Links

A list of resources I've found useful (Each link opens in a new tab)

Updated 2024-09-23

My other pages

• QRZ
• YouTube

Videos about Amateur Radio

• This is Ham Radio - 1970 American Radio Relay League promotional film Amateur Radio 10544
• A History of Amateur Radio - By Robert (Cyril) Grundulis EI2HNB

WayBackMachine

• WayBackMachine - Internet Archive

Toroids

• Toroid winding calculator - Toroids.info
• Toroid winding calculator - 66Pacific
• Buy Toroids - W8DIZ "The Toroid King"
• Maximum turns (toroid size vs. wire AWG size)
• #43 Fair-Rite Toroids - (From Mouser)

w7zoi Technical Pages

• Old Technology and Methods: - Files from the W7ZOI page

GQRP Technical Pages

• GQRP Technical Pages - By GQRP Club
• GQRP Technical Pages 2 - A Short Guide to W3NQN Harmonic Filters for QRP Transmitter Output. - George Dobbs G3RJV
• GQRP Low Pass Filters Sheet - Download in PDF format

TIA amp with AGC

• Termination Insensitive Amplifier with AGC: Time to Upgrade your BiTx? - YouTube by Paul (VK3HN)
• Adding AGC to a Termination Insensitive Amplifier - Paper by Wes Hayward, w7zoi August 29, 2021, update Oct 27, 2021
• #337: Use a NanoVNA to measure input impedance and gain of a small-signal RF (TIA) amplifier - YouTube by W2AEW

Radio Receiver Theory

• AM Radio Tutorial - A tutorial on the principles of AM radio receiver design By ELECTRONICS-TUTORIALS.COM
• AM Radio Series - By The Offset Volt
• FM Radio Series - By The Offset Volt

Build an FM band (96MHz) audio transmitter

• 96MHZ FM TX - by Joy Mukherji

Build an RF Linear power amp

Kit Builds

• G0MGX builds the Hans Summers 10W SSB Linear Amplifier kit (YouTube): Pt.1 - Pt.2 - Pt.3 - Pt.4 - QRP Labs kit source
• NA5Y builds an Amazon 45W SSB Linear Amplifier kit (YouTube): Pt.1 - Pt.2 - Notes (PDF file) - Schematic
• SB-220 "New-Old-Stock" Unassembled Heathkit kit Build - By Mr. BBI: Pt.1 - Pt.2 - Pt.3 - Pt.4 - Pt.5

Very low power designs (e.g. 500mW - 5W)

• QRP (500mW) HF linear amplifier using 2N2222's - by Harry Lythall (SM0VPO)
• Also see: Basic Linear Amplifier Design Tutorial - by Harry Lythall (SM0VPO)

• JBOT (Just a Bunch Of Transistors) - An Easy QRP linear amplifier - By Ashhar Farhan (VU2ESE)

RD16HHF1 RF MOSFET designs

• Build of EI9GQ 16W Dual RD16HHF1 Amp (website) - (YouTube) - By KK4DAS

IRF510 switching MOSFET and other low cost switching MOSFET designs (Switching MOSFET designs have limited performance above 20 Meters; i.e. 14.350 MHz)

• Broadband 40W HF Amp Using Low-Cost Power MOSFETs Pt. 1 - Pt. 2 - By WA2EBY
• All mode 22W HF RF Power Amp with PI network impedance matching - By ON6MU
• 300w RF Amplifier using low cost IRF150 MOSFETs at 36V - By Eliza Sukiman (YB0BAJ) (250w @1.8 MHz) (300w at 3.5 MHz) (200w at 7 MHz)
• 300w RF Amplifier using low cost IRF450 MOSFETs - By Eliza Sukiman (YB0BAJ)

MRF101 LDMOS designs (True RF transistors)

• MRF101 source - Mouser
• MRF101 source - Arrow
• MRF101 source - Newark

• HF Power-Amplifier MRF101 - YouTube by Stefan Meyre (HB9GZE)
• Minimalist 100 Watt Class C 1.8-54 MHz RF Deck - NXP Homebrew RF Design Challenge entry
• 100 Watt PA using MRF100 LDMOS - NXP Homebrew RF Design Challenge winner (WA2EUJ) - Site - (BOM) - (Schematic Ver A) - (Ver B)
• 100W HF amplifier with MRF101 LDMOS - Another build of the above (By HF5L Radio Club) -
• 150W HF amplifier with push-pull MRF101 - By AD5GH
• RF Power Amplifier Construction - by Ron Taylor

MRF300 LDMOS designs (True RF transistors)

