MFJ MFJ-1262, MFJ-1262M User Manual

MFJ-126211262M Instruction Manual Microphone Control Center

INTRODUCTION

Thank you for purchasing the new MFJ-1262. Your new microphone control center allows you to switch
between two microphones with the push of a button. From a boom mic/headphone to a desk or hand mic,
a hi-fi ragchewing mic to a hard-hitting DX mic, or a hand mic to a desk mic, switching microphones is
now quick and easy. Moveable jumpers allow you to make any 8-pin micr opho ne co mpati ble for use
with any radio. Plug in an exter nal PTT foot switch to free your hands for contesting and DXing.
Alternatively, let a computer or voice keyer control the PTT line for automated operation. Plug in
headphones and set the volume to privately monitor
transmissions. Or, push in the speaker ON/OFF switch to broadcast your transmissions over your
radio's speakers.

COMPONENTS

FRONT PANEL:

Accepts a standard 8-pin microphone plug; an 8-pin modular for the
MFJ-1262M

Accepts a standard 8-pin microphone plug; an 8-pin modular for the

MICROPHONE A

MICROPHONE B

MFJ-1262M
Selects microphone A or B. Out selects Mic A and in selects Mic

B

MIC SELECTOR
SWITCH

HEADPHONES
SPEAKER
VOLUME

REAR PANEL:

PTT
SPEAKER IN

SPEAKER OUT

OUTPUT CABLE

Accepts standard '/+ inch stereo jack. Allows the user to insert
headphones to monitor transmissions

Turns output speakers on and off
Sets the volume to the headphones

Push-to-Talk. Accepts standard '/, inch mono plug

3.5mm stereo jack that runs from the output of the radio to the
input of the MFJ-1262 or MFJ-1262M

3.5mm mono ja ck c onnects to station lo uds pe ake r o r ot her au dio
accessories normally connected to radio speaker jack

Standard 8-pin microphone plug connecting the unit to the radio
microphone input; an 8-pin modular (RJ-45) plug is used for the
MFJ-1262M

MFJ-126211262M Instruction Manual Micr opho ne Control Cent er

MICROPHONE AND RADIO CONNECTIONS

Different manufacturers and different radios may wire the same style connectors differently. The MFJ­1262 and 1262M have internal headers that use small moveable jumpers. The MFJ-1262 uses
common round 8-pin microphone connectors found on most transceivers. The MFJ-1262M comes with
an 8-pin modular microphone jac k (like telephon es m i ght use ).
Internal jumpers are used to program connections for any radio that connects to the prewired connectors.
This feature eliminates the need for soldering jacks or purchasing adapter cables. The MFJ-

1262/1262M must be configured using the internal jumpers before use.

The microphone/radio setup procedure requires a few minutes of time. Before you start, you will need the
manual of your radio and microphone readily available.

IMPORTANT INFORMATION CONCERNING THE MFJ-1262M

Note:

The MFJ-1262 and MFJ-1262M jumpers only allow for the programming of one

microphone pin-out to one radio pin-in. To use another microphone, it must have the

same 8-pin output configuration as the microphone currently programmed for use.

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MFJ-126211262M Instruction Manual Microphone Control Center

PROGRAMMING INTERNAL JUMPERS

The MFJ-1262 comes pre jumpered. If your microphone and radio have the same 8-pin configuration
then no jumper changes are needed. However, if your microphone and radio do not have the same 8­pin configuration, you must program the internal jumpers to make them compatible. The pre jumpered
configuration for microphones A and B is input pins 1 through 8 are jumpered to output pins 1
through 8, respectively (input pin 1 to output pin 1, input pin 2 to output pin 2, etc.). The pre
jumpered configuration for the PTT is input pin I to PTT ground (sleeve) and input pin 2 to PTT hot
(tip).

Note:

For the MFJ-1262M, be sure to read the graphic titled "Important Information

Concerning the MFJ-1262M" on the previous page. The 8-pin configuration of

your unit could be referenced differently from that of your microphone or radio.
To program the i nter nal jumpers, be gin by removing th e s crew s from t he sides of the c abi n et . L ift the
cover off, and look from the front view. Notice the group of pins and black jumpers on the left side
between the microphone input jack and microphone output wire. The input pins start at the back and
are labeled I through 8 before repeating at the next output pin group. These pins program the eight
pins of the microphones.
Now locate headers five and six that run perpendicular to headers one through four. Notice that the
input pins go from left to right and are labeled 1 through 8. These pins program the PTT of the unit.
The Jumper Graphic on the n ext page show s each pin 's designation . Notice that the outpu t pins are
located on the outside rows of each header, and the input pins are located on the inside rows of eac h
header. Also, notice the pre jumpered configuration for the microphones and the PTT. Use the
graphic to reference the correct pins when programming the jumpers.

HEADERS

HD1: Combines output pins 1 and 2 and their corresponding eight-pin inputs
HD2: Combines output pins 3 and 4 and their corresponding eight-pin inputs
D3: Combines output pins 5 and 6 and their corresponding eight-pin inputs

H

HD4: Combines output pins 7 and 8 and their corresponding eight-pin inputs

HD5: Combines PTT ground (sleeve) with the 8-pin microphone inputs HD6:
Combines PTT hot (tip) with the 8-pin microphone inputs

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