NON-MODULATION 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-MODULATION PLREVENTION CIRCUIT:
Remove the battery cover (13) and cut off the lead wire (12) 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.
13) Battery Cover : Remove the 2 set screws of bottom plate and set the batteries (4*UM3)
correctly. The batteries are not provided with this microphone. (Optional
Accessories: External Power SupplyAdaptor model PS-6A will enable you to
use with DC13.8V External Power Supply Unit.)
COMPRESSOR AMPLIFIER FUNCTION:
Compressor Amplifier serves constant distortionless
output level regardless of the audio input level conditions.
In other words, depending on the audio input level,
electrical volume control is automatically made. Please
refer to the sketch below. The input levels from ‘a’to ‘b’
are linearly amplified and from ‘b’to ‘d’are compressed.
The compressor level means the voltage ratio of input
levels at ‘b’ and ‘d’. For example, at compressor “HIGH”, compressor area 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 “AVAIR” conversion cables optionally available. Please refer to the table of
Microphone Cables.
* Even when you use the “D” type microphone cables, you cannot supply the power from transceiver.
Please use the batteries.
* Please be careful about high SWR of antenna and incomplete earthed, since it may cause the trouble of
RF Feedback Noise depending on coaxial cable layout.
* Please be sure to turn the power switch “OFF” after QSO.
* It is recommendable to use the Alkaline batteries.
* Do not place the microphone near high temperature area or under direct sunlight.
AVAIR ELECTRONICS CO
