137 mhz yagi

The Optimized Wide Band Antenna - Yagis for 20 15 10 meters band by Nathan A. Miller

137 MHZ QHF Quadrafilar APT Antenna - This version of the 135mHz quadrafilar antenna for APT reception is an adaptation from Bill Sykes and Bob Cobey's article Taming the QFH which appeared in the March 1997 RIG magazine.

Portable yagi antennas - A 3 and 5 element portable yagi antennas for 2 meter band

Vertical half-wave aerials for 4m - Practical designs pictures and alternative design of antennas for 70 Mhz by Ross Wilkinson G0WJR

3 element 50 Mhz Yagi - A 3 elements long yagi antenna for 6 meters band by ON6MU

A Hairpin match for 5 el. Tonna - How to improve the gain of your 5 element Tonna yagi for 50 MHz by roughly 3 db! by PA2HJS

N3DNO's Antenna calculator - A 3 element yagi antenna calculator that uses javascript by N3DNO

KC0TKS Antenna Calculators - Allow calculation of a dipole, 3 element yagi and a vertical antenna

900 MHz antenna - VE3CVG's 900 MHz 7 Element Plumber’s Delight Yagi Antenna

Stacking Yagis - Stacking principles, with homebrew coax- and power-splitters by DK7ZB

4 element yagi for 20 meters - Pictures and plans of a 4 elements yagi beam antenna for 14 Mhz

5 element yagi for 20 Meter band - Picture and construction details of a 5 element 20 meter monobander

IK1HGI Beacon - Beacon from qrss on 28.322,08 Mhz

WAFAR - Western Area FM Amateur Repeater Club - The main WAFAR transmitter site is on the roof of the Civic Opera House in Downtown Chicago, and sends our 2-meter and 440 MHz. repeater signals all over Northeast Illinois.

RF Amplifiers - Solid State and TWT Amplifiers From 1 MHz to 40 GHz with Power Levels from .1 mil Watt to 2.5 Kw

DXBeam - Located in France, DXBeam designs and manufactures a range of monoband, dual band and triband antennas, rotary dipoles, Moxons and Yagis

UHF Reject filter - This filter is a 0.1 dB Tschebychev lowpass with a rejection of 90 dB or better at 430 MHz, and 0.2 dB insertion loss at 72 MHz.

HeliCoil - Inductance calculation for single layer, air-wounded coils and helixes up to about 800 MHz. Inductance calculations accuracy is around 1%. Also, coils with maximum Q for given inductance, resonant RF chokes, PI and T resistive attenuators calculations are provided. Skin effects, radiation losses and other minor side effects are not accounted in maksimum Q factor coils calculations. Program assumes using copper (Cu) enameled or silver (Ag) plated wire. Program is writen bilingual in English and Serbian by YU1AW

RF Filters - MS DOS Program for calculations of HP, LP and BP filters at VHF and UHF frequencies up to about 800 MHz by YU1AW

VHFCtest4Win - VHFCtest4Win is software for contest logging QSO's on VHF bands (50MHz and up). It is build for all windows versions from Windows 95 and up. by S52AA

ATPDEC - Atpdec is an open source program that decodes images transmitted by POES NOAA weather satellite series. These satellites transmit continuously, among other things, medium resolution images of the earth on 137Mhz. These transmissions could be easily received with an inexpensive antenna and dedicated receiver. For more information about receiving POES satellite images consult the rig site.

432 MHz Power amp - by RA3YCR

IK8MKK Home-Made equipment - Two 50 Mhz amplifiers and antenna switch

YU1AW 2m PA - GI-7B, GS-31B & GS-35B power amps, 144 MHz QRO

50 MHz GS35b Power Amplifier - OZ1DPR six meter power amplifier using the russian VHF triode GS35b