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Homebrew VNA capable of both transmission and reflection measurements from 0.05 to 60 MHz

Bird wattmeters and extras accessories

A moon tracking software capable to drive the rotation of your antennas in azimuth and elevation

The NiCd Lady Company has been in the business of assembly and distribution of batteries since 1994, supplying government, industry and retail with a wide variety of batteries, and production of assembled products.

Collection of audio clips of foreign radio stations, with identification announcements in various languages, signature tunes and jingles, and of course interval signals

Geographical atlas using radial projection

Designed to keep track of your club's roster

The GM3VLB Poor Man's Antenna Analyser

Mods collection for the Icom IC-7000 at mods.dk

This is an experimental CW transceiver for 80m, although the same idea will work on all HF bands

This Z-Match is a link coupled all-band tuner. Two all band tank circuits cover 3-14mhz and 14-30mhz. The tank output links are selected with a very heavy duty SPDT rotary switch.

The original article of the progressive system, composed by a direct conversion receiver and multiband superetherodyne by W7ZOI and K5IRK

Otto engineering is comprised of two divisions otto controls and otto communications. otto controls designs and manufactures a full line of switches and grips used in heavy equipment, aerospace, marine, medical and other demanding applications. otto communications designs and manufactures audio accessories for two-way radios used in public safety, police, fire, retail, hospitality manufacturing and other markets.

G0KYA experience on hustler 5 BTV antenna

NN1G 30m 1W QRP transceiver by AA5TB

Antique Radio Tubes Sell antique radio tubes, over a thousand different radio tubes in stock

Macintosh shareware, contains the full pool of questions for each of the five exams, and creates sample tests that will vary each time you take them and it will grade your exam.

Juste a little demo of the Kenwood TS-570 transceiver by F5UFX

Electronic surplus dealer

An amateur radio contest log sheet printable in A4 format, useful for portable operations, free to download PDF File.

Demonstrates the construction and implementation of a **two-element phased vertical array** for 40 meters, utilizing _Christman phasing_ techniques. The author, W4NFR, details the process from building individual 1/4-wave aluminum verticals to integrating them into a phased system. The resource covers antenna spacing of 32 feet, elevated radial design, and the critical steps for tuning each vertical to achieve a 1.1:1 SWR before combining them. It also provides insights into calculating precise coax lengths for feedlines and the phasing delay line, emphasizing the use of an MFJ-269 Antenna Analyzer for verification. The finished system exhibits good front-to-back nulls, with an overall SWR ranging from 1.6:1 to 2.2:1, which is managed by an antenna tuner. The project includes detailed photos of the relay box, showing 12 VDC relays capable of handling 5KV, and the control box in the shack for switching between three different antenna pattern configurations. Static bleed-off chokes are incorporated for protection, and the construction emphasizes robust weatherproofing for outdoor elements.

Comprehensive information page about bi-directional Beverages, including applications, construction details, and tips.

Practical applications for end-fed antenna transformers and safe, effective grounding

Using bencher and Kenwood TS-50

Supplier of Radio Telescopes and associated equipment since 1994.

A homemade tunable bandpass filter for all HF bands from 160m to 10m

Calculating HF helical whip antenna for mobile or portable operation

FT100: the yaesu ft-100 yahoo group

This project details the construction of a **full-sized 40-meter vertical antenna**, born from a renewed interest in 7 MHz operation and a desire for improved effectiveness over simple dipoles. The author, K5DKZ, initially focused on VHF experimentation, which provided an inventory of aluminum tubing and fiberglass spreaders for this endeavor. Before this vertical, K5DKZ utilized an 80/40 meter inverted-vee trap dipole and a 40-meter broadband dipole, but now primarily uses a pair of full-sized, phased, quarter-wave verticals spaced 35 feet apart for serious 40-meter work. The construction involves a base-heavy design for stability, using a 44.5-inch section of 1-1/4 inch steel TV mast driven into 1-3/8 inch aluminum tubing, insulated by a 105-inch section of Schedule 40 PVC pipe. The assembly reaches 31 feet, close to the 32 feet required for a quarter-wavelength on 40 meters, with fine-tuning achieved by winding wire onto a fiberglass spreader. The design is explicitly presented as a foundation for a two-element 40-meter Yagi beam, outlining modifications like substituting aluminum for steel in the base and using an inductive hairpin match for the driven element. The article also discusses tuning considerations for a large 40-meter beam, noting the 100 to 200 kHz upward frequency shift when raised, and suggesting methods for installation on a tower. The author emphasizes the cost-effectiveness and good performance of the monopole approach, especially when multiple verticals are needed.

