50 mhz maps

21 mhz half wave GP Antenna  ^updated - 21 mhz half wave ant -very low radiation angle - full size and light weight- all coax matching system - decoupling care to prevent low angle radiation degrade

The Sperrtopf antenna for 2 meter band - By ON4CFC Pascal, describe how to build a Sperrtopf or Sleeve antenna for the 144 Mhz, PDF File by antennex

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.

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

W4JOH Cobra Antenna - The original Cobra antenna, is a multiband 160 or 80 to 10 meter, designed by W4JOH is built using standard insulated wire of about 14 gauge and fed with 450 ohm ladder line down to the shack into a tuner.

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

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

S50E Danilo Brelih site - S50e, radio klub cerkno

IK1HGI Beacon - Beacon from qrss on 28.322,08 Mhz

HB9DHG QSL gallery - Fully seachable and ordered QSL cards gallery includes front and back of thousands of QSL cards received by HB9DHG

W9BPT Palisades ARC - This club originated in the mid 1950’s with a small break in the late 50’s early 60’s and a rebirth in the middle to late 60’s.

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

LEMO Connectors - Lemo offers over 50,000 circular connectors for a variety of industries including medical, military, and test and measurement.

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.

APRSa4 - APRS+SA does most of the functions of the original APRS(tm) with a big difference: The maps it uses to plot the locations are Street Atlas 4.0 or 5.0 Maps. This allows great precision in locating objects and stations.

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.

IK5MEN HF amplifier 10-160m. - Italian page including pictures schematics diagrams of an home made linear amplifier using four EL509 in parallel. Output power is about 700W.

G3YXM 500 W PA - 40-80-160 meter band linear amplifier

LA7MI 40W RF Amplifier for 80m - 40W Linear Power amplifier with FETs for 80m Some notes about saturation in ferrite- and iron-cores. Written by LA7MI Stein Torp, N-5005 Bergen

432 MHz Power amp - by RA3YCR

GJ4ICD's 8877 50MHz Amplifier - A Compact 8877 50MHz amplifier and Power supply

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