dc filter

QSL collection - World's largest collection of amateur radio and broadcast stations' QSL cards and awards

OE1002419 Kurt Brandstetter - Page with pictures of my boatanchors and QSL's from Ham Radio, Broadcast and Utility stations. Over 330 DXCC countries. QSL Info Page with a lot of search engines for QSL Info servers. Broadcast and Utility QSL's.

RSGB HF Data Band Plans - The following frequencies are assigned to datacommunications in the HF bands within the UK By RSGB data communications committee information.

MM0BQM Priority listing - MM0BQM Homepage, lots of info on most soundcard data modes plus received SSTV picture gallery.

RM Italy  ^{updated  pop} - RM is an Italian company operating in the radio communication field since 1974, main products are: HF-CB-VHF-UHF-Dual Band Amplifier, Power Supply, DC-DC Converters Antennas and more

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.

Adaptive Broadband Corporation - Point-to-point fixed and mobile microwave radios for television and other broadcast requirements

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

Broadcast microwave services - Designs and manufactures a comprehensive line of microwave communications equipment for television broadcast, video, telemetry, and electronic surveillance applications.

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

CIA World Factbook - Country maps and flags and detailed informations about almost all countries of the world

ACA frequency database - Australian frequency database

The World Clock - Real time world clock

VHF UHF Microwave Radio Propagation - Notes on radio propagation in that part of the spectrum (upper VHF to microwave) used by experimenters for high-speed digital transmission

How to use geophysical alert broadcasts - User's Guide is primarily based on information made available by the United States National Oceanic and Atmospheric Administration's Space Environment Services Center in Boulder, Colorado.

Low Power Broadcasting - Low power broadcasting frequently asked questions by Rick Harrison

Spectran - Program designed to do spectral analysis and real-time audio filtering on reception of audio signals for EME, VLF, SETI applications. Offer support for MTHELL, QRSS, DFCW, NDB, WSJT by I2PHD

RDCP/Mac - RDCP/Mac is a communications software package to interface your Macintosh to models of Kantronics TNCs. RDCP/Mac uses the Kantronics HOST mode allowing simultaneous connections on VHF packet and the HF digital modes when using the KAM.

FFTDSP  ^pop - FFTDSP is a PC program which can detect weak radio signals in real time. Uses the PC's soundcard and advanced signal processing techniques, extracts and displays weak signals from the receiver audio.

WXSat - WXSat for Windows 3.1/95/NT, decodes the signals in the APT format from NOAA, Meteor, Okean, Resurs, Meteosat and GOES Satellites (AM) with a Soundcard. WXSat can decode also FM-Fax for decoding facsimile-signals transmitting via shortwave

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

KI5YN QLF Filter - The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter