multi mode

NVI 40 Meter Antenna Modeling - The idea of using a low mount dipole, enhanced with reflector wires directly beneath the dipole, on the ground, appears to be a very good approach to creating an NVI specific antenna for local HF operation.

A Cost Effective Current-mode 1:1 Balun - A cost effective current-mode 1:1 balun can be constructed from a length of coax and a rod typically used for a broadcast antenna loop-stick, some electrical tape, cable ties, a length of PVC water-pipe and some connectors.

The Guanella 1:4 balun - A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods, some electrical tape, cable ties, a length of PVC water-pipe and some connectors. This form of 1:4 current-mode balun is named after G. Guanella.

The normal-mode helix antenna - A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda

A Portable Antenna for Satellites - A portable antenna for mode B and J satellites

Sensitivity of Multi Turn Receiving Loops - Magnetism is manifested as a 'field of vectors', that is, any point in the magnetic field has not only a magnitude, but a direction in space. The four Maxwell equations describe how electric and magnetic vector fields behave and interact.

Antenna Theory - Introduction to Electromagnetics, Maxwell's Equations, Transmission Line, Models, scale modeling, constants

Coax Traps from a Modeling Perspective - About Coax Traps, NC4FB examine the operation of coax traps through modeling.

Comparison of two windom antennas - The antenna comparison being reported was between a commercial Chelcom 136ft multi-band windom designed for 80m to 10m and a home brew 260ft full size windom designed for 160m to 10m by G0VVN, G3KAU and G3GRO

Windom for 80-40-20-10 m - A windom multiband antenna for 80 40 20 and 10 meters band. Include picture for a 1:6 Balun. In french

The Carolina windom antenna - Homebrewina a multiband windom antenna

Windom Antenna with 4:1 balun - The Windom is an Off-center wire multiband Antenna. The old version was fed just by a single-wire connected on 1/3 of antenna's overall length or with an open-line feeder (later versions). Here is another model with coaxial feeder, which is compatible with Solid States - 50 Ohm output transceivers .

ZX0F - CQ WW SSB 1999 - Pictures of the CQ WW SSSB 1999 Multi-Multi from Fernando de Noronha Isl.

Mono County CQP Expeditions - In 2004, 2005 & 2006, after many years of very successful multi operator county expeditions, Jim (W6KC) did single operator expeditions to Mono County.

Lincoln Amateur Radio Club - Everything you need to know about how to being a ham. Classes, testing, operating various modes and equipment

HB9FX Internet Remote Base JN37XH Hochwacht Zofingen Switzerland - Tune and / or listen between 10kHz - 10GHz to professional Online-Receivers as Rhode & Schwarz EK070 or AEG E1900/3, Amateur-Radio-Transceivers, Web-SDR, Digital-Modes, Repeaters, EchoLink, APRS or control Antenna-Switch-Matrix, Antenna-Tuner, SWR & PWR- Control or Web-Cams.

Haverford Squid Poles - Haverford stocks a large range of multi-purpose telescopic poles. They are high quality fibreglass construction with approximate wall thickness of 1.1mm

Dannex - Swedish manufacturer of broadband antennas designed for multi frequency, medium and long range communication. No tuner required.

Micro908 Kit - A re-usable control & computing platform for antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP

BandPlans.com - Have you ever wondered where different modes should be operated, what frequencies to avoid as a courtesy like SSTV etc? This site offer a database for known net frequencies,known segments for different modes, known beacons

Wadsworthsales - Manufacturer's representative of wireless communication radio equipment, 2-way radio sales, land mobile radio sales, repeaters, duplexers, antennas, pl tone, hf, vhf and uhf data modems and LAN ethernet radio modems for commercial and amateur radio users.

Yagi-logper - Yagi-logper is a linux GPL program to model a Yagi or Log-periodic antennas with horizontal cylindrical dipoles.

Ipox5 radio link system - Ipox5 is the freeware version of a commercial radio linking system, designed for amateur, nhw, emergency communications etc. It is optimised for mobile broadband and difficult IP links. It allows PC access, and up to 100 users on your link at one time. Usefull for multiple PMR446 use on very large sites. Works under Windows 98, XP, Vista, and Linux (under Wine)

ScopePar - ScopePar turns your old PC into a multi-channel oscilloscope, the user-interface to which is SeriCon on Windows PC.

Lightning Safety & Power Quality Issues - LightningProtection: Lightning Safety & Power Quality Issues. A moderated professional forum by recognized experts, for accurate technical information on lightning, surge and grounding information.