dual band collinear

Understanding the Hexbeam - G3TXQ pages focuses on understanding the HexBeam antennas. Basics, dimensions, multi band issues, antenna modeling.

Inexpensive GPS mobile Antenna - An inexpensive external GPS antenna, for 1.5 GHz band for GPS receiver, If you operate APRS or just need an external antenna for your GPS receiver, here’s one that is easy to build yet offers surprisingly good performance in a compact size. Best of all, it uses commonly available components and materials.

A half slooper for 160 meters - Italian article includes picturer and plans to homebrew an half-slooper antenna for 160 meters band

10M Vertical Antenna - A vertical antenna plan for 10 meters band made with copper pipe and PVC pipe

UN DX Contest 2010 - The Kazakhstan Federation of Radio sport and Radio amateur (KFRR) and Ministry of Tourism and Sport of the Republic of Kazakhstan are announcing the First UN DX CONTEST All world-wide radio amateurs having the amateur radio licence are invited to participation. Contest period: 12.00 UTC 22 May – 12.00 UTC 23 May 2010 Bands: 160m, 80m, 40m, 20m, 15m, 10m. Modes: CW and SSB

9H1SIX Malta - 9h1SIX Beacon operating six meters band

144 MHz Beaconlist - List of beacons operating on 2 meters band

ARRL: US frequencies allocation - Transmitter power limits and frequencies allocation by band

IARU Region 1 Bandplan - IARU REGION 1 band plan

CB Packet Radio Internet Gateway DNX274 - Internet packet radio gateway DNX274 for european citizen band with BBS, Convers-chat and many more, located in Germany

DXRING - Site for live internet DX and CB/Freeband chat, DX propagation tools, DSP software, Live DX chat and CB chat pages using Java client, radio review

Fractus Antennas - Fractal Antennas are a new generation of multiband antennas for wireless communications. Based on a new design concept, fractal technology.

PC-Controlled 2m Receiver - This VHF receiver(118-173MHz) is fully controlled by PC(LPT port).Receiver presents a complete dual conversion.

The Four Metres Web Site - A website dedicated to 70 MHz Band

ATNF - Australia Telescope National Facility - Operates the Australia Telescope, a set of radio telescopes in New South Wales. These telescopes are used, individually or together, to study objects in the Universe ranging from the remains of dead stars to entire galaxies.

VHF UHF Operating index - RAC - VHF UHF SHF Bandplans, repeaters, satellites and many related info by RAC

KB2VGH's VHF pages - Bandplans, Beacons and many useful info on VHF operations

Dave's Web Shop - C & Ku band satellite equipment - LNBs & LNBFs - MPEG-2 dvb receivers - dishes & More.

AirNav Selcal Decoder - AirNav Selcal Decoder enables you to decode in realtime Aviation HF Selcal transmissions. It only needs an HF airband receiver and your Sound Card. No special hardware needed. With AirNav Selcal Decoder you do not need any other hardware decoding system. Just your PC and the Sound Card.

PropView - PropView is a free application that uses the included VOACAP, ICEPAC, and IONCAP engines to graphically display band openings between two locations over a specified 24 hour period. It can also build schedules for the IARU/HF beacon network and automatically QSY your transceiver to monitor each scheduled beacon.

WINRLC - Simple freeware tool to calculate several kinds of HF filters. Use to calculate L-C and R-C band filters and bandpasses, L-C, L-R and R-C highpasses and lowpasses, coils and capacitors.

SlowFeld - Win95 xperimental narrow band communication program that makes use of the Hellschreiber principle

DXKeeper - DXKeeper is a free application that logs QSOs, tracks award status, generates QSL cards & labels, addresses envelopes, uploads QSOs to eQSL.cc and LotW, and downloads progress info from eQSL.cc and LotW. It can reference the RAC, Hamcall, and QRZ callbooks as well as the QRZ.com web site to fill in data when logging, or to update already-logged QSOs. DXKeeper automatically interoperates with all members of the freeware DXLab Suite, including Commander (transceiver control and bandspread for Alinco, Elecraft, FlexRadio, Icom, Kachina, Kenwood, TenTec, Yaesu), DXView (world map, rotator control), WinWarbler (PSK, RTTY, CW, Phone) and SpotCollector (DX and WWV spots). It also interoperates with MMTTY, MMVARI, MMSSTV, MultiPSK, MixW, DX Atlas, and Ham Radio Deluxe.

How modify a CB linear to use in HF band  ^pop - how to modify a Cb linear amplifier to use in HAm HF band

How to obtain a dual voltage without a transformer - How to obtain a dual voltage without a transformer