above transceiv-
ers, set the MAIN FILTER switch to the THRU posi-
tion. The LOW CUT and HIGH EMPHASIS filter
switches are disabled since no power is provided at the
microphone jacks on these units.
LOW CUT “1”
LOW CUT “2”
FILTER “OFF ”
FILTER “OFF ”
HIGH EMPHASIS “ON”
FREQUENCY (Hz)
Imp 500-ohm 0dB=-75dB
RESPONSE (dB)
Specifications
Transducer type:
Dynamic
Frequency response:
100 - 5000 Hz (-6dB)
Audio characteristic controls:
LOW CUT Switch
OFF position: standard frequency response
Position 1: -3 dB rolloff from 1000 to 150 Hz
Position 2: -3 dB rolloff from 1000 to 300 Hz
HIGH EMPHASIS Switch
ON: +6 dB at 3000 Hz
Sensitivity:
-75 ± 3 dB at 1 kHz and 500-ohm (0 dB=1
V/0.1 Pa)
Controls:
PTT switch, PTT Lock switch,Scanning con-
trol (only for specific transceivers)
Impedance:
500-ohm
Dimensions:
Base (WHD): 112 x 156 x 151 mm (w/o mic)
Microphone: 42.5 dia. x 189 mm
Weight: approximately:
670g (w/o cable)
YAESU MUSEN CO., LTD.
Tennozu Parkside Building
2-5-8 Higashi-Shinagawa, Shinagawa-ku, Tokyo 140-0002 Japan
YAESU USA
6125 Phyllis Drive, Cypress, CA 90630, U.S.A.
YAESU UK
Unit 12, Sun Valley Business Park, Winnall Close
Winchester, Hampshire, SO23 0LB, U.K.
YAESU HK
Unit 2002, 20/F, 9 Chong Yip Street,
Kwun Tong, Kowloon, Hong Kong
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