• MRF300 source - Mouser
• MRF300 source - Arrow
• MRF300 source - Newark

• NXP MRF300 Homebrew RF Design Challenge - YouTube from Jacques Depijpere (ON7NP)
• HF Broadband Amplifier with two MRF300 LDMOS (translated) - Roberto Vannucci (IK6BLO)
• HF Broadband Amplifier with two MRF300 LDMOS - Roberto Vannucci (IK6BLO)
• Power amplifier broadband hf with two LDMOS MRF 300 - YouTube By Roberto Vannucci (See YouTube's CC to auto translate)
• Single MRF300 Driver Amp - YouTube by VictorR3KR
• MRF300 Specifications - YouTube
• MRF300 Specifications - YouTube from from Mouser

DIY LiFePO4 Battery Pack

• DIY LiFePO4 Battery - Pocket Portable - By OH8STN

Parts Suppliers

• Chip Mall - Electronic Components
• LCSC - Electronic Components
• AliExpress -
• Utsource - Hard to find and discontinued Parts
• Quest Components - Electronic Components
• Electronix Express - Electronic components and equipment

• RS - Formerly Known as Allied

• MPJA - Ten Turn Potentiometers

• McMASTER-CARR - Hardware, tools, raw materials, industrial materials and maintenance equipment

• Antique Electronic Supply - Parts to build, repair, and maintain vintage audio equipment

• AmplifiedParts - Mica Capacitors (Free Shipping for orders of over $89.00)
• AmplifiedParts - Fahnestock Clips (Free Shipping for orders of over $89.00)
• West Florida Components - Mica Capacitors
• Tayda Electronics -
• Mouser - Electronic parts
• Digi-Key - Electronic parts
• Jameco - Electronic parts
• Newark - Electronic parts
• NAC Semi (NAC Group, Inc.) - RF Related Electronic Parts
• RichardsonRFPD - RF Related Electronic Parts
• RFMW - Specializing in Distribution of RF and Microwave Components
• JPM Supply - RF Related Electronic Parts - Houston, TX

• ICA Manufacturing - Home page - Linear Amplifer parts
• ICA Manufacturing - Linear Amplifer Cabinets
• CCI - Communication Concepts, Inc Home page - PA kits and parts
• CCI - EB63A 140W HF Amplifier Kit

• Batteries - Battery Junction.com
• Toroids - W8DIZ "The Toroid King"
• Georgia Copper - Copper strap, copper braid, copper wire, clamps, ground bars, and more
• Dan's small parts and kits - Hard to find RF parts at unbelievable prices
• Tin Plate 0.013" Steel Sheet - Source for tin platted steel sheet 0.013" x 6" x 12"
• RF Parts Company - High quality genuine RF parts
• Radio.Parts - Radio Replacement Parts by Actual Mfgr Part Number
• Surplus Sales of Nebraska - Where the hard to find parts are found
• Mike's Electronic Parts - Hard to find electronic parts; e.g. Litz wire, Air variable and Polyvaricon capacitors, et cetera

• Spectrum Communications - ebay store
• Harbach - Source For Amateur Radio Amplifier Parts & Upgrade Kits

• Futurlec - Electronic components superstore
• PMD Way - Prototyping supplies for Arduino
• Electronic Goldmine - Hard to find and discount electronic components

Ameritron ALS-500M HF Solid State Amplifier info

• AMERITRON ALS 500M User Manual - From UserManual.wiki
• Ameritron ALS-500M - GigaParts
• Ameritron ALS-500M Review - By Moleculo
• Inside Ameritron ALS 500M - YouTube by W6WUH
• Ameritron ALS-500M inside chassis review - YouTube by Bells CB

Service Manuals Online

• Search For Manuals Online - Manuals lib

High current linear DC power supplies and transformers

• AnTek - AnTek is located in North Arlington, New Jersey

Diplexer

• The Diplexer - A tale of IMD - A most Diplexing Mystery - The Radio Shack by Mark G0MGX
• Diplexer: What, why & how? - YouTube by Paul (VK3HN)
• Diplexer Calculator (Bridged Tee) - By: Changpuak

Two Tone Testing of SSB transmitter

• Testing Audio Amplifiers using PC based o-scope and sig gen via sound card - DuWayne's Place
• #8: Two-tone test of SSB transmitter output - By w2aew
• Building a simple 2 tone audio generator for testing SSB radios - by MikesRadioRepair

Spectrum Analyzer and VNA related

• tinySA ULTRA - 100kHz-5.3GHz Spectrum Analyzer 4" Touchscreen - Official Information Site
• Safe places to buy the tinySA Ultra - R&L Electronics
• Safe places to buy the tinySA Ultra - AliExpress (Zeenko Store - Official Factory Store)

