MD-1 Installation Instructions
The following installation requires the removal of 1 resistor and the connection of 7 wires to the main circuit board of the
radio. See the chart for the resistor, AM modulator transistor, AM Power, and AMC controls for your particular radio
application.
Mount the MD-1 toward the rear of the radio near the Modulator Regulator transistor on a flat surface of the PC board
using the mounting tape supplied. Mount it on the topside of the board on surface mount radios and the bottom or solder
side of the through hole radios.
1.
Remove the resistor located near the AM Power control listed for your radio below.
2.
Connect the RED wire to 13.8 volts at the audio amp IC or after the On/Off switch.
3.
Connect the BLACK wire to ground.
4.
Connect the ORANGE wire to the hole of the resistor removed that connects to the power control trimmer
potentiometer. (On the Super Star 121 it will be the pad furthest from IC4}
5.
Connect the YELLOW wire to the other hole of the removed resistor.
6.
Connect the WHITE wire to the center pin of the AM Mod/Regulator.
7.
For a switch-able modulator, connect the GRAY wires to a SPST switch. In the closed position the modulator is off.
If a switch is not desired, leave the GRAY wires disconnected and insulate them with shrink tubing.
8.
For the higher power radios such as the RCI 2970DX, Galaxy 93T, and other radios a 15K resistor may be required
across the gray wires of the MD-1. These radios may require 10-Watts minimum dead carrier for the modulator to
work properly
9.
Set the power and modulation to your desired settings. Higher modulation creates more swing.
Radio
Remove Resistor
AM Mod/Regulator
AMC
AM Power
Clear Channel AR-3300, AR-3500
R224 5.6K
Q35 B754
VR17
VR16
Connex 3300, 3300HP
R238 5.6K
TR51 2SA1012/2SB754
VR14
VR13
Connex 4400, 4400HP, 4800
R264 5.6K
Q54 2SB754
VR16
VR14
Excalibur SSB
R238 5.6K
TR51 2SA1012
VR14
VR13
Galaxy DX11, 33, 44, 55, 66, 73, 77, 88, 99
R238 5.6K
TR51 2SA1012/2SB754
VR14
VR13
Galaxy DX22, 2527
R281 4.7K
TR51 2SB754
VR14
VR13
Galaxy 919, 929, 949, 959, 979 2517, 2547
R264 5.6K
TR54 2SB754
VR16
VR14
Galaxy DX45MP, DX48
R264 5.6K
TR54 2SB754
VR16
VR14
General Lee, Washington
R238 5.6K
TR54 2SB754
VR16
VR14
Magnum 257
R266 5.6K
Q78 2SB778
VR117
RV116
Magnum Maverick A24
R289 5.6K
TR52 2SB754
VR15
RV10
Magnum Delta Force
R412 5.6K
Q178 2SB754
VR117
RV116
Magnum Alpha Force
R385 5.6K
Q161 2SB754
VR109
RV115
Millennium 2002, 3003
R371 10K
Q161 2SB754/2SB778
VR109
RV116
President Grant DX
R279 5,6K
TR47 2SB754
VR14
VR13
RCI 6300HP, 6900HP
R264 5.6K
TR54 2SB754
VR16
VR14
RCI 2950
R281 4.7K
TR51 2SB754
VR14
VR13
RCI 2950DX, RCI 2985, RCI 6300F25, 6900F25
Q66 2SB754
VR17
VR15
RCI SS American Spirit, SS 158EDX
R264 5.6K
TR54 2SB754
VR16
VR13
Super Star 121
R238 5.6K
2SB754
VR4
H-VR13
L-VR16
Super Star 3900
R238 5.6K
TR51 2SA1012/2SB754
VR16
VR13
Texas Ranger TR-696FD1
R264 5.6K
TR54 2SB754
VR16
VR13
Virage VX-38, VX68
R264 5.6K
TR54 2SB754
VR16
VR13
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