D104-M6B / D104-M6C
TRANSISTORIZED COMMUNICATIONS MICROPHONE
The D104-M6 series microphones are quality performance field effect amplified "power" microphones for amateur, citizen band, mobile, aircraft and marine applications. The housing of the D104-M6B is molded black ABS with a chrome plated grille screen (pictured at right). The housing of the D104-M6C is molded black ABS, the front half chrome plated and the grille screen chrome plated.
An output impedance is compatible with the inputs of almost all commercial transceivers and an externally adjustable high gain amplifier ensures desired modulation level. The D104-M6 has an easily accessible volume control so that the correct modulation level can be set for each operators voice. The D104-M6 preamplifier is powered by a readily available, easily replaced, 9 volt battery. The D104-M6 has a six wire coil cord which allows for relay, electronic or virtually any type hookup with almost any transceiver. The audio line is open during receive.
Remove the rear housing by removing the four screws. Carefully lift off the rear housing. Unsnap the battery from the battery clips located on the small vertical pc board and install a new battery. Note that the wires from the coil cord should lay on top of the battery after it is installed. Carefully replace the rear housing ensuring the gain control knob passes through the hole in the housing and fasten with the four screws previously removed. Be careful not to overtighten the four screws.
At a speaking distance of approximately 2 inches (or the position you prefer) with the gain control in the rear housing turned fully counterclockwise, adjust the gain control for the correct modulation level. Turning the gain control clockwise increases the gain. Once properly set, the gain control should seldom require resetting under equivalent operating conditions.
If the microphone plug you have selected for your hookup requirements does not have a cable clamp suitable for our small diameter high quality microphone cable, use tubing as supplied by ASTATIC. Simply slip tubing over cable prior to soldering of lead wires. Position it to ensure proper clamping of cable and tubing by the connector.