• Original tinySA: $10,000 in capability for under $60 - YouTube by Vienna Wireless Society

• Duplexer Tuning - Around the Homestead with Sue & Ryan
• Using an SDRPlay as a Spectrum Analyzer - by Mark G0MGX

• #276: Smith Chart: Design an L-Network - Impedance Matching Circuit - YouTube by W2AEW
• #337: Use a NanoVNA to measure input impedance and gain of a small-signal RF (TIA) amplifier - YouTube by W2AEW
• #326: How to Measure the impedance of "unknown" coax using a NanoVNA - YouTube by W2AEW
• #319: Measuring Crystals with NanoVNA and other tools - YouTube by W2AEW
• #317: NanoVNA Port Extension using the Electrical Delay setting - YouTube by W2AEW

• #359 How to use a NanoVNA V2 and Smith Chart (Tutorial) - YouTube by Andreas Spiess
• #480 NANOVNA Made Simple - YouTube by IMSAI Guy
• #502 NANOVNA Demystified - YouTube by IMSAI Guy

Standard and QER (Quasi-Eqi-Ripple) Crystal Filter info

• QER (Quasi-Equi-Ripple) crystal filter topology - By VK2SJA
• QER Crystal Filter Designer - W3JDR
• G3UUR's "QER" crystal filter - From QRZ.COM
• DIY transceiver: Crystal ladder filter - Stefan Meyre, HB9GZE
• Crystal ladder filter calculator - From Giangrandi.ch
• Crystal characterization and crystal filter design - An overview of tools and techniques Nick Kennedy, WA5BDUJoplin, MO April 26, 2008
• G3JIR's crystal filter design method from the 1980's - From by Lloyd Butler VK5BR (Originally Published in Amateur Radio March 1990)
• G3JIR's crystal filter design method from the 1980's - From Radio-bekas blog

Clubs and on Air Nets

• CCARC (K3PZN) - Carroll County Amateur Radio Club, Inc. (145.410 MHz PL:114.8) (449.875 MHz PL:127.3)
• PennMar (W3MUM) - PennMar Radio Club, Inc. (147.330 MHz PL:123.0) (Simplex 147.495 MHz)
• Vienna Wireless Society - (WVS) - Vienna VA and the greater Washington DC metropolitan area
• The 7235 Friendly Net - A Friendly Group of Hams Operating on 7235 KHz 7 days a week from 0700-0800 Eastern Time

Map tools - Daylight, Lighting, World Time and Ham finder Maps

• Daylight Map
• Daylight Map
• Daylight Map
• Time Zone Map
• Lighting Map
• Amateur Radio License Map - Use this map to find amateur radio license holders in the USA
• Aircraft Flight Tracking Map - ADS-B Exchange - Flight monitoring using unfiltered ADS-B/Mode S/MLAT feeds
• Area calculator - Find the area of a shape you draw on a google map

FCC License Information / GMRS General Mobile Radio Service

• How to renew your Amateur Radio license - Instructions from the FCC site
• FCC License Search - Find your FRN number
• FCC License Manager - Log in to the License Manager to view and manage your licenses and applications, apply for a new license, and perform other license and application management tasks based on your FCC Registration Number (FRN)
• GMRS Station license - General Mobile Radio Service (GMRS) Filing Instructions

Space Weather and Propagation

• Radio Communications Dashboard - NOAA Space Weather Prediction Center
• Solar Propagation Conditions - By RigReference
• Sunspot Cycle - National Oceanic and Atmospheric Administration
• D Region Absorption Predictions (D-RAP) - Space Weather Prediction Center National Oceanic and Atmospheric Administration

• Propagation Primer 101 - by Paul Harden - NA5N Updated 01 July 1999
• Space Weather Prediction Center - National Oceanic and Atmospheric Administration

• Solar Ham - by VE3EN
• Digimode Automatic Propagation Reporter

SDR TDOA Direction Finder

• SDR TDOA Direction Finder - Instructions of using the KiwiSDR direction finder By RTL-SDR.COM

Shortwave Schedule

• Shortwave Schedule - By Short-wave.info
• Shortwave Schedule - By ShortwaveSchedule.com

SDR On-Line Remote Receivers

• KiwiSDR WEB-SDR - Worldwide map index
• Signal-to-noise ratio based scores - KiwiSDR WEB-SDR

• World map of Receivers and Transmitters (includes VHF and UHF)
• NA5B WebSDR VHF Reciver System Washington DC Area SDR

Westminster, Maryland U.S.A. ([D] Antenna: 500 foot Beverage antenna aimed to Europe)

Westminster, Maryland U.S.A. ([E] Antenna: 900 foot Horizontal Sky Loop)

• 7.163 MHz - W3HFU Westminster, Maryland U.S.A.
• 7.156 MHz - W3HFU Westminster, Maryland U.S.A.
• 7.242 MHz - W3HFU Westminster, Maryland U.S.A.
• 7.235 MHZ - W3HFU Westminster, Maryland U.S.A.
• 1.970 MHz - W3HFU Westminster, Maryland U.S.A.

• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (A) Antenna: 120 ft T2FD*
• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (B) Antenna: 250 ft V Beam Antenna aimed to Europe
• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (C) Antenna: 58 ft T2FD*
• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (D) Antenna: 500 foot Beverage antenna aimed to Europe
• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (E) Antenna: 900 foot Horizontal Sky Loop
• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (F) Antenna: 400 ft un-terminated South Beverage
• KiwiSDR WEB-SDR W3HFU Westminster, Maryland U.S.A. (G) Antenna: 11/10 meter dipole

• KiwiSDR WEB-SDR K1VL Mountaintop Radio - Central Vermont - Antenna: 270ft center fed doublet @ 65ft
• KiwiSDR WEB-SDR WA2ZKD/1 Rockport, Maine U.S.A.
• KiwiSDR WEB-SDR W1NT Newton, New Hampshire U.S.A.
• KiwiSDR WEB-SDR W1HB Arlington, Virginia USA

• KiwiSDR: Software-defined receiver at KB6C/6 Southern California

Canada

• KiwiSDR WEB-SDR Club VE2CWQ St-Michel-des-Saints, Québec, Canada - Antenna: Carolina Windom 10-160m
• KiwiSDR WEB-SDR VE3HOA Ottawa Canada - Antenna: 160 meter Beverage

Australia

• KiwiSDR: Ironstone Range 1, South Australia - Antenna: 10m Duoconical Monopole Antenna
• KiwiSDR #4: VK3KHZ Croydon, Victoria, Australia - Antenna: T2FD 25m long for 3-30MHz & Marconi-T 13m high for 0-3MHz

• WWV Time - 20.000MHz
• WWV Time - 15.000MHz
• WWV Time - 10.000MHz
• WWV Time - 5.000MHz
• WWV Time - 2.500MHz

• SDR Link Index - From Ham Radio Secrets website

• NA5B WebSDR receiver in Washington DC

• *T2FD Antenna - Terminated, Tilted, Folded Dipole

Homebrew Rigs, projects and Blogs by others

• 7L4WVU Homemade radio - Astonishingly small homebrew by Tadashi Haraguchi
• 6 meter (50 MHz) transceiver homebrew - By Chrix

• Pauls Radio Hacks (M0EME) - A very professional build of a homebrew BITX transceiver
• John Hawkes - M0XFX
• N6QW's PSSST-20 - Pete's Scratch Built Minimalist SSB Transceiver (Pete's Simple Seven SSB Transceiver)
• N6QW's Mini_Rig - Pete's Small Rig using the Plessey 2N3904/2N3906 Bilateral IF Amplifiers and Si5351 VFO/BFO

• 10 bands, 10 watts SSB by Peter (DK7IH) - A compact multiband SSB transceiver for all high frequency bands from 160 to 10 meters
• Projects by Peter (DK7IH) - Projects for the radio draftsman. Hardware, software, electronics and test equipment for the radio designer
• AM Superhet Radio - A post that documents Luc Small's build of the 8 transistor AM superhetrodyne receiver
• Schematic of AM Superhet - By Luc Small
• 4 Transistor AM Superhet - YouTube by emuman100
• AM Superhet Project Showcase EE241L 5-11-16 - YouTube by emuman100
• QRP HomeBuilder - Component level (mostly analog) electronics from microwave to AF
• BITX40 QRP SSB transceiver: Description and demonstration - By Peter Parker VK3YE
• The Beach 40 - 7MHz Double Sideband Transceiver - By Peter Parker VK3YE
• 80m - 10m homebrew SSB transceiver with SI5351A - By HA8SA
• Minimal homebrew single band CW transceiver - By HA8SA

