This amplifier was built based on Marconi’s website, A Design for a 40W broadband VHF RF Power Amplifier for FM broadcast. A few minor tweaks were made to the schematic and a few parts were changed to what I had available (mostly surface mount components). The heatsink is from an old Motorola Mostar 800 MHz radio, and has the perfect heatsink island to match the MRF171A. Also used is a Progressive Concepts external LPF7002 low pass filter because it was also on hand. Since the MOSFET uses 28 VDC, I had to homebrew a 28 Volt / 5 Amp power supply using the schematic found in the ARRL handbook.
Tune up went exactly as stated in the how-to, with the RF power output hitting 57 Watts when driven with a stock Broadcast Warehouse 1 Watt LCD PLL transmitter at 98 MHz. Liberal use of ferrite beads and feedthru capacitors are on all RF detector, fan control and SWR control circuits.
Read More Source:http://www.geocities.com/Area51/Nebula/3736/40watt.html
Thank you.
Related Links
More circuit FM Antenna Amplifier
More circuit RF Amplifier
More circuit FM Transmitter
More circuit FM Receiver
More circuit RF Modulator
More circuit VHF Transmitter
Linear FM 30Watt with BLY89
RF Power Amplifier 1.3W to 6W by 2SC1970
FM Stereo Transmitter with IC BA1404
TV Transmitter with BC547
FM TRANSMITTER By 2N2222
FM Transmitter with Op-amp LM358
60W RF Linear amplifier
This entry was posted on Friday, October 19th, 2007 at 11:27 am and is filed under Power Amplifier, RF-Radio Frequency.