The information in this article has come from many amateur sources, the most notable was from WA6TEY (sk 1985) Ray Frost, who was a pioneer of VHF Quad designs and one of the best Southern California Transmitter Hunters. Ray built hundreds two meter quads in single and paired configurations as well as his famous mobile radio direction finding quad.

Over two decades ago, the Kenwood TS-850S HF transceiver established itself as a robust performer, known for its excellent receiver and versatile operating features. This vintage rig, often found on the used market, continues to be a favorite among many amateur radio operators for its solid construction and reliable performance across the HF bands. Adrian's Yahoo! Group provided a dedicated forum for TS-850S owners to exchange insights, troubleshoot issues, and share modifications or operational tips. Such community-driven platforms were crucial for extending the operational life and maximizing the utility of classic transceivers, fostering a spirit of mutual aid among hams. Discussions frequently covered topics like DSP unit upgrades, common repair challenges, and optimizing the rig for contesting or DXing, reflecting the enduring interest in this particular Kenwood model.

The Rock-Mite is a 40m CW kit offered by Small Wonder Labs . It features built-in keyer, direct conversion receiver with a crystal RF bandpass filter, 500 milliwatts of power, and switchable frequency offsets to work around QRM

Wiring Color Code and Pinouts for IC-706MkIIG and HM-103 Mic

Powerful application that supplies PIC developers with user-friendly graphical development environment for Windows with integrated simulator (emulator), Basic compiler, assembler, disassembler and debugge

A comeplete home made 600W LDMOS RF power amplifier. Settings can be made on a 7-inch touch screen, and on this screen you can see a lot of useful information during operation, such as output power, temperature, SWR, and so on. The power amplifier includes 2 MRF300 LDMOS FETs and several built-in sensors. The amplifier also contains several types of protection functions like too high current, too high swr, too high temperature, etc.

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

Discussion group dedicated to those who enjoy monitoring radio frequencies in the VLF radio spectrum and slightly below the VLF spectrum (3-30 KHz).

Two meter band antenna

A group of hams decided to make those wishes come true and founded the Straight Key Century Club - a/k/a SKCC.

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

Manufacturer of Radio Scanner receivers, scanner accessories, LCD Display modules and GINA data radio modems

Los Angeles County Disaster Communications Service a public service organization using Amateur Radio

dxing.com explains utc time and gmt conversions to local time

Yet another wiki page about the yaesu VX-2 hand-held transceiver.

Istructions to use the IFD demodulator

QSL Information, many links for DX and IOTA

Homebrew Light-weight Open-wire feedline for Portable Ops by N5ESE

SCARA is active in various events throughout the year. Helping as a public service with communications at various events has been a strong point for our club

A page by 9A7PJT dedicated to HB9CV yagi antennas includes link to the HB9CV calculator program and some interesting plans

The NL Ham Radio Swap Shop is an online platform dedicated to connecting amateur radio operators in Newfoundland and Labrador with opportunities to buy, sell, and trade radio equipment. This service caters to both seasoned operators and newcomers, providing a space for exchanging second-hand gear, military radios, antique radios, and radio tubes. Users can browse listings, post their own items, and find unique equipment that may not be available in traditional retail outlets. In addition to facilitating transactions, the Swap Shop also serves as a community hub for local hams. It encourages networking among operators, sharing of knowledge, and collaboration on projects. Whether you are looking for a rare piece of equipment or simply want to declutter your shack, the NL Ham Radio Swap Shop is an essential resource for anyone involved in the amateur radio hobby in the region.