• VK3YE - Peter Parker
• VE3OOI - Dave
• Paul's (VK3HN) 'Summit Prowler 7' - Homebrew Scratch-built SSB CW 50 watt transceiver for 80 to 20m
• Paul's (VK3HN) webpage - Homebrew artisan extraordinaire - Exceptional hand crafted rigs with an emphasis on miniaturization
• Paul's (VK3HN) YouTube channel - Homebrew artisan extraordinaire - Exceptional hand crafted rigs with an emphasis on miniaturization
• M0NTV Homebrewing - Scratch built rigs by Nick (M0NTV) - YouTube
• Dave Richards (AA7EE) - Dave Richards (AA7EE)
• Level UP EE Lab - YouTube channel about designing, building, and troubleshooting projects of intermediate to advanced complexity
• Bitx based 6 meter (50 MHz) SSB transceiver - YouTube by PA3CRX
• KK4DAS - Amateur Radio Explorations - Furlough 2040 homebrew rig build - (The Red Roadrunner)
• YouTube videos of Furlough 2040 - By KK4DAS
• Simple Home-Built Radio Projects - By Rick Andersen
• Build a shortwave radio using 2N4124's (2N3904) and one 2N3906 - Gregory L. Charvat's blog - PDF Schematic and block diagram
• Single Band Receiver with Adjustable Crystal IF Filter - By WA3TFS
• RF Technical Articles and links - By Iulian Rosu (YO3DAC - VA3IUL)
• DIY HAM Radio Transceiver - YouTube by Stefan Meyre (HB9GZE)
• Homebrew Ham Radio Builds - By NA5Y
• Building a Transceiver Paperback - By Eamon Skelton (EI9GQ) and Elaine Richards (G4LFM)
• Home Building a Complete Radio Station - By Frank Harris (KØIYE)
• Designs for Amateur Radio - Information on projects by WA3TFS published in QST and elsewhere including firmware downloads
• Ham Radio Secrets Revealed - By Claude Jollet (VE2DPE)
• Radiofun232 on YouTube
• Web Site of KE3FL - Philip Karras
• Solid Signal Blog - Home of Karras' Corner
• Homebrewing - Everything related to HAM radio by W1WC
• Stefan Meyre, HB9GZE - DYI Ham Radio and more...
• Jeff Damm's (WA7MLH) homebrew webpage - Homebrew superstar
• Alan's (W2AEW) YouTube channel - Required viewing for any Ham or Electronics enthusiast!
• PTO based 80m direct conversion receiver - Alan's Lab
• The Neophyte Receiver (Build project by PA3HCM) - Simple Direct-Conversion receiver project
• The Neophyte Receiver - Simple Direct-Conversion receiver project
• How to Design a Crystal Filter - IMSAI Guy
• KC9DLM's projects
• VE7CA - HBR-2018 HF 160 to 6 meter High Performance All-Mode Transceiver
• Charlie Morris'(ZL2CTM) YouTube channel - Outstanding Homebrew rigs
• Hans Summers
• Pete's (N6QW) Home of Real Radio
• Pete's (N6QW) Homebrew Radio Blog
• Pete's (N6QW) Homebrew Radio Website
• Dean's (AC9JQ) YouTube channel
• KB6NU's Ham Radio Blog
• Secret Life Of Machines - The Radio (Remastered June 2021)
• Secret Life Of Machines - The Radio
• Hackaday
• ZL2PD - The incredible Homebrew designs of Andrew Woodfield
• Circuit Salad - Electronic design ideas from Ray Ring (e.g. Compact Si5351 based SDR, GPS)
• Let's talk about electronics - By Iacopo Giangrandi (HB9DUL)

C and C++ Programming Information and Tools

• Live C compiler - See the results of C+ code execution immediately
• CS50x 2021 - Free 11 week Harvard on-line course - Introduction to computer science and the art of programming.
• Cprogramming dot com - C and C++ reference
• Cplusplus dot com - C++ reference

Heathkit

• Official Heathkit Manuals - Data Professionals Company
• Explorer AM: TRF AM radio receiver - GR-152-BK
• Most Reliable Clock - GC-1006
• Precision RF Meter - HM-1002
• The Heathkit SW-717 General Coverage Receiver - YouTube by Jeff Tranter
• The Heathkit GC-1A Mohican General Coverage Receiver - YouTube by Jeff Tranter
• The Heathkit SW-7800 General Coverage Receiver - YouTube by Jeff Tranter
•

Podcasts

• SolderSmoke - Bill (N2CQR)
• SolderSmoke (YouTube) - Bill (N2CQR)
• QSO TODAY - Eric Guth (4Z1UG)
• Ham Radio Workbench - George (KJ6VU) and Jeremy (KF7IJZ)
• Chat With The Designers - George (N2APB)

Bitx,uBitx and sBitx Related

• Daylight Again - An all Analog PTO tuned Radio - By Ashhar Farhan (VU2ESE) 8-4-2022

• sBitx (Schematics and Code) - The SDR for the homebrewer - by Ashhar Farhan (VU2ESE)
• Bitx to sBitx (YouTube by RSGB) - The journey of this range of transceivers, by Ashhar Farhan, VU2ESE
• sBitx (LARC-4 Live Stream YouTube) - Presentation by Ashhar Farhan (VU2ESE) on Subba Readdy's YouTube channel

