Search results

Round-Up of different HF Upconverters for RTLSDR by KF7LZE

Installing a classic G5RV Antenna in Slopinv-V mode by AI4WM

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

An omnidirectional and horizontally polarized VHF antenna by EA4EOZ

Antenna for limited space, made from 24AWG wire helically wrapped around the top element of a 3-element cane pole, is basically a fully-loaded vertical and performance are limited and should represent the last resort for extreme cases.

Pitcarin 2012 - VP6T Online log at clublog

This is a one for all antenna tuner with wide range tuning on all the HF bands. The tuner is based on a G3WQW design. DIY project by PD7MAA

The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.

Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers

The Speaky HF SSB transceiver and other homebrew projects Homebrew of radio equipment, antennas, tuner, etc.

A post about the construction and measurements of a Resonant Feedline Dipole cut for the 10M band

The page discusses the concept of a 2-element Parasitic Ground Plane antenna for the 40-meter band. It includes a conversation between amateur radio operators discussing modeling results and design considerations for the antenna. The author shares insights on radial configurations and the impact on antenna efficiency and pattern.

Shortwave listener blog from near Rome Italy

How to homemade a multi-band HF dipole using 100 meter of speaker wire, 2 strandsm including a homebrew 1:1 choke balun

A morse keyer project made on Arduino, inlcudes the main program script by m0xpd

Improve the stability of your Yaesu G-250 rotator.

Personal SWL log with various information from SWL tips and tricks to Frequecy Logs to general SWL information.

3W6C on-line log DXpedition 2010

Cushcraft A3S HF antenna 1:1 balun repair.

7O6T log oline - 7O6T Club Log

Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept

This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.

G4ILO compares popular antennas for 2 metre band handhelds so as to see how much you lose using a small inconspicuous antenna or how much you gain by using a long antenna.

Operating magnetic loop antennas requires careful consideration of RF safety, particularly regarding near-field magnetic field intensity. This resource presents calculations for magnetic field strength (H-field) at various distances from a magnetic loop, emphasizing that the H-field is significantly higher than the E-field in the near-field region due to the inductive nature of the radiating element. It provides specific formulas and examples for determining safe operating distances based on power levels and loop dimensions, crucial for compliance with RF exposure limits. The analysis compares calculated H-field values against FCC and ICNIRP maximum permissible exposure (MPE) limits for controlled and uncontrolled environments. It demonstrates that even at QRP power levels (e.g., 5W), the H-field can exceed MPE limits within a few feet of the antenna, necessitating greater separation distances than often assumed for electric field considerations. The practical application of these calculations helps amateur radio operators configure their stations to ensure personnel safety and regulatory compliance when deploying compact, high-Q magnetic loop antennas.

Articles about Amateur Radio, own writings and translations: history, DXpeditions, contesting and DXing ethics, Codes of Conduct, Suggestions for Pile-ups, Suggestions for Contesters, the most wanted DXCC entities.

Useful hints & tips on building a 10 and 17 meter Moxon Antenna

Testing performances of indoor antenna. A comparison of a magnetic loop antenna vs a classic wire dipole done using wsprlite on 30 meters band.

This antenna article is geared towards new Hams and antenna builders looking for a very inexpensive 6 band antenna that can be efficiently fed with 50 ohm coax without a tune

Ultra-lightweight 2m Yagi for SOTA

Adam Brown's Blog from Latitude 80.19 South Longitude 81.16 West

A fully equipped amateur radio mobile radio shack by VE6AB

How to receive JT-65 signals using a cheap RTL-SDR dongle with the 820T2 tuner chip

Stop common-mode current when transmitting with an end-fed antenna. Unbalanced antennas are very prone to currents on the outside of the coax.

Presents the construction of a 2-meter **Skeleton Slot Yagi** stack, detailing the design process and practical considerations for VHF operation. The author shares insights from building and testing this antenna, emphasizing its performance characteristics for local and extended range contacts. The project outlines the specific dimensions and materials used, providing a clear path for other radio amateurs to replicate or adapt the design for their own stations. The resource covers the unique aspects of the Skeleton Slot radiator, explaining how its geometry contributes to gain and pattern control. It includes discussions on impedance matching and feedline considerations crucial for optimizing power transfer and minimizing SWR. The article draws on real-world testing, offering practical results that validate the theoretical design. This project serves as a valuable reference for those interested in custom VHF antenna solutions.

Pictures and description of a SteppIr vertical antenna setup in a small backyard using DX Engineering radial plates.

The latest info on the world of radio including:world,shortwave,pirate,digital,mw,lw news,links.

Pictures and description of a homemade 1.3 GHz and 2.4 GHz RF Signal Source

A wire antenna feeded with an unsymmetrical feed and a 1:4 balun can be tuned from 6 to 80 meters band but can be noisier than a dipole and cause RF in the shack

An homebrew project of a full wave delta loop antenna for the 40 meters band with dimensione, picture and assembling instructions in Indonesian

An interesting article on choosing the right battery when operating in portable mode, considering charging time and modes, weight and size.

An comprehensive article on 40 meters antenna comparing vertical height to the resulting gain

Homebrewing dummy load by M0XPD

An interesting article about planning and testing beverage antennas for 80 and 160 meters in a rural location

A no ground antenna solution for backpackers, balconies or plastic car bodies, like RV or other portables uses where is difficult to find a good counterpoise by PD7MAA

Setting up a new antenna Mast for dipoles at VE3VN

KD8KSB realization of the CJU satellite antenna that allow similar performance to the arrow antennas.

An home made end fed half wave antenna with a tuner box by NG0R

Android app by VE3VN that show view of night, day and terminator around the globe. This gives a strong hint of which bands and compass directions to focus on for best results.

A complete restoration of a Heathkit SB-200 HF power amplifier

Testing log wire antennas and a unun by G0KYA