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This antenna consists of 4 resonate dipoles made from 12 insulated copper electrical wire. The dipoles are resonate on the following bands: 6 meters, 10 meters, 12 meters and 17 meters. -
Homemade SWR PWR Meter based on Arduino -
Monitors the space weather parameters essential for HF radio, including SSN/SFI, Ap/Kp, X-ray/Proton flux, and Auroral activity. IonoProbe downloads near-real time satellite and ground station data, stores information for future use and displays it in a user-friendly way. -
That just about sums up many peoples attitude towards test equipment. Multimeter, SWR/Power Meter, Dip Oscillator, RF Signal Generator, Cathode Ray Oscilloscope -
This tutorial will set out the design stages required to design a theoretical microwave amplifier -
One popular rumor or thought is that antenna gain doubles every time we double the number of elements -
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Useful data-sheet on RG coax cables compiled by NA5N -
Spread Spectrum Scene. Radio Propagation notes, with downloadable files. -
A magnetic loop antenna calculator made with an excel sheet that run also with open office, let you design mag loop antenna dimensions by AA5TB -
An invisible magnetic loop antenna mounted under a table by PY1AHD -
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Build your own multi-band mobile ham antenna with a Hamstick -
A delta loop antenna for 6 meters band with SWR diagram , construction plan and some pictures by IZ8EWD in Italian -
A QRP 900 grams hydraulic tuned small magnetic loop antenna by PY1AHD Alex. -
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Building a Dummy Load and Measuring Power Accurately -
In this article the schematic is of AA5TB QRP power meter and dummy (50 Ohm) load combination -
Collection of mods for the Kenwood TS-850 -
Presents a detailed construction guide for a **Quadrifilar Helix Antenna** (QHA) optimized for 137 MHz, specifically for receiving weather satellite transmissions. The resource outlines the author's experience building previous QHA designs, highlighting challenges with tuning and nulls, and then focuses on a refined design by John Boyer, documented by Steve Blackmore, which proved easier to build and yielded superior reception. The guide provides precise element dimensions, including 1.5m of 32mm PVC pipe for the mast and 8mm soft copper tubing for the helix elements. It specifies lengths for horizontal tubes (190mm, 90mm) and helix elements (903mm, 1002mm), along with instructions for drilling, assembly, and forming a **balun** by wrapping RG58 coax around the mast. The text emphasizes critical steps like ensuring elements are square and twisting in the correct direction to avoid phase issues. It includes references to original QST articles by Buck Ruperto (W3KH) and the WxSat program for decoding satellite transmissions, contextualizing the antenna's purpose. The article concludes with a sample NOAA 12 image from September 1998, demonstrating the antenna's reception capabilities. -
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Operating Slow Scan Television (SSTV) on Apple macOS systems requires specialized software to encode and decode images for transmission over amateur radio frequencies. MultiScan 3B was an application designed for this purpose, enabling Mac users to engage in SSTV communications. It supported various popular SSTV modes, including Robot Black & Color, Scottie, Martin, PD modes (P3, P5, P7), and AVT, catering to a wide range of operational preferences and compatibility requirements within the SSTV community. The software's capabilities extended to both transmitting and receiving pictures, offering flexibility in how images were processed. Users could select regular, narrow, QRM, and narrow+QRM modes, allowing for adaptation to different band conditions and signal environments. This feature was particularly useful for mitigating interference and optimizing image quality during transmissions on HF bands. MultiScan 3B was built to run on Mac OS X 10.6 and later versions, providing a dedicated solution for Mac users interested in this classic digital mode. Its support for multiple modes and operational settings made it a versatile tool for SSTV enthusiasts. -
Lookup callsigns in locator, or locator of a specified callsign and display in google map -
Angle Linear has been producing GaAs FET preamplifiers since 1980 -
How to calculate "phasing line" lengths that actually work. -
A multi-mode QRP radio beacon built around the Arduino. This radio propagation beacon transmitter project is presented by M0XPD -
Low Cost Frequency Counter, Digital Display and DDS-VFO kits -
A project with several releases, of the Qkiller or QRM eliminator original project by DK9NL, in italian with schematics, picturs and movies -
A universal LF/MF preamplifier by Lyle Koehler, K0LR -
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Produce QSL & post cards, stickers, ID cards, calendars, certificates, awards, membership applications, log and call-books, rubber stamps,T-shirts, brochures, advertising materials. -
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LNA Technology High Performance Low Noise Preamplifiers for Amateur Radio, VHF-UHF weak signal, DX, EME, and commercial applications. -
A magnetic loop made just of wire. Suitable for portable usage and for QRP operations. -
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If you want to interface the IC-746 Pro or any other Icom rig with a computer for rig control, an outboard CI-V CAT device is required. -
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An efficient 2 meter antenna disguised as a TV Satellite dish. This vertically polarized horizontal slot antenna, cut into the reflector of a TV dish, might be the ultimate stealth antenna. -
Wireless radios from all eras Operating ham station - W1FGM Rivals museum at ARRL Hq. -
CB and ham radio dealer in spain -
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A multiband WebSDR receiver system, located in Bolton, England accessible via the RSGB web site -
Calculate Cable Loss from SWR and reverse. Text file with only two simply formulas -
Dutch scanner web contains information about dtmf pagers gsm tetra umts scanners decoders.