• uBitx Circuit Analysis and Testing - By Jonathan Kayne
• Building a basic QRP homebrew BITX - Part1 - by Mark G0MGX
• Building a basic QRP homebrew BITX - Part2 - by Mark G0MGX
• Building a basic QRP homebrew BITX - Part3 - by Mark G0MGX
• Building a basic QRP homebrew BITX - Part4 - by Mark G0MGX
• Bitx40 portable by VK3YE - YouTube
• BITX40 - Circuit Description - HF Signals website - Ashhar Farhan (VU2ESE)
• Antuino -RF instrument for SWR, field strength, modulation, etc. - HF Signals website - Ashhar Farhan (VU2ESE)
• Antuino schematic - Ashhar Farhan (VU2ESE)
• GitHub for antuino v2.1 - Ashhar Farhan (VU2ESE)
• uBITX build by the CCARC - Carroll County Amateur Radio Club, Inc.
• HF Signals - uBitx and Antuino by Ashhar Farhan (VU2ESE)
• uBitx v6.1 Assembly - YouTube video of Dave (KE0OG) assembling the uBitx
• Bitx Groups.io Homepage - For constructors of BITX projects to discuss all aspects of the design and construction
• uBitx dot Net - Mike Woods' (ZL1AXG) uBitx modification site
• KC0WOX - Leonard's excellent website featuring Bitx and other RF related videos and test procedures

The 6 Transistor Radio of the 1960's

• The 6 transistor radio - Detailed circuit description and information
• Transistor Radio Diagrams - By Lucio Roetta (IK3HIA)
• Lucio Roetta IK3HIA - Lucio Roetta's (IK3HIA) website

3.2" Display Boards compatable with Arduino Controllers (some may require 3.3v to 5v logic level shifters)

• 3.2" Inch 320X240 SPI Serial TFT LCD Display - Sold by: alice1101983 on ebay

5.0" Display Boards compatable with Arduino Controllers (some may require 3.3v to 5v logic level shifters)

• RA8875 Driver Board for 40-pin TFT Touch Displays - 800x480 Max - Adafruit

Large Display Boards with Integrated ESP32

• Elecrow - Display Catalog 2.8" to 7.0" 800x480
• Elecrow - 4.3"-HMI ESP32 Display 480x272 RGB TFT LCD Touch Screen

SWR Meter and RF Detector Bridge

• How To Build An SWR / Relative Power Bridge - Part 1 - Randy's (K7AGE) Pineboard SWR Meter
• How To Build An SWR / Relative Power Bridge - Part 2 - Randy's (K7AGE) Pineboard SWR Meter
• How To Build An SWR / Relative Power Bridge - Part 3 - Randy's (K7AGE) Pineboard SWR Meter
• Calculate VSWR from Forward and Reverse RF Power - Bradley's (KN9B) Digital SWR Meter Project
• W6PQL - A 1.8 to 54MHz Dual Directional Detector
• The tandem match - a closer look - By Iacopo Giangrandi (HB9DUL)
• How a Directional Coupler in an SWR meter works - Alan Wolke's (W2AEW) excellent video #196
• SWR Demystified - David Casler (KE0OG) Ask Dave Episode #28
• An Experimental RF Power Meter using Arduino - YouTube video By G0MGX
• An Experimental Power Meter using Arduino - Final Musings - YouTube video By G0MGX

SDR Homebrew

• mcHF SDR m0nka TRX KIT (A-Z assembly) v.0.6.3 - YouTube By OM0ET
• DK4DDS Homebrew SDR - A homebrew SDR with 10W driver (RD16HHF1 MOSFET drivers)and 100 watt PA (RD100HHF1 MOSFET finals)
• HackRF SDR - Getting Started With The HackRF, Hak5 1707

Electronic Projects

• TechLib.com - A technical library for the hobbyist and electronics experimenter
• New Lightning Detector - TechLib.com

Search Engines

• DuckDuckGo
• Google
• Bing

Part Search

• DigiPart - Parts Search
• Ciiva - Parts Search

Modules • Boards • Displays

• Mostly DIY RF - The Mostly DIY RF Website and Product Offerings from K7TFC
• DF Robot - Various development and sensor boards for Arduino, Raspberry Pi and others
• Proto Supplies - Prototyping supplies for Arduino
• Adafruit Industries - Modules for Arduino, Libraries, Tutorials
• Arduino MEGA 2560 (mini)
• Arduino MEGA 2560 (full size)
• Nokia 5110/3310 monochrome LCD
• 320x240 2.2" 18-bit color TFT LCD display
• Si5351A Clock Generator Breakout Board - 8KHz to 160MHz
• Teensy 4.0 Development Board

