AMERITRON ATP-100 Руководство по эксплуатации - Страница 2

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Усилитель AMERITRON ATP-100. AMERITRON ATP-100 8 страниц. Tuning pulser

ATP-100 Instruction Manual

Tuning Pulser

The CARRIER TUNE button is a momentary contact switch that temporarily

locks the transmitter in a continuous carrier transmit mode.

The PULSE TUNE button is a latching switch that activates the pulse circuit

when pressed in and locked.

Speech Duty Cycle

The duty cycle of average power to peak envelope power varies widely in the

real world. Every voice and system varies, no universal duty cycle of peak to

average power applies to the many real-world combinations of voices and

equipment.

Unprocessed speech usually has an average power between one percent and ten

percent of peak envelope power. Sustained speech, such as a long "hello",

produces average power levels that typically range from 10 to 30% of PEP.

Heavy speech processing increases the average power, pushing the short term

average power of normal speech to 30% or more.

During normal voice operation, most equipment heat is generated by the

quiescent current required to make the transmitting system linear. Proper

amplifier or transmitter tuning require adjustments at maximum peak power,

generally with maximum available drive from the exciter. A continuous tone or

carrier is generally used during adjustment, and the amplifier is generally tuned

for maximum output.

The continuous single tone carrier, commonly used to adjust the PA or tuner,

will raise heat significantly. The Ameritron ATP-100 Tuning Pulser allows

proper tuning while driving the PA with a low duty cycle waveform. It is NOT

necessary to use a peak reading meter when adjusting an amplifier or tuner with

the Ameritron ATP-100 Tuning Pulser , although the lack of a true peak reading

meter will prevent you from knowing the amount of peak power produced.