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G8EPR pye telecoms museum incorporating.. emeregency services & radiotelephone museum of great britain

Constructing a high-performance RF spectrum analyzer up to 1000 MHz requires careful attention to component selection, shielding, and circuit isolation. This resource details a project that improves upon the _Spectrum Analyzer for the Radio Amateur_ design by Wes Hayward (W7ZOI) and Terry White (K7TAU), incorporating ideas from Scotty Sprowls' project, particularly his 1013.3 MHz IF bandpass cavity filter. The analyzer utilizes a Mini-Circuits SRA-11 mixer with a sweeping local oscillator from 1013 to 2013 MHz, feeding into a 4-pole copper pipe cavity filter. The design employs a second SRA-11 mixer with a fixed 1024 MHz LO to produce a 10.7 MHz final IF. This signal then passes through narrowband resolution filters and is processed by Analog Devices AD603 and AD8307 ICs for IF amplification and logarithmic detection, driving an oscilloscope in X/Y mode. The project emphasizes modular construction, using salvaged components and double-sided FR4 material for PCBs, with critical notes on minimizing spurious images through effective shielding and proper voltage regulation for each module. Key components include a Z-Communications V585ME48 VCO for the first LO and a Z-Comm V583ME01 VCO controlled by a Motorola MC145151 PLL for the second LO. An optional Hittite HMC307 step attenuator and K&L 5L121-1000/T5000-O/O low-pass filter manage RF input. Tuning procedures for the 10.7 MHz IF resolution filter are also detailed, showing before-and-after spectrum views.

This versatile broadband amplifier is used in several DX Lab projects.

Next Generation Beacon hardware platform encompasses both analog and digital modes, i.e. CW FSK and MGM in a mixed mode configuration. The advantage of the mixed mode is that humans can decode the CW FSK by ear and the MGM can be decoded by computers way below what is audible. Therefore the MGM can be used for pre-human-conditions or early warning monitoring.

Contest station from Donetsk, UKRAINE

Located near North Bay Ontario (FN06) about 300KM north of Toronto, the CCC is built on the property of VA3RTW (Bob Williams).

The home page of WSJT-X Improved, an enhanced version of WSJT-X, the popular tool for hams interested in digital modes such as FT8 and JT65. The software provides enhancements and improvements to the original WSJT-X program, making it easier and more efficient for ham operators to communicate digitally. Whether you are a beginner or an experienced operator, this download can help enhance your digital communications capabilities. Free downlaod and full description of improved features.

Licensed since February 1991, IK1QBT Tony Gallo shares insights into his extensive amateur radio journey, highlighting his involvement in **DXpeditioning** and contesting. His page lists several callsigns he has operated under, including 3A/IK1QBT, TK/IK1QBT, IA5/IK1QBT, and as an operator for 4U9ITU and 4U0ITU, showcasing a broad range of international activity. Tony's background as an ex-Radio Officer in the Merchant Navy and a Radio Operator for the Italian Maritime Coast Radio Station "ICB/GenoaRadio" provides a unique perspective on radio communications. He is an active member of ARI, INORC, and HSC, and serves as secretary for the Marconi Club ARI LOANO, underscoring his deep engagement within the amateur radio community. His participation in multi-multi operator contest teams like IH9P in the CQWW-CW 2006 and the HQ Italian ARI Contest Team in the IARU HF (2004-05-06) demonstrates a strong commitment to competitive operating, primarily on **CW** and HF bands.

AM and vintage radio forum

Poole Radio Society G4PRS, located in Poole, Dorset.

Home of Bosnia and Herzegovina Contest Operators

Eden Valley RS, G0ANT Meets on last Thursday of the month at the Merlin Club Penrith

Amateur Radio reviews and software setups. Page contains software reviews for a number of Amateur radio software packages, services, and hardware reviews. Setups for various software, contests, hardware, and contest setups.

Reviews of the Yaesu FL-2100 series power amplifier at eham

A schematic diagram of a homemade direct conversion receiver for 30 meters band

Rewinding solenoid coils and how to article

Notes on Birds wattmeter slugs

The 6 Shooter Net is a informal rag chew, swap net, and tech question net held on Sunday nights on 147.570 simplex in the Dallas/Fort Worth metroplex. See our website, www.6shooter.net for more information!

The Hidden Valleys Amateur Radio Club is a small friendly club located in the hills and valleys of Southwestern Wisconsin.

Articles and review on the Yaesu FT 817 by OZ9AEC

WA8MCQ modification for the Heathkit HW-7 transceiver

technics, radio astronomy, great links, duplex filter

Collection of Telegraph Keys & related items

YI official web site

Keys from around the World

Two receivers compared, Drake R8A and Palstar R30

Eham users product review about the Yaesu VX-170 waterproof vhf ht transceiver

50 Ohm Coax Antenna Power Splitter and Matching Network

Using Spectrum Lab for the reception of VLF natural radio

W6OPO report on Icom IC-7700 stress test to verify PA integrity under high duty-cycle usage

Serving Henry,Knox,Stark,Rock Island, Mercer, Lee, Warren,Peoria,Bureau,Tazewell,Woodford,Marshall, Fulton, counties in Illinois and Scott county in Iowa.

VHF beacon Located in JN58ic

The Islands Of Croatia Award

5H/ZS6GH C91/ZS6GH / 3DA1GH

Christians of Idaho Amateur Radio Club, Inc.

CEMARC is ARRL Affiliated Council of Clubs representing the Ham Radio Community in Eastern Massachusetts.

High Performance Communications Receiver AKA, The Progressive Receiver

SEAARCis located in Medicine Hat, Alberta

50,006.0 MHz from LL55SH by Qatar Amateur Radio Society

Founded in 1959

Designing and constructing a two-element receiving loop antenna array for HF operation involves specific considerations for achieving high directivity and noise reduction. This resource details a homebrew system comprising two 30-inch diamond-shaped loops, spaced 20 feet apart, which are fed through mast-mounted preamplifiers and passive signal combiners. The operational principle relies on adjusting phase delays between elements via precise _Belden 8241_ coaxial cable lengths, optimized for specific bands from 160m to 20m. Performance data, derived from _EZ-NEC_ modeling, illustrates consistent 90° azimuth-plane beamwidth and low take-off angles across the target bands, with _Receiving Directivity Factor_ (RDF) values comparable to a 300-foot Beverage antenna. The article presents detailed elevation and azimuth plots for 20m, 30m, 40m, 80m, and 160m, demonstrating the array's ability to provide strong response at low DX angles while also supporting _NVIS_ signals. Key components like the _DX Engineering RPA-1_ preamplifier and _DXE RSC-2_ signal combiner are discussed, alongside the importance of impedance matching to preserve antenna patterns. The construction emphasizes self-contained elements that do not require ground radials, offering a compact solution suitable for suburban environments and stealth installations, with a focus on optimizing receive performance independently from transmit antennas.

eHam reviews for the Kenwood TM 241 VHF mobile transceiver

QRP Operations by RV3APM

I5JVA Carlo Home Page

NFM (for Noise Figure Meter) is a software application to assist Noise Figure measurement. NFM implements the method of Agilent application notes AN 57-1 and AN 57-2 for noise figure measurement, but with the addition of an adjustable attenuator after the noise source and between the DUT and instrument.

Traveling Wave Tubes , Conventional Traveling Wave Tubes, Microwave Power Modules manufacturer