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4m Projects - Amplifiers

Click to enlarge300 W PA using 3 x RD100HHF1 by OZ2M
This PA has been designed by Sergey EX8MLE and uses three Mitsubishi RD100HHF1 FETs.
http://www.70mhz.org/index.php?categoryid=6&p2_articleid=437

Click to enlarge300 W PA using a MRF300AN transistor by EX8MLE
The power amplifier is designed to be used in amateur radio stations of 70 MHz band. The circuit is typical and does not require any explanations.
http://www.70mhz.org/index.php?categoryid=6&p2_articleid=433

Click to enlarge70 MHz 25 W Power Amplifier by OZ2M
This purpose of this page is to give a brief description of a 70 MHz power module PA that has been published in the Danish amateur radio magazine "OZ." This way hams outside Denmark may also benefit from the design.
http://www.rudius.net/oz2m/70mhz/pmpa.htm

Click to enlargeA 75 watt power amplifier for 70MHz by GIØGDP
This amplifier is intended to be simple in design, easy to build and as cheap as possible.
http://www.70mhz.org/gi0gdp_PA.htm

PA70H –50 watt rf amplifierfor70MHz by SP2DMB
This dokumentation concerns the construction of a power amplifier for the 4m band. The main part of the device is mosfet Mitsubishi RD70HVF1. Although it is dedicated to the higher band, but it is stable at 70MHz.
http://www.70mhz.org/sp2dmb_pa70h_eng.pdf

Click to enlargePre-amplifier for 70 MHz by G3PTU
This unit uses a dual gate MOSFET. You can use virtually any of this variety of semiconductor; the ‘Philips’ radial type e.g. BF981 appears to be just as good as the top hat types.
http://www.70mhz.org/index.php?categoryid=6&p2_articleid=267


Creation date : 10/11/2011 @ 23:42
Last update : 29/03/2020 @ 17:20
Category : 4m Projects
Page read 15382 times


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