Kits

• M1 Series Modular Transceiver Kit - by Minikits - Australia's Largest range of Electronic Kits and Components for the Radio Experimenter
• HF Signals - uBitx and Antuino by Ashhar Farhan (VU2ESE)
• QRP Labs - Radio kits by Hans Summers
• KN-Electronic • English translation
• Heathkit
• Pacific Antenna/QRP Kits
• High power RF amplifier decks and basic kits - By W6PQL
• A 1.8 to 54MHz High Power Combiner Set - By W6PQL
• A 1.8 to 54MHz Dual Directional Detector - By W6PQL

References and Data Sheets

• Ham Radio Magazine - On-line Archive
• HTML Codes Table
• Datasheets for IC and Transistors
• EMRFD - Errata for Chapter 3 of EMRFD

Link pages from other hams to Homebrew Circuits

• Loftur E. Jónasson - TF3LJ / VE2LJXR - Repository for recent Amateur Radio Projects
• Learn on the fly - RF, Amateur radio, Microcontrollers
• Homebrew RF Circuit Design Ideas
• Electronic Circuit Diagrams from SatSleuth

Balanced Feeder Antenna Match Projects by Others

• A Balanced Tuner - By Ashhar Farhan (VU2ESE)
• A balanced antenna coupler and multiband tuned feeder dipole - By Peter Parker (VK3YE)Description
• WZ5Q's Super Massive Tuna
• Balanced Transmatch designs for 28 to 450 MHz

Doublet Antenna

• 80-Meter Doublet Antenna - By KV5R

Circuit Board Manufacturers

• OSHPARK - circuit boards
• PCBway - PCB prototype service

Circuit Simulators, Designers, and Calculators

• Band Pass, Low Pass and High Pass Filter Calculator - From Marki Microwave, Inc.
• Air Cored Inductor Calculator - By M0UKD
• Superheterodyne Oscillator Tracking - Three-point tracking calculator By VK3BHR

• Guide to RF Circuit Electronic Design
• Coil-Shortened Vertical Antenna Calculator - By 66pacific.com
• Coil Inductance Calculator - By 66pacific.com
• Low Pass and High Pass Filter Calculator - WA4DSY
• everythingRF - RF Calculators
• Coil Calculators - "Professor Coyle" Cylinder Coil and spyderweb coil calculators
• Toroid Winding Calculator
• RF Bandpass Filter Designer
• RF Low Pass Filter Calculator
• RapidTables - Online Calculators & Tools
• Crystal ladder filters - By Iacopo Giangrandi (HB9DUL)
• Watts - dBm - Volts Converter - Convert RF watts across 50 ohm load to P-P volts, et cetera
• LTspice - SPICE simulation software
• Attenuator Calculator
• Wire Gauge Size Chart - By RapidTables
• Smith Chart Sheet - A blank PDF form from RichardsonRFPD
• Circuit Diagram - Free Design and Share Circuits
• CircuitLab - Online Design and Share Circuits
• DigiKey Scheme-it - Online Design and Share Circuits
• Schematics.io - Online Schematics Editor
• PartSim - Online Circuit Simulator
• CircuitMaker - Online PCB Design and Project Sharing

Flux

• Flux - PCB Design and Simulation with AI

KiCad and Oshpark

• An Intro to KiCad - YouTube
• KiCad Download - Digi-Key
• Oshpark - Low cost PCB fabrication service

PCB Layout Software

• Express PCB - Free PCB Design Software
• PCB123 - Free PCB Design Software
• FreePCB - Free PCB Design Software
• FreePCB - Free PCB Design Software
• Eagle Light - Free PCB Design Software
• PCB Artist - Free PCB Layout Software
• TinyCAD - Free Schematic Capture and PCB Export
• DesignSpark - Free Schematic & PCB Design Software
• DipTrace Light - Free Schematic and PCB Software
• PCB Creator - Free PCB and Schematic Capture Software
• CADSTAR Express - Free PCB Design Software

Personal Computers, Hard drives, Monitors

• Newegg
• Newegg Refurbished PC's - My last four HP Windows 10 Intel i5 and i7 PC's have been refurbished HP units purchased from Newegg at a fraction of the price of new, which included OEM Windows 10 Pro installed. I have been runnig these PC's trouble-free for several years. These PC's appear to be off-lease returns from fortune 500 companies.

