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Supplier of radio based kits to the electronics hobbist

Yaesu FT-2000 Panadapter, using the Softrock 9 Lite, SDR receiver kit

QRP kits for Radio Amateurs

Sherwood Engineering Inc., based in Denver, Colorado, specializes in ham radio accessories and components. The company, located at 1268 South Ogden Street, offers a variety of products including filters, cooling kits, and audio switch boxes. Sherwood Engineering is known for its work with brands such as _Drake_, _Icom_, and Collins, providing components like 455 kHz mechanical and crystal filters. The company has also been involved in producing first-IF roofing filters and DSP protection filters. Sherwood Engineering has a history of over 45 years in the industry, though it has now retired from producing certain products like the SE-3 MK IV. Despite this, the company continues to provide technical resources and presentations on optimizing rig performance, with past events held at venues like the Dayton Contest University in 2014. The company operates Monday through Friday, from 9 a.m. to 5 p.m. Mountain Time, and accepts payments via PayPal, check, or money order. DXZone Focus: Denver | Filters | Icom

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

A rebuild job on a Heathkit SB-200 amplifier by N4NAB

This article by Seabury Lyon, AA1MY describe how homebrew kits for amateur radio pourposes, in order to support wire antennas

Heathkit Amateur Radio Repair, parts, and manuals. Amateur radio equipment sales and service.

Digital Signal Processor Kits

1500 watts PEP output from a Kenwood TL-922 amplifier requires careful attention to parasitic suppression and component selection to ensure stability and longevity. This resource critically examines common modifications, often based on anecdotal evidence rather than sound engineering principles, that can degrade performance or introduce new issues. It highlights how replacing aged components often gets misattributed to the efficacy of unnecessary modifications, leading to widespread misinformation within the amateur radio community regarding amplifier stability. The article details specific, effective modifications for the TL-922, such as shortening anode-to-chassis and anode-to-grid paths to improve VHF stability and efficiency. It addresses issues like incorrect capacitor types in the tank circuit, inadequate grid grounding, and poor RF sheet metal design, providing practical solutions like adding direct ground connections for the plate tune variable capacitor. The author also discusses proper parasitic suppressor design, emphasizing the importance of lead length and component selection for optimal performance and harmonic suppression, contrasting these with less effective or detrimental 'magical suppression kits'.

IV3GFN modification and restore of an HeathkitSB220

Fabricates baseplate components, and provides hardware kits for DIY hex beam, spiderbeam and moxon antennas.

Heathkit Icom Kenwood Power Transistors Ten Tec Yaesu spare Hamradio parts.

5000+ member discussion group for the low-cost series of SoftRock SDR receiver and transceiver kits.

Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter

Heathkit Manuals

Heathkit SB-220 Amplifier modification by KE5YA

Article about assembling of a Dick Smith Electronics (DSE) 100 Watt VHF Linear Amplifier kit.

Boom Microphone Headsets for use on amateur transceivers- assembled and kit form.

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

Third-order Cauer filters can boost performance of multi-transmitter, multi-operator contest stations to the next level. The filters are practical and you don’t need expensive test equipment to align them.

Pioneer supplier in the radio parts field, and electronic components, alternative power products, kits, test equipment and computer components.

EB5AGV / EC5AAU Boatanchor collection. Useful data on TV-testers, Collins, Drake, Hammarlund, Hallicrafters, National, Heathkit, EF Johnson.

A workbench instrument capable of testing transistors, diodes, FETs, usefull constructing QRP circuitry.

W5UXH version of OZ1JHM Morse Code decoder project

Eham user's review on the Heathkit SB-200 HF amp

Australia's largest range of Electronic Kits & Components In Stock for the Radio Experimenter, ATV, microwaves, HF Band pass filters

Building the MFJ Cub QRP transceiver kit for 20 meters band by G4ILO

A led electroluminescent radio receiver

Manufacturer of fiberglass parts for kites

Portuguese Antenna dealer, offer also HF Converter Kit for the SDR Fun Cube Dongle and RTL SDR sticks

Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists. Capacitos, filters, inductors, qrp products

Ham Radio Antenna parts and kits manufacturer, based in Germany

Restoration of Viking Valiant, Hammarlund SP-600 and Heathkit HX-10 Marauder by KG9OM and KJ4W

Solar Panels, Grid Tie Systems, Solar Power Kits, Solar Cells and more. DMsolar carries solar energy products for your needs.

The following are the opinions expressed by various amateurs.

USA

Speaker repair, reconing, re-edging, speaker parts, DIY re-edge kits.

Accessories, Antennas and Battery chargers. Radiators, Repeaters, Yagi, Mag, Car, Tetra, Marine, Multiband, Brackets, Mounting accessories, cables and connectors, radiokits, special cables etc. Based in Finland

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

Promoting Amateur Radio in Kitsap County Washington

Magnetic Loop antenna for 20 to 80 meters band using home made butterfly condensator kit

Clean Up Your Signals with Band-Pass Filters

Cushcraft A3S performances with the A743 kit to add 30 and 40 meters

HobbyPCB.com provides quality products and boards for amateur radio including the popular HARDROCK 50 amplifier

CW Beacon kit by Expanded Spectrum Systems

Banana plugs, coaxial cable assemblies, patch cords, oscilloscope and DMM test lead and probe kits and accessories, IC test clips, boxes, RF connectors, XLR and 75-ohm cable assembly products.

KN-Q10 Assembly Manual four band (3.5, 7, 14 & 21MHz) 5W SSB/CW transceiver kit Translated by BD6CR/4,

Constructing a high-power 70cm solid-state amplifier presents unique challenges, particularly when aiming for 500 watts output using modern LDMOS devices. This resource details the author's experience building a 70cm amplifier based on a _Freescale MRFE6VP5600H_ transistor, initially from an RFHAM kit. It meticulously outlines the necessary modifications to achieve advertised performance, including optimizing input and output matching, correcting bias circuitry, and ensuring proper output balun connections for stability. The author shares specific adjustments, such as trimming the prototyping board for better transistor fit, drilling additional mounting holes for improved heat sinking, and replacing original matching capacitors with a single _20pf MIN02 metal mica_ for superior output. A critical fix involved jumpering gate decoupling pads to balance the push-pull transistor halves, which increased output to 580W and improved IMD. The resource also highlights a crucial correction to the output balun connection, initially reversed in the _Dubus_ article schematic, which resolved intermittent stability issues. Test results are provided, showing input power, output power, and drain current at 50V, demonstrating the amplifier's performance after modifications. This practical account offers valuable insights for hams undertaking similar high-power UHF amplifier projects, especially those working with LDMOS devices and kit-based constructions.

ozQRP offer a range of kits to build a complete QRP SSB transceiver