band pass filter

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

I5TGC Antennas - Reduced size longwave antennas by Cesare Tagliabue I5TGC and his experience on 136 kHz band.

KQ6XA Antennas and towers  ^pop - Interesting antennas pojects such as Broadband/Multiband Dipole and Tower radiating antennas for 80m and 160m, HF antenna for the micro-light backpacking enthusiast

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

9H1SIX Malta - 9h1SIX Beacon operating six meters band

DXCluster IOTA spots - Live IOTA spots by the dxsummit dx cluster

Region 1 Bandplan - Bandplans for region 1 in pdf format by DARC

PE1PKU Peter - technics, radio astronomy, great links, duplex filter

SV5BYR Mike - Six meters (6m) operation and satellites and two meters band

La bande magique, le 6 mĚtres... - Page consacr? Ë la bande magique qui est le 6 mĚtres plusieurs info vous attends... in French

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.

Palstar - Receivers, Antenna Tuners and accessories, antenna analyzers, dummy loads, wattmeters, shortwave radio receivers, baluns, filters

Radio Direction Finding SM5SVM - SM5SVM ARDF resources

UK Repeater Management Committee - Committee of the Radio Society of Great Britain responsible for the management of repeaters on the various frequency bands on which repeaters are permitted to operate.

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.

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.

DSPFilter - MM Hamsoft  ^pop - Freeware DSP filter by JE3HHT

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

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

7 MHz SSB Transceiver  ^pop - Circuit diagram and discription of 7 MHz Ham Radio SSB Transceiver. Transceiver using two MC1496, 4.43 MHz Ladder filter, LM386, LM324 and IRF840 in final.

Ham Radio Circuits  ^pop - Circuits of SSB Transceiver, AM DSB Transmitter, Antennas, BFO, VFO, 807, FM Mike, Crystal filter and more.