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Antennas : 80M
YLRADIO - Full wave delta loop
- This Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees. Recommended height is 40 feet or more at highest point, but higher is better.
80 m 3/4 wave LLV
- This is a vertically polarized Phased array. The left Vertical wire is 180 degrees out of phase
The Impact of Current Distribution on Array Patterns
- Technical Correspondence, QST, July 1990 - Why even "perfect" phased array element currents don't produce perfect patterns.
The simplest phased array feed system that works
- How to calculate "phasing line" lengths that actually work.
K5UA 40 meter Phased Array
- The intent of this site to share information about the design of a 40 meter horizontal phased array antenna.
An automatically tuned 7-30MHz mobile antenna
- This is a base-loaded vertical antenna that mounts on the car's roof. The loading coil is designed as a variable inductor, with a three-legged chariot that travels up and down inside the coil, with grooved brass wheels running on the coil turns, and driven by a slotted rotor tube.
70cm Quagi antenna
- Building a 70cm Quagi to Work AO-51 by K6JEB
6m Half wave vertical
- This antenna is very useful for receiving or scanning purposes, but you can use it for transmitting, too. It is 2,94m long and has a pi-configuration (Collins-Filter) for the matching.
eham DX Spots
- DX Spots web cluster interface with filtering features available to eham subscribers
Orlando Florida live scanner
pop
- Public safety scanner feed from Orlando Fl
Heinz Bolli AG
- Antenna tuners, components, filters and baluns manufacturer based in germany
Communication Concepts, Inc.
- Provide components to the amateur who wants to construct their own gear and to the professional who wants to save money and time in prototyping their circuit design, Filters, HF Amplifiers, Splitter Combiners, VHF Amplifiers, ATV
International Crystal Manufacturing Company
- International crystal manufacturing provides quartz crystals, oscillators, precision crystals, filters, tcxos / vctcxos, qcm crystals, and other frequency control products. read details about our crystals and frequency control products and services.
Digital DX Live
- DX Spots of digital emissions
AF Filter for FT-897D
- AF Filter modification for the Yaesu FT-897D by Petr OK1FIG
All American
- Distributor of electronic components, ull range of semiconductors (active components), including relays, circuit breakers, transistors, diodes, memory devices, microprocessors, microcontrollers, and other integrated cuircuits, as well as passive components, such as capacitors, resistors, inductors, and electromechanical products, including cable, switches, connectors, filters, and sockets.
WBCQ The Planet
- This summer, WBCQ is running The Voice of the M/S Katie, live radio broadcasts originating from our radio ship the M/S Katie in Boston, Massachusetts. WBCQ broadcasts 50,000 watts on each of its four international shortwave transmitters on 5.110, 7.415, 9.330 and 18.910 MHz
JavaScript Electronic Notebook, K7MEM
- It consists of a group of JavaScript® driven web pages that are intended for use as a quick reference for Ham Radio operators or just anyone interested in electronics. Offer calculators for Resistors, capacitors, inductors, power supplies, filters, attenuators and antennas
FreqTweak
- FreqTweak is a tool for FFT-based realtime audio spectral manipulation and display for Linux. It provides several algorithms for processing audio data in the frequency domain and a highly interactive GUI to manipulate the associated filters for each. It also provides high-resolution spectral displays in the form of scrolling-raster spectrograms and energy vs frequency plots displaying both pre- and post-processed spectra.
DigChip IC database
- Provider of electronic components documentation. Offer a reliable tool to find semiconductors components technical information like parts, datasheets, cross reference, obsolete and new circuits.
A diode-switched band-pass filter
- High speed silicn diodes work well as RF switches. This article describes how to use diodes for selecting two or more filters ARRL QST article by W1FB
Band filters by PA9M
- Band filters for PA6Z made by PA9M, designed by W3NQN.
Television channel 11 interference.
- Solving interference from television channel 11 on 144MHz transverters by Chris Cox, NØUK, G4JEC
Filters and Ferrites in EMC
- This article is about the characteristics and use of various filters and ferrites for solving amateur radio electromagnetic compatibility problems involving breakthrough of amateur signals into domestic equipment such as television sets, video recorders stereo sytems etc.
50MHz-Transverter 10m/6m from DK7ZB
- This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files
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three phase emi filter
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