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Calculate Cable Loss from SWR and reverse. Text file with only two simply formulas

This free program by SP7DQR is designed to print QSL Cards using Mail Merge Tool in MS Word from ADIF file.

A pdf file with schematics of an ssb and cw filter AF amplifier

W3DZZ trapped multi-band antenna, exposed in this practical wireless article

Here is an easy method to mount elements to a boom, this can be realized at home, without the need of special tools

Diagram and sample ferrite balaun for 1.8-30 MHz

Generate QSL cards and labels in your own format. Donationware, windows program by Alpine software officially released for windows XP.

Projects and design atv de ik1hgi Progetti, circuits, master, fotos in Italian

HF and VHF amplifiers homebrewed by GM3WOJ

Complete CW CODE signs

Very compact and high efficiency antenna ,very low radiation angle even at low height.

This is a compact three transistor regenerative general coverage receiver with fixed feedback

This webpage describe how to set up the Signalink USB interface and Yaesu FT-857D for digital operations by NA4IT

G4PDQ's PacketCluster routines to make PacketCluster a little more interesting for the user and a little easier for the SysOp

English version of the Yaesu FT-7800 operating manual

Two Versions of 5 elements stacked 25 Ohm Yagis with 1,80 m and 2,00 m Boom

Amplifier keying buffer for ICOM radios & others. Suitable for IC-746 IC-756 PRO and PROII. ACC1 key interface by KK5DR

Homebrew antenna insulators for DK7ZB yagi antennas

1 watt amplifier for 10 ghz made from surplus stuff

On line qsl route and manager addresses by ik3qar

Contains digimodes, antenna projects, DX info and lots more

Working priciple of OSJ and jpole anntennas by PY4ZBZ

This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.

Wire beam antenna for the bands 6m, 10m, 12m, 15m, 17m and 20m

Computes the Standing Wave Ratio, given the power readings on a line.

VU3NSH article on high current universal supply for rigs

Supports both PSK31 and PSK63, sends and receives color thumbnail portraits by PSK63, displays 24 PSK63 channels simultaneously, and features semi-automatic mode selection between PSK63 and PSK31. Merely left-click on a PSK63 signal to copy, or right-click on a PSK31 signal to copy.

A GSM1800 Moxon Square antenna project is presented, detailing its construction using three 1.5mm copper wire pieces for the reflector and dipole elements. The design inherently offers a 50-ohm feedpoint impedance, allowing direct connection to 50-ohm coax without complex matching networks like baluns or gamma matches, which are prone to high attenuation at 1.8 GHz if not precisely built. The resource includes a construction plan, expected **SWR plots**, and **radiation patterns** for the GSM 1800 band, specifically covering the 1710-1785 MHz transmit (red zone) and 1805-1880 MHz receive (blue zone) segments. The SWR remains below 2:1 across the entire GSM 1800 band, with the main lobe consistently achieving 5-6 dBi gain. While the radiation pattern shows some changes across the band, these primarily affect the back of the antenna, maintaining consistent forward gain. Practical considerations for high-frequency operation are emphasized, such as minimizing coax length (e.g., under 1 meter for RG-174) and selecting appropriate connectors like N, SMA, or BNC to mitigate significant attenuation. The article also discusses direct connection to the phone's RF PCB for minimal loss and notes observed signal strength variations with antenna orientation despite crossed polarization at cell sites.

A VHF power amplifier made with two cheap RF transistors, 2N3924 as driver and a BFS22A for final stage, giving an unexpected output power of 7-8 watts maximum

by Adam M. Farson VA7OJ/AB4OJ

LZ2US offers 3 types amplifiers for the serious VHF/UHF amateur. These amplifiers are very robust and in use by contest groups and EME stations all over the world. Every amplifier is custom made.

10 GHz beacons list source internet , spots from DXCluster , hearing from 10GHz band by OK1JKT

OPCLOG provides a straightforward logging solution for amateur radio operators, enabling the systematic recording of contacts. The software primarily focuses on basic QSO management, allowing users to input essential contact details such as callsign, date, time, frequency, and mode. Its core utility lies in its ability to export log data in the _ADIF_ (Amateur Data Interchange Format) standard, which is crucial for interoperability with other ham radio applications and services. This ADIF export functionality facilitates the creation of personalized QSL cards, streamlining the process for operators who prefer custom designs over generic templates. The program's design emphasizes ease of use for individual station logging, rather than complex contest or DXpedition management. It offers a practical tool for maintaining a personal logbook, supporting the fundamental requirements for tracking contacts and preparing for awards. The software's simplicity ensures a low learning curve, making it accessible for operators focused on routine logging tasks.

A MRF141G 3-175MHz Broadband Power Amplifier DL4MEA 02/1998

An Hentenna plan for six meters band

QSL card printing tool for windows, can print complete back side of the QSL card and also labels

Versatile transmit interface circuit

A vertical dipole for the 40 meters band made by using some buddipole parts and adding capacities on both ends by HB9MTN

Club information, photos, utilities, links and repeater list. In Spanish

New type of a Quad antenna, 6.4dBd gain

Detailed review of all the Hell software currently available for the PC

By Guy, de ON6MU, At VHF, both the 1/4-wavelength monopole and the 5/8-wavelength monopole antennas are widely used.

Home made RF power amplifier for six meter band

A collection of extra Icons for the superb MixW programme.

Presents the amateur radio activities and interests of Kote, operating as 4L4KW. The page features a collection of external links relevant to the ham radio community, including references to other callsigns such as 4L1BR, 4L1W, 4L4MM, and 4L/ZL1RS, indicating potential connections or shared interests within the Georgian amateur radio scene. It also lists several well-known ham radio resources like QRZ.com, DXzone.com, and Contesting.com, suggesting an active engagement with DXing and contesting. The resource includes links to major amateur radio equipment manufacturers such as Icom, Yaesu, and Kenwood, which implies an interest in modern transceivers and station setup. The mention of DX-Summit and "fixed activity on Ham bands" further reinforces a focus on making contacts and participating in on-air operations. The page serves as a digital hub for 4L4KW's ham radio presence.

Information on licensing abroad for radio amatuers by OH2MCN, Veikko Komppa

High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match.

QSL print service online from poland with lots of printed card samples

glfer is a program for reception and transmission of QRSS/DFCW signals. It is composed of two main parts: the spectrogram window, where you can see the spectrum of the received signal vs. time the transmission functions, to emit cw characters at a slow but precisely controlled speed, using the QRSS (slow CW) or DFCW (Dual Frequency CW) modes