Amplifier Powers 20 W from 70 to 500 MHz

Amplifier Powers 20 W from 70 to 500 MHz

March 27, 2019
A broadband coaxial power amplifier is capable of 20 W output power from 70 to 500 MHz.

Mini-Circuits’ ZHL-20W-52-S is a coaxial high-power amplifier capable of 20 W output power from 70 to 500 MHz. As well-suited for amateur radios as for military communications systems, it maintains typical gain of 50 dB with gain flatness within ±0.7 dB across the full frequency range. Based on silicon LDMOS power transistors, the rugged 50-Ω Class A amplifier is unconditionally stable with any kind of signal modulation, using patented technology (U. S. patent 7,348,854) to maintain constant current consumption (4 A at 24 V dc), and incorporating multiple protection circuits, including overvoltage and over-temperature protection (which shuts off the unit when the baseplate temperature exceeds +100°C). It’s also reverse-polarity protected and will not suffer damage with an open- or short-circuit output load under full CW output power operation.

The amplifier has a typical noise figure of 7 dB and measures just 9.85 × 7.3 × 6.3 in. (250.19 × 185.42 × 160.02 mm) with SMA input and output connectors. It's  designed for an operating temperature range of 0 to +65°C when used with the company’s heatsink and fan.

Mini-Circuits, P. O. Box 350166, Brooklyn, NY11235-0003; (718) 934-4500.

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.

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