emi filter

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

DX For Me - DX Cluster  ^updated - DXCluster which will allow mobile usage. Now able to manage filter per bands and mode, and to save configuration for specific DX or special event stations.

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

W6PW Training & FCC Licensing - Academic and research resource focused on Amateur and Commercial FCC Licensing exam preparation

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

AI8O Piedmont North Carolina - Piedmont NC ham radio and scanner information.

Ham Talk - Ham Radio Forums - The webs premier Ham Radio discussion forums

Gisela Dierking NF/HF-Technik Germany - Many interessting accessories, like unversal audiofilter, Mixer interface for sound card, highvoltage powersupply,accessories for 706, hamradio vacation, and more

Hi-Q Antennas - HF Ham Radio mobile operation antennas manufacturer, W6HIQ, HA5CMG, VE7BOC, HF mobile antennas, screwdriver antenna, coils and filters.

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

E. H. Armstrong - Radio's premier inventor, Edwin H. Armstrong was responsible for the Regenerative Circuit (1912), the Superheterodyne Circuit (1918), the Superregenerative Circuit (1922) and the complete FM System (1933)

Amateur Radio Astronomy - A radio-telescope project observing the natural radio emissions of neutral hydrogen atoms throughout space.

How repeaters work - How repeaters work,with graphics and text.

WeatherExperts - WeatherExperts.Com, the premier online store for weather stations, instruments, anemometers, barometers, accesories, and satellite pictures. Excellent prices!

Premiere Electronics - We sell and service most CB and Export radios. All new radios come peaked, tuned and converted for free!

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

EchoFilter - EchoFilter uses the soundcard of a PC to process income audio signals in real-time. The narrow filter bandwidth allow the extraction signals and sounds from the audio signal that may normally be close to inaudible. It is intended for radio HAMS, hobbyists, researchers, scientists and students in the DSP field.

SpotCollector  ^updated - A free application that captures DX and WWV spots from up to 5 internet clusters and a local packet cluster. DX Spots are merged and stored in a Spot Database on your PC, enabling you to monitor, sort, and filter them in real time; known LotW participants are highlighted, as are needed stations. WWV spots are plotted to show SFI, A, and K over the last solar revolution.

Cluster monitor - Cluster monitor is a tool for web and telnet clusters monitoring. The program shows spot history, the latest spots are shown in a separate window with full information about the DX, announcements, WWV propagation, and full sorting and filtering capability. Full support for AALog and AAVoice by RZ4AG, DXAtlas by VE3NEA. Integrated dial-up support.

SSTV Pal Multimode - SstvPal Multimode, predecessor of EasyPal not supported anymore by Erik Sundstrup

MacDSP - Digital filter for Macintosh computers with a PowerPC processor

DXCluster for iPhone - DXCluster let you know in real time who is on the frequencies and where it was listened the last time. It let you create filters to only see which frequency/CQ Zone/ITU Zone and/or Country and after that you can have an alarm corresponding to a specific Zone or a specific country that raise a popup

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.