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A vertical portable antenna system by W0SJS that will work on 40, 30, 20, 17 and 15 meters

A project of a vertical and wires that generate a multiband antenna for 28 14 10 and 7 Mhz in french

A very short dipole with a good radiation efficiently plus a respectable bandwidth by S. C. Chuck Smith, WA7RAI

CTCSS Decoder and Encoder, DTMF Decoder projects

Will we ever be able to dispel the myths? Steve Katz, WB2WIK/6

A Quagi antenna project with pictures and dimensions for a UHF Quagi antenna

Demonstrates the construction and measurement of a single-turn HF receiving loop antenna, built from common materials like electrical conduit and lamp cord. The resource details the physical dimensions, including a 4-meter circumference, and calculates the theoretical inductance at approximately _6.4 uH_. It outlines a method for determining resonant frequencies across the 4-17 MHz range using a _C Jig_ and a _VR-500 receiver_, coupling the loop with a ferrite ring. The article also discusses the impact of receiver coupling on the loop's Q factor, noting a degradation in sharpness due to the transformer's reflected impedance. Analyzes the observed resonant frequency patterns, highlighting an unexpected rise in the loop's effective inductance at higher frequencies, particularly above 13 MHz. While some increase is attributed to distributed capacitance, the rate of rise suggests further investigation. The experimental setup provides practical insights into the challenges of maintaining high Q in simple receiving loops and offers a comparative reference for other homebrew antenna projects, such as those by _VK2TPM_.

How to Operate Ham Radio on a Linux Workstation

Frank Donavan, W3LPL , discusses beverages on the CQ-Contest reflector. This is a reprint of Frank's message.

W0RW article that guide you to using beacons to determine dead bands or upcoming propagation openings.

Ameritron Al-811H Tuning for Power/Dissipation/Linearity, and More Generally 811A Tube Amps in Grounded Grid

How could we share the Beverage antennas on more than one station using this homemade remote antenna switch, a project by TK5EP

James Miller G3RUH article on amsat site

The UK amateur radio licensing scheme features three distinct tiers: Foundation, Intermediate, and Full, each granting specific operating privileges. For instance, the **Foundation Licence** permits a maximum of 10 watts output power on most allocated bands, with restricted band access. The Intermediate Licence allows up to 50 watts, while the **Full Licence** grants access to the maximum UK legal power limits and all available amateur radio band allocations. UK call sign prefixes and formats provide insights into the licensee's class and the approximate issuance date. For example, M3, M6, and M7 prefixes with three letters denote Foundation Licences issued from 2002, 2008, and 2018 respectively. Intermediate Licences, often starting with "2E0" or "2E1" followed by three letters, were issued from 1991 onwards. Full Licences encompass a broader range of prefixes like G2, G3, G4, G0, and M0, with varying letter counts indicating different historical license classes and issuance periods, such as G3 plus three letters issued between 1946 and 1971. Special prefixes like GB are reserved for repeaters, beacons, data mailboxes, and special event stations, with specific numerical sequences (e.g., GB3 for repeaters, GB7 for data repeaters/mailboxes) indicating their function. Optional prefixes such as GC, GD, GI, GM, and GW denote specific UK countries (e.g., Wales, Isle of Man, Northern Ireland, Scotland, England) and can also signify club stations.

A 9 band stealthy Fly-By-Night Antenna Eham article by N4UM

Article using a full wave delta loop antenna at low height, feeding methods, performance reports on 1984 QST article by W1FB and W1SE

Are you having RF problems in the shack since you put up your HF vertical antenna? This is a common problem with an easy solution.

Problems using the tuner interface in the ICOM IC7000

Why twinlead isn't necessarily a low loss feed line.

An extension of the excellent decoding software JT65 HF by Joe W6CQZ for amateur radio digital mode JT65

Adjusting audio output of your soundcard to obtain a perfect PSK signal from your transmission. A project to help you tuning your PSK31 emission.

Make your own loading coils for antenna projects using Caterpillar Grommet strips.

A portable amateur radio station which the radio amateur can take when asked to go to an event which needs support with radio communication.

Extension to an existing fan dipole originally modeled for 40 20 and 6 meters. This modification will add 80 15 and 10 meter bands.

The Fence Fan Dipole a quick, easy and inexpensive multiband dipole antenna

A Slinky-based doublet or loaded vertical QRP antenna tested for 40 meters band

This publications page lists articles on surface mount devices, amateur radio, soldering, shunts, and measuring large direct currents.

Yaesu FT-1000MP Mark V Field review by W4TI

Experiments on remote receiving loops antenna by Lyle Koehler, K0LR

About the clemens match for beam antenna, as an alternative to common gamma matching techniques

Microphone wiring for Yaesu FT-757 GX II

Durable Easy To Build 4 Element 6 Meter Quad Or 6N2 Or 4 Element 6 And 5 Element 2 Permanent Or Portable you decide based on your needs By WA8UEG

A page in french dedicated to the double bazooka antenna, with a short history of this antenna model and main characteristics including a comparison versus the dipole antenna and formulas to determine elements size.

The 2BCX Slim Jim by F.C. JUDD, G2BCX.

Two meter band antenna

A 5/8 wave antenna, can be fed with ladder line from the center insulator to tuner.

A 2 element small footprint 40 meter phased, reversible, downsized quad array antenna.

This type of filter can be used in a Mode J satellite station (uplink on 2m, downlink on 70cm) to reduce the problem of the uplink signal desensing the receiver

The Remote Control Antenna Switch consists of two circuit boards. The control unit and the remotely controlled switch

Delta 160-meter receiving antenna used at FO0AAA

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

Measurements for building a full wave loop using wire

Analyzing a decade of contest operations and QSLing from March 1993 to March 2003, K5ZD presents data on QSO totals by band and mode, QSL error rates, and DXCC progress. The article details the author's methodology of only answering incoming QSLs, which allowed for a study of call copying error rates, found to be between 0.8% and 1.7%. These error rates correlate with typical contest log checking reports (UBN/LCR). The data also tracks the percentage of QSOs confirmed by QSL cards annually, averaging 12.1% over the ten-year period, with a steady rate of 14-15% in earlier years. Specific statistics include a total of 215,653 QSOs logged, with 26,184 QSLs received. The article identifies the top 33 countries for incoming QSLs, accounting for over 87% of the total, with Japan, Germany, Spain, and Belgium being prominent. It also touches upon the potential of ARRL's Logbook of the World (LoTW) for instant confirmations, while noting potential error rate implications. The author's station, initially a barefoot setup with a Hygain multi-band vertical, evolved into a fully operational contest station by October 1993, utilizing DX4WIN for logging.

An overview of some of the ways, and the key tips on how electronics soldered joints can be unsoldered or desoldered.

Competent all-around 2-meter mobile transceiver, review by W4TI

Dish antenna and its theory and design for high performance applications such as satellite transmission and reception as well as microwave links. Parabolic Reflector Antenna: Dish Antenna The parabolic reflector antenna which is often called the dish antenna provides an antenna solution applicable for VHF and above where high gain and directivity are needed for all type of radio communications and radio reception.

The Double 5/8 is a natural extension of the Single 5/8 and uses a 5/8λ element for both the top and bottom radiators.

Alan Applegate (K0BG) article on mobile oprtations

Quarter wave omni-directional spider antenna for 2.4GHz 802.11b

PalmProp is a software for PalmOs dedicated to the forcast of HF radiowave propagation by f5hla