lf preamp

VLF-LF And the Loop Aerial - The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise. A Loop Aerial is described suitable for use on the LF and VLF bands together with a circuit of an interface loop tuner and preamplifier. The discussion extends to the problems of amplifier noise and the advantages of tuning the loop.

Universal LF/MF Preamplifier - "A ""Universal Antenna Preamplifier"" design, in Web page form. Works with long wires, loops, or whips. For longwave and medium wave."

Low Power LF Amplifier - ON6MU Low Power amplifier

Kenwood MC-50 modification - MC-50 microphone modification for high emphasis

LF/MF Preamplifier - A universal LF/MF preamplifier by Lyle Koehler, K0LR

144 MHz Antenna Pre-Ampilfier - Electronic circuit and components layout fot this VHF Preamp

137 kHz antenna preamplifier - A simple 137 kHz antenna preamplifier to make your FT-817 (and others) useable on 2200m band.