transmission lines

Antennas and Feedlines - Long article on antennad and feed lines

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.

Transmission Lines - Articles on SWR measurements and feed lines tuning.

Transmission lines for dummies - Myths and basic truths on transmission lines

Auckland ATV Group - The ATV User's Group is a subgroup of the Auckland VHF Group, Club call ZL1BQ, compromising of persons interested in the transmission and reception of Amateur Television

CW Buffer, Amplifier & Preamp Sequencer - The AMPSEQUENCER board is an advanced microprocessor driven control board specifically designed to buffer CW key signals while switching the amplifier to transmission, it can also be used to provide proper TX delay timing for RTTY and Pre-Amplifier proper sequencing

Fax480 - FAX480 was developed to provide for relatively high resolution image transmission on HF, VHF, and UHF amateur radio bands. FAX480 was designed to bridge the gap between conventional slow scan television (SSTV) and conventional facsimile techniques.

PSK63 - A super-fast PSK mode for RTTY Contesting, 100 wpm character transmission speed for contest exchanges and macro transmission versus RTTY at 60 wpm

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

Shortwave Spy Numbers Stations - Shortwave spy numbers stations types, schedule of transmissions

Introduction to Spy Numbers Transmissions - Introduction to Spy Numbers Transmissions

Listen to the world - List of English language transmissions - Sohl List of English language transmissions

Acarsd - acarsd is an ACARS decoder for a LINUX or Windows PC which attempts to decode ACARS transmissions in real-time using up to three Soundcards. acarsd is also a realtime ACARS Server, for the worldwide spotter and ACARS community.

Smith Chart Software - SimSmith is a highly interactive, real time Smith chart graphing program. Circuits are constructed using drag-n-drop. Load files can be imported from the EZNEC and CocoaNEC antenna simulation software and from the AIM4170 and miniVNApro antenna analyzers. Circuits and load files can be of any size. Key Features: SimSmith is one of the few Smith chart packages which models transmission line losses. SimSmith also allows the description of circuit elements using algebraic equations. SimSmith has only one screen and allows the screen to be resized to increase workspace or readability.

TLE for windows - Transmission Line equations for Windows. Written in Visual C++. This program provides the most comprehensive analysis of a transmission line by w9dmk

XLZIZL by AC6LA - XLZIZL is an Excel application that analyzes the components of an antenna feed system, including transmission lines, stubs, baluns, and tuners. Calculations include impedance transforms, SWR and reflection coefficient, power loss, voltage and current standing waves, stress on tuner components, network attenuation (S21), and return loss Analysis results are available in worksheet format and in five different chart formats, including Smith charts.

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

DigiACE - DigiACE is an experimental Digital SSTV system. The latest version is posted as DigiACE.zip DigiACE uses the RDFT transmission system with some enhancements

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

RF Coaxial Connectors - RF coax(ial) connectors are a vital link in the radio spectrum. Coax connectors are often used to interface two units such as the antenna to a transmission line, a receiver or a transmitter. The proper choice of a coax connector will facilitate this interface.

Safety: RF awarness guidelines - Although Amateur Radio is basically a safe activity, in recent years there has been considerable discussion and concern about the possible hazards of electromagnetic radiation (EMR), including both RF energy and power frequency (50-60 Hz) electromagnetic fields. This section summarizes what is now known and offers safety precautions based on the research to date.

VK5VKA 's non technical bpl/plc information - VK5VKA page contains general information and comment on "BPL" (Broadband over Power Lines) or as it is known elsewhere "PLC" (Power Line Communications).

Broadband over power lines - VK1OD informations on BPL

Broadband news: EU sets bpl guidelines - The EU has followed the U.S. lead in clarifying rules surrounding BPL (broadband via power-line) technology

Eetimes.com EU urged to push BPL - European regulators are urging governments and industry to increase R&D efforts into and deployment of broadband over power lines to homes and small businesses