The original diagram was taken from the data sheet of Mitsubishi 2SC1946A designed to operate at 175MHz. Both input and output tuning network was modified to work between 88 to 108MHz very well intended for our main purpose. Large heat sink is required since the 2SC1946A must operate at 100% duty cycle. Forced air cooling aids in dissipating the heat produced by the rf transistor. The use of high voltage trimmer capacitor is a must and the use of ground plane technique is best suited for this project. RF input of 1 to 2 watts coming out from the exciter is enough to drive this amplifier to produce 20 to 25 watts of rf output assuming that the DC supply is at 12 volts. Take note that this rf amplifier is operated in class C therefore, the need for low pass filter in the output must be installed to avoid interference caused by the harmonics generated by this amplifier. --- 73 de hevir
hello mate is there a pcb lay out of this board? and a components list showing where there would be soldierd if so could you email me at scotthntr441@gmail.com cheers 73s
ReplyDeleteHello sir good morning. May PCB lay out kaba nito at ang nasa diagram ba na mga pesa ito ba yon lahat? Pwidi mo ba ako ma shareran nito gamitin ko lang kc ito sa aming church. Kung pwidi mo ako bigyan ng PCB lay out ito po ang email ko. judy_estella@yahoo.com. Maraming Salamat po
ReplyDelete