make trap cover

Petlowany Three-Band Burner Antenna - The Petlowany Three-Band Burner is a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters). This web page contains pictures, performance data, and enough construction details so you can homebrew your own.

The Cobwebb HF Antenna - The G3TPW Cobwebb antenna covers five bands, 14 - 28 mhz, including the WARC bands

Wire antenna with coaxial cable traps - This multiband antenna 10-80 meters is a home made project by I1BAY. Has been used for SOTA activations with great results. Traps are done with coax cable turns, dimensions are in the attached schema.

T2FD, The Forgotten Antenna - The terminated. tilted, folded dipole T2FD is a little known antenna that performs excellently. Compact in size compared to a half­-wave dipole the T2FD provides signal gain, wide frequency coverage, and exceptionally low noise characteristics.

Make your FM Dipole antenna - There is a simple, homemade antenna that can pull-in your favorite station.

How to make a Simple Dipole Antenna - It is very easy to create a simple 1/2 wave dipole, all you need is some lengths of wire such as the core of some mains flex or even a straightened out metal coat hanger, some co-ax cable and a connector for your scanners antenna input

The Crossed-Field Antenna - Please be aware this article introduces a completely new concept in antenna theory. In fact, this is considered the most important development relative to antennas in this century. It is so pervasive that a series of articles are required to cover the concept and its applications to the depth and extent it deserves. This is the first publication about the Crossed-Field Antenna

Making a half wave coax cable - How to make a half l or quarter l coax cable for a specific frequency

Dave's Loop Antennas - N2DS home made loop page

Multi Band Antenna Traps - These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance.

Trapped antennas - ARRL index of document about trapped antennas and notes on traps usage

TrapDip - This program let you design and performance of 2-band trapped dipole antennas including trap design.

CoaxTrap - This program let you design of antenna trap using length of coaxial line wound as solenoid on a coil former.

VE6YP CoaxTrap - The Coax trap program computes design parameters for the construction of coaxial traps for HF usage. Typically these are constructed from PVC tube and RG58/59 coax

Z Match for High RF power - Based on VK5BR's Z-Match and designed for High RF Power covers 160 to 10 meters by VK6YSF

7 Mhz traps for W3DZZ

AF6P - FILAMARS of San Diego - Web page of the filipino american amateur radio society of san diego af6p. it's repeater in 2 meters and 220 mhz cover a wide range and can be accessed anywhere in san diego area.

MT. Tom Amateur Repeater - A Massachusetts Non-Profit 501-C(3) corporation of amateur radio operators chartered in 1978 covering the Connecticut River Valley in Western Massachusetts and Northern Connecticut.

Comprod Communications - Maker of robust and strong commercial and amateur radio VHF UHF antennas

Madell Technology Corporation - Makers of oscilloscopes, spectrum analyzers, frequency counters, power supplies and more testi equipment products

K6MVR MVRC Radio Club - The Mt.Vaca Radio Club (Call sign K6MVR ) owns and operates repeater systems in and around Sacramento, California. The systems provide reliable coverage for mobile stations throughout the Sacramento Valley region and beyond to Modesto, Chico, the Sierras, and parts of the Bay Area.

Repeaters database on Google Maps - Interesting google map and repeater database integration that let you search, display and also edit repeaters and relative coverage using google maps api by K5EHX

TLDetails - Transmission Line Details. This utility program shows the impedance and SWR at both ends of a transmission line and the details of power loss in the line. It includes characteristics for over 40 built-in line types. You can modify these values to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes. If you are using a moderately fast computer you can hold down a spinner and "watch the movie" on the charts as the results are recomputed. By AC6LA

AVR Beacon Keyer Project - Description of an HF beacon keyer with telemetry. What makes the keyer rather different is its versatility - it is a multi-mode unit, with ASK and FSK modulation, sending Feld-Hell and Morse on command.

How to make a Q meter - This article appeared in the February issue of Amateur Radio and is reprinted here for the convenience of others