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Bird wattmeters and extras accessories

A magnetic loop antenna working from 30 to 15 meters with 100W

A Moxon rectangle antenna for 2 meters

An Halo antenna for the six meters band in French

Microstrip Patch Antenna Calculator determines the length and width in millimeters of a rectangular patch antenna.

An homemade fan dipole antenna for 20 30 40 meter bands, setup in a 15 meter wide garden. The longest leg for 40 meter is folded to fit in the 7.5 m

An article on SO-239 connector-based-antenna for 2 meters and 70 cm band by David White, WA7YFF

A wire dipole antenna for 80 meters band

Lights on why 160 meters is so unpredictable and what is being done to reveal its secrets

G0KYA review of the EH antenna for 20 meters band

A project of a small antenna, just 50 cm for the 7 MHz band. An EH Antenna plan for the 40 meters band

The grounded half loop describe in this article is basically a half wave length wire on 80 Meters. The 80M grounded half loop antenna, inspired by a 1984 QST article by SM0AQW, is a compact solution for limited spaces. Comprising a 127-foot wire fed against ground and supported by radials, it balances performance and practicality. Despite compromises in length and proximity to structures, the antenna delivers strong signal reports and effective multi-band tuning using an SGC 237 antenna coupler. Ideal for CW operation, it offers low SWR on 80-10M, though noise levels and safety considerations warrant attention. This versatile design excels in constrained environments.

An home made slim jim antenna for 2 meters band by VU2TQC

Maker of optical spectrum analyzers, digital oscilloscope, digital power meters and more test equipmente related products

PC-based oscilloscopes, data acquisition and data logger products, spectrum analyzers and voltmeters

This is the schematic of asolid-state 7 MHz QRP CW transmitter by VU2NAN

A 5 elements homemade DK7ZB yagi antenna for 4 meters band based on a 50MHz TONNA

The 80m TX described here is the well known ON7YD ATX-80 and timer, combined and re-engineered to fit a readily available enclosure by G3ZOI

An homebrew project for a 3 element coil-loaded Yagi beam antenna for 40 Meter band

A Home made QRP tuner for 10-40 meters

Homebrewed transceiver for 20 meter originally born for 17 meters band

A Wire resonant loop antenna for 160 meters band article by N4KC

A lightweight portable vertical antenna for 40m

A monster magnetic loop antenna for 160 meters band. This Magnetic loop is optimized for 1840 Khz + 50 Khz. PDF Article published on La Radiospecola 10.22

80-meter peilontvanger / receiver includes printed circuit sample and list of components

A 2 element Narrow Diamond Loop Array for 40 Meters by VE3VN

Modelling an horizontal Loop antenna at 3.5 MHz

A three band short Vee antenna is feasible with two legs per side on a dipole. 10-15-20 meters by W8HDU

80 to 6 meters, 2 KW, designed to be used at heights of only 25 to 45 feet, includes a twenty foot long vertical radiator

The Receiver Test Data resource is a detailed review database focusing on the performance metrics of various radio receivers. The methodology involves rigorous lab measurements, often adhering to standards such as the ARRL RMDR (Reciprocal Mixing Dynamic Range) and BDR (Blocking Dynamic Range). Specific test equipment and protocols are utilized to assess parameters like noise floor (dBm), AGC threshold (uV), and LO noise (dBc/Hz). For example, the _Icom IC-7300_ is evaluated with a noise floor of **-133 dBm** and an LO noise of **-141 dBc/Hz**, providing insights into its performance under different operational conditions. The resource includes a wide range of models, from the _Elecraft K3S_ to the _Yaesu FTdx-101D_, each tested for dynamic range, sensitivity, and selectivity. The data is sorted by key metrics such as third-order dynamic range and phase noise limitations, with RMDR values calculated by subtracting 27 dB from LO noise figures. This structured approach allows users to compare different receivers' capabilities, focusing on technical specifications and performance outcomes in various scenarios. DXZone Focus: Review Database | Lab Measurements | -133 dBm | ARRL RMDR

EF0603S is a 3 element portable yagi antenna for six meters band by YU7EF

Homebrew project of a windom antenna, an off center fed dipole, resonating from 10 to 80 meters

Phased wire vertical antennas for 40 meters band

A Co-ax Trap Dipole For 40, 30 and 20 Meters or at last that was the intention

A magnetic loops for HF pedestrian mobile project by VK3YE

A vertical antenna for Six Meters band

Includes W1BB Stew Perry letters, and a sample QSL cards of dated 1963

Test equipment maker, digital oscilloscopes, generators and counters, multimeters, logic probes testers and more

Antenna model for a diamond loop wire antenna for the 40 meter band

A small sized and very cheap antenna project that allow you to work on WARC bands with a total gain very close to the dipole in both bands. On 12 meters is a normal dipole, while on 17 is a trapped dipole. Article in Italian

An homebrew project for a 4 elements yagi monoband antenna for the 10 meters by 9M2MSO

A 5 element yagi beam antenna for ten meters band with full dimentsions, eznec file and coax match informations for 50 ohms feed line

A multiband coax trapped dipole for 10-80 meters bands by DF1PU

An high gain long yagi antenna, seven elements, for six meters band

Flag antenna project for 160 meters band

Delta loop antennas for 40 meters plans and comparison of some models

A presentation of a HF multi-band sloper antenna. This antenna project is for low band operations, and antenna presented in this article works on 40 80 and 160 meters band. Article is in Polish.

This page presents a curated list of individuals who have made significant contributions across various fields while also being active amateur radio operators. For instance, Dr. Joseph H. Taylor, co-winner of the 1993 Nobel Prize in Physics for the discovery of binary pulsars, is recognized for developing the _WSPR_ and _WSJT_ weak signal mode software. Similarly, Wilson Greatbatch, inventor of the cardiac pacemaker with over **150 patents**, is featured. The resource details the diverse backgrounds of these hams, from Professor Donald H. Menzel, an astrophysicist at Harvard, to Hiram Percy Maxim, often called "The Father of Amateur Radio," who also pioneered in the automobile and aviation industries. King Hussein of Jordan, JY1, is noted for his active participation on 20 meters, engaging with fellow amateurs like Pat Kilroy, WD8LAQ. Other entries include Arthur M. Young, designer of Bell Helicopter's first model, and Marlon Brando, KE6PZH/FO5GJ, known for operating from his private island in French Polynesia. Peggy Sue Gerron-Rackham, K5PSG, gained her license after a special event station, demonstrating the hobby's broad appeal.

A small Z-Match tuner, BLT, Balanced Line Tuner is a simple Z-Match tuner that works from 10-40 meters

A project that describes a build a multiband wire beam antenna. A 3 band single feed moxon antenna for 20,15,10 meters.