Search results

The DL4MEA Power Meter

Similar to Tiny 2 but this three element direct connect antenna utilizes a reflector and a director to achieve gain.

This FAQ is made from the archives of the FT100 mailing list based on the OneList service.

Maps and propagation indices

The Online Callbook for Internet Explorer makes it easy to find QSL information from the most popular HAM-radio web sites, such as QRZ.COM, ARRL.ORG, RAC.CA, QRZ.RU, BUCK.COM and OCTAVIA.COM,

Arab Amateur Radio orum. Transceivers , Antennas, Educational, Software, Digital Communication and more.

EchoMac is a client program for OS X that allows connection to the Echolink system

Demonstrates a practical online tool for locating amateur radio operators by geographic area, specifically using US ZIP codes. This utility allows users to input at least three digits of a desired ZIP code to retrieve a list of active licensees. Search results can be sorted by _call sign_, name, license expiration date, or ZIP code, providing flexibility in data organization. The service offers two primary output formats: direct display in a web browser, which omits address details for privacy, or export to a tab-delimited file, which includes full address information suitable for import into spreadsheet or database applications like _Excel_. This lookup service proves useful for local club organizers seeking to identify potential members within their service area or for hams planning local nets or events. The ability to export data with address details facilitates direct mailings for club newsletters or event announcements, while the browser view maintains privacy for casual lookups. The tool's design prioritizes ease of use, requiring minimal input to generate relevant local amateur radio contact information.

Information on equipment manufactured by the Bird Electronic Corporation, wattmeters, RF loads, switches by I0JX

Presents a QRP AM/CW transmitter project specifically designed for the 10-meter band, utilizing a crystal oscillator and a collector-modulated AM oscillator. The design employs a 2N2219(A) transistor in a Colpitts configuration, generating 100 to 350 mW of RF output power depending on the 9-18 Volt supply voltage and modulation depth. Frequency stability is maintained by a 28 MHz crystal, with fine-tuning possible via a Ct1 trimmer capacitor for approximately 1 kHz adjustment. The resource details the RF oscillator stage, implemented with a 2N2219 NPN transistor, emphasizing frequency stability and low power dissipation. It also covers the amplitude modulation stage, managed by a 2N2905 PNP transistor, which impresses audio information onto the carrier. Selective components (C3, C4, C7, C5) enhance voice frequencies within a +/- 5 kHz bandwidth, and modulation depth is controlled by R2 and R3. The project includes a 3-element L-type narrow bandpass filter (Ct3, L3, C10) to suppress harmonics and ensure a clean output signal. The project provides a complete schematic diagram, a comprehensive parts list including specific capacitor, resistor, and inductor values, and construction notes for the coils (L1, L2, L3). It also offers practical advice on enclosure requirements, suggesting an all-metal case or a PVC box with graphite paint for RF shielding. Operational parameters such as current draw (27mA@9V to 45mA@16V) and input impedance (50 Ohms) are specified, alongside guidance on antenna matching and the importance of a valid amateur radio license for 10-meter band operation.

QRG_DB is a database for the Palm OS computer to control a Yaesu FT-817 Transceiver via the CAT interface

conversion of low band VHF AWA 25M-1 carphone onto 6 metres.

A switchable Magnetic Transformer for Transmitting for various impedances

Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.

The _Italian VHF Beacons_ resource provides a detailed listing of active and QRT amateur radio beacons operating across VHF, UHF, and SHF bands within Italy. Each entry specifies the beacon's callsign (e.g., IQ1SP/B), operating frequency (e.g., 144.411 MHz), QTH locator (e.g., JN44VC), effective radiated power (ERP) in watts, and antenna configuration (e.g., Big Wheel, 4x Dipole, Yagi). This data is crucial for radio amateurs involved in propagation studies, equipment testing, and long-distance (DX) communication on these higher frequency bands, offering fixed signal sources for monitoring. This compilation, last updated in October 2005, serves as a historical snapshot of Italian beacon activity. For instance, it lists several 144 MHz beacons with ERPs ranging from **0.1W** to **10W**, and higher frequency beacons such as I8EMG/B on 1296.880 MHz and I3EME/B on 24192.132 MHz. The inclusion of QRT (Quiet Radio Teletype) status for many entries indicates the dynamic nature of beacon operations over time. Users can utilize this information to identify potential signal sources for band openings or to calibrate their receiving equipment against known transmissions.

Eham users reviews for Yaesu VX-150

Pittsburgh's largest ham radio site.

club station VK2MB, Manly Warringah Radios Society, on northern beaches of Sydney, Australia.

