coax ground

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

Vertical antenna for 160 meter - This high antenna require a large ground composed by 40 radials. It's not very handy expecially in windy situations but is very powerfull in pile-ups. In italian

2-Element-Yagis for HF  ^{updated  pop} - 2-Element parasitic Yagis for the Shortwave-Bands 10-12-15-17-20-30m. The antennas are feeded with the DK7ZB-match. A quarter-wave choke of coax is grounded at the socket.

The 2-Element-HB9CV-Beam  ^updated - The HB9CV-Beam is a 2-Element-Yagi with two driven elements and was introduced by Rudolf Baumgartner, HB9CV in the 1950ies. The Beam is a coax-feeded version of the ZL-Special Construction by DK7ZB for 2m, 6m and 10m

6 Meter 5/8 Wave Vertical Antenna - The G3JVL 6 Meter ground plane vertical is a compact antenna that is ideal for portable operations. If needed, it can be disassembled into a very small bundle no longer than the longest element.

High impedance baluns - Introduction with some background on balun types

A 1:1 Coaxial Balun  ^pop - PDF article on a coaxial 1:1 balun by I0QM

Coax Cable Loss - Table representing loss of Coax Cables in db per 100ft.

Transmission Lines - About feed lines, parallel lines and coaxial lines, notes on impedance, SWR, Baluns, velocity factor and more by NZART

Eliminating TX RF Feedback Problems - Malfunction of transceivers due to stray RF pickup is a common problem, especially when using end-fed antennas, high-impedance feedlines, or a poor ground counterpoise

G5RV vs. Ground Plane on 80M - Comparison tests by WF7T of a G5RV antenna vs a GP antenna on 80 meters band

Ground / Radial Systems - Guide to ground mounting antennas by Bencher

Radial systems and ground - Radial systems for elevated and ground mounted vertical antennas by SteppIR

Copper Cactus Single Coax Feed - Single Coax Feed to Multi-Band Copper Cactus Antenna.

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

The FD4 (FD3) Windom Antenna  ^pop - The 4-band Fritzel model FD4 is a special version of a Windom antenna. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end

WM2U's PSK31 Page - An interesting article on PSK31, includes informations on interfacing to sound cards, troubleshouting, list of psk31 softwares and some historic backgrounds.

Today's Space Weather - SEC - Another interesting reports page with plots and graphs of solar flux. Interesting resources provided here includes, Solar images, a text 3 day solar geophysical forecast, a 3-days Solar X-Ray flux plot updated evety 5 minutes, The Satellite Environment Plot, combines satellite and ground-based data

WASP-NET - Complex CAD and Optimization Software for Waveguide, Coax, Combline and Antenna components design and antenna modelling

Coax Cable loss and SWR calculator - This small window application will calculate Coax Cable loss from SWR and SWR from Cable Loss

Tower - Windows program for analyzing vertical antennas. This program shows the resistance and reactance to be expected looking into a cylindrical metallic tower over a perfect ground. It gives a useful approximation of the values to be expected in a real-world situation.

WinTick - WinTick is a utility program aiming at synchronizing the PC clock to Universal Coordinated Time (UTC). It was originally developed for accurate satellite tracking, running on the taskbar while a NASA-compliant tracking program (SGP4 or SDP4) is running in the foreground.

Coax Switch 160-10 meter - Cheap and Dirty Coax Switch by Glen E. Zook, K9STH

Idiot's guide to coaxial cable  ^pop - A very beginner's guide to coax cables. Characteristics, detailed comparison of typical coaxial cables, commonly used connectors, and a few words about SWR.

Coaxial Stub Filters - Coaxial stub filters used at W7GJ