band pass filter

Vertical antenna for 40 and 80m - Homebrew a vertical antenna for 40 and 80 meters band based on popular HF2V model by DL7JV

G8VR a small Yagi for 50 MHz - Complete plans and drawings to build a Yagi for six meter band by Ken Willis, G8VR

The Copper cactus antenna  ^pop - Copper Cactus multiband J-Pole antenna

Homemade Carolina Windom antenna - Multiband wire antenna by M0UKD

Tonga DXpedition Award - To gain Tonga DXpedition Award it is necessary to have QSL confirmed contacts with two amateur radio expeditions from Tonga (A35), on two bands, with two diffrent modes. Available also to SWLs

Austria - OEVSV - Oesterreichischer Versuchssenderverband

SV8CS Spiros - Dx on Hf specially on low bands from Zante island Greece

PSK31 Web Receiver - These web receiver based in Kiew Ukraine show PSK31 activity on 20m band 14.070-14.074 MHz remotely by using a web browser. Requires java by the MixW team

Array Solutions - WX0B - Stacking and phasing HF and 6m arrays antenna switches and contesting devices. Custom low band antenna arrays, bandpass filters,commercial/Mil STd filters,microwave components, commercial broadcast filters.

Hamstick - Lakeview antennas, manufacturer of mobile antennas and accessories by WD4BUM, including colinear antennas, dual band, mounts and accessories. Maker of popular HamStick antennas.

KMA Antennas - KMA Antennas specializes in HF - VHF - UHF Log Periodic Antennas, unique antennas for the Six Meter band and custom antenna designs.

Barker & Williamson - Dipole antennas, unique broadband antennas, trap dipole antennas, coils, accessories for HF radio

MARS Antennas - MARS, Israel's Antenna and RF System manufacturer, flat antennas for cellular, military broadband, multiband MF high power antenna

HD Communications - Rf Connectors,RF Amplifiers,RF Filters,HF cable and accesories. Tower hardware valves and tubes

Kiwa - Filters and performance upgrades for many receivers

Nott Ltd. - All band 10 thru 80 meters antennas. Park 'n Talk telescoping whip antenna mounts, folded unipole antennas

Vectronics - Antennas, Filters, accessories, wattmeters, tuners and amplifiers.

2.4 GHz FM ATV - 2.4 ghz FM ATV experiment and equipment list

Amsat - ON - Amsat-on...Home of the k-band transponder

Online DX Logbook Priority listing - The latest tropical band and shortwave loggings. The site is updated at least once a day with new loggings

FT736 - Tuning control of the Yaesu FT-736R multiband VHF/UHF transceiver.

Tunekit - Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter

TVI and BCI Filters - TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.

Lowpass filter for 5MHz - The following lowpass filter was built using the tables in the arrl manual, it is a 5 section one and seems to work ok

Wide Band FM Tranceiver - 70 and 23 cm wide band FM tranceiver