Fred Maia, W5YI (SK)

Ham Radio News

CQ columnist Fred Maia, W5YI, a leading amateur radio journalist, educator and pioneer of volunteer examining, passed away on March 28 after a battle with cancer. Maia, 76, published “The W5YI Report,” dubbed “America’s Oldest Ham Radio Newsletter,” from 1978 to 2003, and has been a CQ contributing editor since 1985. His regulatory affairs column,…

RF Source PM500EF MOS-FET HF Linear Amplifier

QRO/QRP

PM500EF it’s an RF Power Amplifier designed for Medium Wave Broadcast Radio Band transmitters. PM500EFs output power is 500 Watt PEP ( 125 Watt Carrier ) at 50 Ohm load. This PA amplifies the input RF signal typically by 17dB, it operates at 48V / 17 Amp. max power supply.The operating class is B Push-Pull…