This is Wimpey site,a full featured Ham Radio,CB,short wave police scanner and much more ARS KA4PNV

Notes and details on repairing Traps on Cushcraft A3S

Triband DK7ZB VHF Yagi antenna for 6 m, 4 m and 2 m with a single feedpoint

Homepage of the vero beach amateur radio club, w4ot

Belgian question pool by on1dht

This program intended for electronic circuit analysis (mainly for Linux). ViPEC is a powerful tool for the analysis of high frequency, linear electrical networks.

Frequency coverage: 3.75 MHz to 4.00 MH transceiver for 75 MHz band

Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem

Primary QSL Managers by NW3K

A Yaesu rotator controller made with an arduino

Meter capable of accurately measuring low levels of RF power

In response to a question about Numbers Stations, their origin and purpose, the following information should be of interest.

HB9MTN loop motor control software. For motor control, either Centronics, RS232 or USB ports can be used, for CAT-Control the RS232 or USB ports.

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

Honduran amateur radio club founded in 1958 in San Pedro Sula, Cortes.

Ten-Ten International QSO parties logging program multi plaform run with Java under Windowd Linux MacOSX

Operating an 80/40/20M fan dipole for DX is analyzed through EZNEC modeling, focusing on the antenna's performance in a real-world, low-height installation. The resource details the physical construction and SWR measurements of the fan dipole, comparing them against EZNEC simulations. It also incorporates High Frequency Terrain Analysis (HFTA) data to illustrate typical DX elevation angles for various regions from New England, providing a crucial context for evaluating antenna patterns. The analysis presents EZNEC-generated azimuth and elevation patterns for each band (80M, 40M, 20M) at specific frequencies, showing gain figures at different elevation angles relevant to DX propagation. It compares the modeled SWR with measured SWR, attributing discrepancies to coax attenuation. The study concludes with observations on the antenna's azimuth performance (omnidirectional within ±1.5 dB) and its less optimal elevation gain at desired DX angles, highlighting the impact of low antenna height on DX capabilities.

VE2ZAZ and distorted audio in SSB on some models prior 2006

Florida DXers meet every other month in Ft. Lauderdale to discuss DX, antennas and such. We host the DX forum at the Tropical Hamboree in Miami the first Saturday in Feb.

A free radio station that is transmitting world wide on several shortwave frequency 's with loads of pirate and freeradio information.

To build a Band Decoder to drive our remote relays, we need to supply the band information from the rig to the decoder

Resistor Finder is a program that allows the electronics designer or hobbyist to find a combination of 2 resistors that, when connected in parallel, will provide the best match to a desired resistance.

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

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

Eham users review of the Yaesu FT-950

French CW radio club

PSK Express is a replacement for YGPSK, it is multi-mode and will allow you to use PSK, RTTY or MFSK at various speeds. Requires .Net framework and run under windows, freeware.

A graphical add-on package to monitor seti@home activity that may be running on multiple computers over a network or multiple instances on the same computer. Runs on Windows or Linux.

Demonstrates how to construct an automatic band decoder, moving beyond manual selector switches for antenna and filter control. It addresses the challenge of varying band data outputs from different transceivers: Icom rigs provide voltage values, Yaesu rigs use Binary Coded Decimal (BCD), and Kenwood rigs lack direct band data output. The resource highlights a clever solution utilizing logging software like _CT (K1EA)_ and _DX4WIN_ to emulate Yaesu's BCD output via a PC's printer port, making the decoder compatible with any rig. The author details experiences building decoders based on designs by Bob _K6XX_ and Guy _ON4AOI_, noting K6XX's simple TTL chip design and ON4AOI's more comprehensive, opto-isolated unit capable of controlling ten outputs and bandpass filters like the _Dunestar_. It also references a _W9XT_ board design, which Steve Wilson, G3VMW, modified with BD140 transistors for source drivers, emphasizing safety. The author successfully cased an ON4AOI-based decoder in an old modem case, connecting it to an FT1000MP or a PC printer port to drive remote relays and a Dunestar Band Pass Filter.

The FCC Lookup System software uses the standard FCC data files in an advanced lookup system for matching a call sign to a user. The software creates index files to allow rapid searches without modifying the FCC data file. Available for both Windows and Linux.

Hamlib is a library aid for software developers wishing to incorporate control of amateur radio hardware into their programs. Hamlib will allow ham radio software authors to concentrate on the user interface and the basic function of the program rather than radio control.

All about Chilean contest, awards, links and general news and DX from Chile