frequencies 245.815

Practical Guanella 1:1 balun - This article proposes a lossy transmission line model of a practical Guanella 1:1 balun that is effective for all frequencies within and immediately adjacent to the pass band

Balcony and pedestrian mobile motor tuned loop - This antenna was designed to meet the requirements of a light body worn small magnetic loop covering all the frequencies continuously from 7 MHz to 29.4 MHz

ACTIVE Beacons <30 Mhz - List of all ACTIVE Amateur Radio Beacons on frequencies below 30 Mhz.

OH Beacons - List of OH beacons running on HF VHF and higher frequencies

The Considerate Operator's Frequency Guide - A guide to where on the HF bands various modes and activities are generally found. All frequencies are in MHz

Digital Operating Modes - Description, frequencies and sound samples of most popular amateur radio digital modes by DG8FBV

BandPlans.com - Have you ever wondered where different modes should be operated, what frequencies to avoid as a courtesy like SSTV etc? This site offer a database for known net frequencies,known segments for different modes, known beacons

JT65 HF JT65A HF Frequency Information - JT65A frequencies. List of common HF frequencies where you can work JT65A.

Frequencies for using digital modes - These frequencies are to be used as a guide to find the related signals. They have come from several sources, and are, in no way, guaranteed to be complete, accurate, or inclusive.

Hellschreiber frequencies - Suggested frequencies for HELLSCHREIBER operation by the feldhell club

Radiosonde : how to listen to them - Frequencies and location of every meteo radiosonde launching centres in Europe. Equipments, antennas, history, SondeMonitor and BalloonTrack tutorials

Olivia, the Magic Digital Mode - Olivia MFSK digital communications are becoming popular in amateur radio because Olivia is one of the most robust methods of text keyboarding, that can perform superbly for long distance communications. Olivia frequencies, format and software

Repeater operating procedure - Guidelines on operating on ham radio repeaters frequencies

AMSAT - AO-51 The Echo Project Page - AO-51 Project Summary and Status Updates. Operational frequencies, picture gallery, Decoding AO-51 Telemetry by Amsat site

VHF/UHF Propagation - In the past few years there has been a growing movement from VHF frequencies (50-300 MHz) to UHF (300-900 MHz). Many, however, have found the move fraught with difficulties.

Top 1000 SWL HF Frequencies - W4LGH collection of top frequencies to listen oh HF bands

Graham's scanner frequencies - Grahams Goldcoast Australia Radio Scanner Frequencies

Daraz Frequencies - Australian scanning frequencies

Frequenzdatenbank.de - Frequency database for Germany. Emergency services, aircrafts, radio and paging system with over 2000 frequencies from all over Germany.

Santa Barbara Scanner Frequencies - Frequency allocation in Santa Barbara California

Scanner Food - Scanner Frequencies - Tri-Cities Frequencies, Live Scanners, CTCSS information and more

Live Shortwave Radio Schedule - Dynamically generated shortwave radio schedule and world map. Updated hourly. Easy to read and use.

Filtroid - Filtroid is an extremely easy-to-use program for synthesizing microwave filters. It can be used to design practically all filter types from audio to microwave frequencies as well as amplitude and delay equalizers and attenuators.

Inductor Design Software - RF toroid - A free too designed to assist in the selection of iron and alloy powder cores. RF toroid calculate the location of the Self resonate frequencies for series and shunt inductors.

Interdigital bandpass filter designer - Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength