AMERITRON ATP-100 Manuals

ATP-100 Instruction Manual Tuning Pulser 1 Ameritron ATP-100 Tuning Pulser The Ameritron ATP-100 Tuning Pulser relieves temperature related stress on amplifiers, tuners, and dummy loads while allowing proper system adjustments. It allows amplifiers to be properly adjusted without the use of long steady carriers. The Ameritron ATP-100 Tuning Pulser allows tuning of an amplifier with full required drive from the transceiver without over-heating the finals or anything else in the RF line. It sends a series of pulses to the transceiver allowing the peak power to be high enough to drive the amplifier to full power, but with the average power being low enough not to over-heat the final(s). The Ameritron ATP-100 Tuning Pulser works with any solid state amateur transceiver or transmitter, and all other equipment using positive keying line voltages below 50 volts open circuit and 100 mA closed key current. It can also be used with negative voltage key lines (commonly found in older tube type radios) provided keying voltages are below 25 volts dc open circuit. The Ameritron ATP-100 Tuning Pulser can also be used as a valuable troubleshooting and diagnostic aid. The Ameritron ATP-100 Tuning Pulser can be used in performance tests of QSK systems, wattmeters, and other equipment (see appendix). The Ameritron ATP-100 Tuning Pulser uses a single 9-volt battery for power, with battery life dependent on operating and storage time. To install the battery remove the cover by removing the two screws (one on each side) that secure it. A battery clip and holder, located on the left side of the enclosure, are provided for installing the 9-volt battery. Technical Description The Ameritron ATP-100 Tuning Pulser uses a 555 timer driving an FET open drain switch. Two internal controls allow independent adjustment of both pulse repetition rate (PULSE RATE) and on-to-off time duty cycle (DUTY CYCLE). PULSE RATE is adjustable from about 17 to 40 pulses per second, while DUTY CYCLE is adjustable from about 10 to 90 percent. The keying time intervals are typically adjustable from 2- 40 mS "on" time, and a 24 to 60 mS pulse repetition time interval. Minimum duty cycle and the slowest PULSE RATE occur at the full counterclockwise settings of both internal controls. The controls are designed to accept a small flat blade screwdriver.