Microphone Model 705

The Ten-Tec Model 705 is an Electret desk microphone designed for use as a station microphone in commercial and amateur radio communications and in public address and paging installations. The microphone consists of a base section and flexible gooseneck mounted microphone. The Model 705 incorporates a momentary type Push-To-Talk (PTT) button (gray), a Push-On, Push-Off locking type button (black), electronic circuitry to switch the microphone on, a signal amplifier that adds 13 dB of gain to the output level, an attached output cable and a battery compartment for a 9 volt alkaline battery. The PTT circuitry allows switching transmitters and/or transceivers, that have a low voltage positive T/R lines, into transmit mode. A light emitting diode in the base signals the transmit mode.

The Model 705 comes in two versions. The standard unit includes a four pin standard locking type cable connector which is pin compatible with Ten-Tec Models 560, 561, 562, 563, 564 and 585. With a minor resistor change in the Models 560 and 561, the standard unit may be powered from the transceiver without the need for a 9 volt battery. The Model 705-A comes with a stereo 1/4" phone plug. This unit is compatible with the Ten-Tec Models 525, 540, 544, 515, and other early models. A 9 volt battery is required for the Model 705-A.

• Type: Electret Condenser Microphone.
• Sensitivity: -52 dBV (0 dBV = 1 V/uBar @ 1 kHz).
• Output Impedance: Works with any circuit of 100 ohms or more.
• Maximum Sound Pressure Level: 130 dB
• Battery Type: 9 volt Alkaline transistor battery.
• Electronics: C-Mos PTT switch, C-Mos signal amplifier, NPN T/R transistor.
• Current Required: Receive mode: Less than 2 microamperes. Transmit mode: 2 milliamperes typical, with 9 volt battery.
• Semiconductors: 2 IC's; 1 Transistor; 7 Diodes.
• Weight: 12 oz. including battery.