frequency interference

Comparison of Beverage antenna - A ranking of receiving antennas based on noise being evenly distributed in all directions. These rankings are most accurate in the frequency range of AM broadcast, 160 or 80 meter bands

Transmission Lines - Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.

Interference Cancelling System - The use of interference signal cancellation has been around for some time. The idea is to use an auxiliary antenna almost any random length of wire in addition to the main receiving antenna

Pipo Communications - The highest-quality and most reliable Dual-Tone Multi frequency encoders.

DCI Digital Communications - Band pass filters, for radio frequency interference problems.

K2RF Communications Products - K2RF is a manufacturer of radio frequency, audio, and video processing products including repeater link controllers, speech limiters, and RF equipment for the commercial, HAM, and amateur radio consumer.

American Technical Resources - Heavy Duty Surge Suppressors, telecommunications protection, industrial twist lock enabled equipment all voltage, phase and frequency ranges

Frequency Counter for VHF/UHF - DFD4A for bench top test equipment, has a built-in prescaler good to more than 3 GHz.

About digital modes - The digital modes provide a wonderful opportunity for those of us who would like to work on the HF bands but find CW too difficult and SSB phone prohibitive because of interference problems. The digital modes are easy to set up and get operating, require low power and a narrow band.

US Frequency allocations - Searchable database of frequency allocations in the US, from cellular frequencies, paging frequencies to marittime and microwave frequencies.

Recommended frequencies for digital modes - Active digital mode frequency list compiled by Jason Buchanan - N1SU

Mixed-Mode Operation on Voice Repeaters - Mixed-mode operation, where voice and digital transmissions are used in turn on the same frequency

Frekvenser.se Swedish frequency list - On of the best Swedish frequency lists, in swedish

Las Vegas Scanner Frequencies - These are some of the frequencies that you can listen to when you are in Vegas with your radio scanner. Includes metro, police, fire dept.

Missouri/Kansas Scanner Radio - Provides comprehensive frequency listings for various public safety agencies and private organizations who operate across the Kansas and Missouri Region.

BSF Taiwan - Nation Standard Time and Frequency Laboratory Telecommunication Laboratories (TL) ChungHwa Telecom Co. Ltd.

EiBi Schedules  ^updated - Regularly update shortwave schedules of all international broadcasters listed by time or frequency; for free.

WD6CNF DSP Filter - Audio Digital Filter, two bandpass filters, three notch filters, two noise filters graphical setting of filter center frequency and bandwidth Drag vertical lines on top of signal, Microphone input, speaker output Mono, 5 kHz bandwidth

RigResident - RigResident is a small program for RIG control, which does allow to set and read data of connected tranceiver (frequency, mode etc). RigResident supports more than 70 TRX models from ICOM, KENWOOD, YAESU and Ten-Tec.

HalloSat AO-40 Special Edition - Freeware Tracking Program for AO-40.Based on Windows timesetting, thus automatic switching between normal and daylight saving time. Preview listings with a view to the passband schedule, to the squint angle and elevation. Integrated frequency calculation for transmit frequency (uplink) depending on receive frequency (downlink) with a view to dopplershift. CAT – Control for all Icom – Transceivers without IC-821.

SpectraScope - SpectraScope is a simple Windows interface program allowing your computer to view up to two audio waveforms in either the time or frequency domain. The program is a Windows soft panel operating as a dual channel oscilloscope and spectrum analyzer. The useful frequency of operation is 20 to 10,000 Hz in the time domain and 20 to 20,000 Hz in the frequency domain. The program uses the computer sound card to capture the audio input.

RF and Microwate Power Amplifiers - RF and Microwave Power Amplifier and Transmitter Technologies, amplifierlinearity, efficiency and available RF power devices.

Open-channel - A CB radio website aimed mainly at the UK market including help, tips, repairs, mic wiring, frequency charts, chat forum,rig doctor listing, mail order shops and much much more

Coaxial Cable & Power Handling - This calculator can be used to estimate the attenuation (dB loss), power handling capability, and transmission efficiency for some of the more popular Wireless Communications and MIL Spec cables at the frequency of interest

Ferrite on Reducing RFI - Using ferrite to reduce radio frequency interference with your PC monitor or antennas with your receivers or transceivers.