desktop type compressor microphone (W/NON-MODULATION PREVENTION CIRCUIT)
SPECIFICATIONS

DESKTOP MICROPHONE MODEL
Thank you very much for your Purchase of  "ADONIS" Desktop Microphone Model AM−708E. To enjoy this unit satisfactorily, please   read the instructions carefully and we hope you can enjoy this microphone for a long time. FEATURES: o Selectable for 2 sets of transceivers at once by slide switch. o High Sensitivity Electret Condenser Microphone Element equipped. o High Quality Compressor Amplifier (High-Low selectable) built-in. It sends out always constant and optimum level without distortion regardless of audio input level. o Equipped with FM/SSB Audio Quality Selector Switch for optimum operation. o Non-Modulation Prevention Circuit built-in. After continuous transmitting for a few minutes, the alarm circuit will be activated with alarm sound for 30 seconds. Then, the condition returns to receiving mode automatically. o Battery-Check Circuit built-in. Turn the power switch on (by selecting "FM" or "SSB" position), and, the level meter indicates the battery condition with power  voltage for a few seconds. o Connectable with the microphone interconnecting cable provided with power feeding line. (Adonis terminal arrangement indicates it as   'B'  in the center of connector.) You can choose the power source from dry batteries (UM3 × 2) or transceiver (microphone connector DC5 − 9V/20mA minimum). CONTROLS( Front  Panel  and Rear Side): (Fig. 1) 1)  " Power" and "FM/SSB" (Battery Check) Audio Quality Selector Switch Set the Power Switch①  to "FM" or "SSB" position for the power "ON", and, the Level Meter⑧  indicates the battery condition. A little while later, the level meter will return to its original function of level meter. It gives optimum audio quality for both FM and SSB modes by changing the frequency characteristics, in particular, it is effective in DX operation. (HOW to check the battery) Turn the power switch①  "ON", then, the pointer deflects and stops for a few seconds. If the pointer stops at the outside of green-zone, replace the battery to new one.
ねM : M I C W P:PRESS TO TALK 40 G : PRESS TO TALK (EARTH)質U : UP @ D : DOWN B C : U D  COMMON @ G B : DC  F E D I NG (D I R E C T  CURRENT) (V I EWED FROM TERMINAL PIN SIDE) * When the transceiver connected to this model is supplying the microphone terminal  with DC5V−9V, 20mA minimum current, this model can  get  the DC power supply directly from transceiver by connecting with  "D" series  microphone interconnecting cables. For details, please refer  to  the list of the microphone interconnecting cables optionally available. 13) Output Adjustment Volume : Adjustment Volume for output voltage. It is factory-present at the optimum level. When the modulation level is not acceptable to you, please adjust this volume to have optimum level. M I C_OUT (Please adjust under theツHIGH" position of Compressor Level Selector Switch.) The Output is increased by rotating the volume(33 clockwise. Please adjust with 2mm wide screw driver carefully and slowly under monitoring by local station. (It is relatable 90° for both left and right from center position.) The Figure No. 3 shows the center position. 14) The Leadwire releasing  for the Non-Modulation Prevention Circuit. : When operating with battery, remove the 2 set screws of rear side(bottom 15) Battery Cover plate) and set the batteries (2 × UM3) correctly. The batteries are not provided with this microphone. (Optional Accessories : External Power Supply Adaptor model PS3 will enable you to use with DC13.8V external power supply unit. Please note.) NON−M:ODULATION PREVENTION CIRCUIT: When the transmitting condition continues for 2-3 minutes, the alarm circuits will be activated with sounding the alarm for 30 seconds. Then, the condition will return to the receiving condition automatically. (Timer Reset Function) When using the microphone with "LOCK"(continuous transmitting), press the "LOCK" switch again and the timer for alarm will be reset and the timer again starts for counting. When sounding the alarm, the alarm will stop by pressing "LOCK" switch. CANCELLING OF NON-MODLTLATION PREVENTION CIRCUIT: Remove the battery cover(۩) and cut off the leadwire (۩) yellow which is the wire for canceling the Non-Modulation Prevention Circuit. After cutting, please be sure to cover the wires (tip of wire) with insulation tape. COMPRESSOR AMPLIFIER FUNCTION: Compressor Amplifier serves constant distortionless 4) (F i g. level output level regardless of the audio input Compressor Area conditions. In other words, depending on the audio input level, electrical volume control is automatically made. L i n e a r l x Amp l i f i e d Please refer to the sketch below. The input levels from 'a' to 'b' are linearly amplified and from 'b' to 'c' Compressor Level are compressed. The compressor level means the voltage ratio of input levels at 'b' and 'c'. For b a c example, at compressor "HIGH", compressor area l n p u t L e v e l Includes from 1mV and it has 45dB compressor Level minimum. So, you can send out the constant output level regardless voice, whispering, small or loud. By the constant output level, you can extend the communication distance by using rated output power of transceiver without any loss. So, now it becomes common to use compressor amplifier between transceiver and microphone. CAUTIONS : ● Please be sure to use "ADONIS" Interconnecting Cables separately available. Please refer to the list of Microphone Cables. ● When supplying the power from transceiver with恐D″ type mic. cables, the batteries set to the microphone do not send the power to microphone, but, after switching the power of transceiver  ""OFF"", the batteries in the microphone will be activated automatically. Please be careful about it. Please be sure to turn the power switch "OFF" after QSO. When using external adaptor for power supply from DC13.8V, please be sure to use PS-3 optionally available. Please be careful about high SWR of antenna and incomplete earthing, since it may cause the trouble of RF Feedback noise depending on coaxial cable layout. Do not place the microphone near high temperature area or under direct sunlight. ● ● ●