Z80 Programming Information and Tools

• SB-Assembler 3 - Assembly language Cross assembler for Z80 and many other microprocessors
• ZED80 - Build your own Z80 SBC (single board computer)

Linux

• 14 Lightweight Linux Distributions to Give Your Old PC New Life - MUO (From Make Use Of)
• Linux Lite - Lite was developed to help Microsoft Windows users make the jump to Linux easer
• Zorin OS - Zorin OS
• Tiny Core Linux - The TinyCore ISO image is only 21MB

Raspberry Pi Programming Information and Tools

• Raspberry Pi Stock Indicator Touch Lamp with NeoPixels - YouTube from Design Build Destroy
• Use Your Android Phone Or Tablet As A Raspberry Pi 400 Screen - YouTube from ETA PRIME
• Android As Raspberry Pi Screen - Reddit post from bazliamin
• Node-RED - Low-code programming for event-driven applications

Arduino Programming Information and Tools

• Upload Hex File to Arduino using xloader - YouTube by Aneeshmurali
• Extract HEX File from Arduino Board - YouTube by Aneeshmurali
• Upgrade a Arduino NANO Clone From Old Bootloader to New Optiboot - YouTube by Design Build Destroy
• Program the Arduino using Assembly language - An excellent tutorial using command line tools to program the AVR ATmega328p microcontroller (used in the Arduino) in assembly language. If you long for the days when you programed vintage microprocessors such as the Z80, 6502, 6800, with basic command line tools of yesteryear, but have been hesitant in investing the time and effort installing and scaling the learning curve of more complicated tools such as AVR Studio, this is the tutorial for you! Using this tutorial and the SB-Assembler (in the link below), you'll be programming like you did back in the '80's :-)
• SB-Assembler 3 - A very fast and lightweight cross assembler that runs on Windows 7 / Windows 10 for many microprocessors and microcontrollers (such as the Atmel AVR families ATmega328p, Z80, 6502, 6800, 8051, et cetera)
• How to load Hex files into Arduino - Load Hex file into Arduino using AVRDUDE
• Burn Bootloader - Burn Bootloader into an Atmega2560 using Arduin Uno as ISP
• Burn Bootloader - Burn Bootloader into an Atmega328P using Pololu AVR
• ASCII table - American Standard Code for Information Interchange character codes
• Ultimate Beginner's Guide to Run TFT LCD Displays by Arduino - By ElectroPeak
• Controlling multiple 7 segment displays with Arduino and 74HC595 Shift registers - YouTube video by Mario's Ideas
• How To Expand Digital Inputs with the 74HC165 - YouTube video by Kevin Darrah
• Gammon Forum - Information about microprocessors, in particular the Arduino
• Adafruit GFX - Information on how to use the Adafruit GFX graphics library
• RGB565 - Define colors for Arduino using RGB565 format
• TTF Font converter - Convert TrueType Fonts to Adafruit GFX
• Google Fonts
• Arduino Graphical IDE - Mixly, the free open-source graphical Arduino programming software, based on Google's Blockly graphical programming framework
• Download Mixly Software
• Arduino port manipulation examples
• Arduino Tutorial
• Reading multiple DI pins in parallel as one byte/word
• Technoblogy - Arduino and AVR projects (e.g. Simple Rotary Encoder, getPixel() info)
• Arduino Pin Change Interrupts - The Wandering Engineer

Frequency counter (32-bit Arduino based frequency counter by Scott W Harden, DMD, PhD)

• New! - Project details on Scott's website- USB Frequency Counter with 7 segment display module
• Older - Project details on Scott's website- VHF Frequency Counter With PC Interface
• As featured on Hackaday - Very Simple PC Frequency Counter Works Up To 100Mhz
• SN74LV8154 Datasheet - The 32 bit counter at the heart of the project
• SN74LV8154 - Available from Mouser
• AVR project source code - Scott's GitHub page

WWV Time Standard Receiver

• WWV Time Standard Receiver - Designed by WD8DSB
• WWV Time Standard Receiver - QST Article (Google Docs PDF)
• WWV Time Standard Receiver - YouTube from WD8DSB

GPS Disciplined Oscillator

• GPS Disciplined Oscillator - YouTube series by David Skirmont

Miscellaneous

• Will Old CB Radios Work On The Ham Bands? Part-1 The Receiver - By John Hawkes
• CB on Ham Bands - By John Hawkes
• CB on Ham Bands - A Look Under The Hood - By John Hawkes
• CB Radio 1969 Philadelphia PA Part 1 - By ArchivePix
• CB Radio 1969/ 1970 Philadelphia PA Part 2 - By ArchivePix
• CB Radio Setup and install in a cabover - Bruce Wilsonx
• What Happened to Cabovers? - RoadPro
• N3CVJ - Website of N3CVJ
• VFO for CB radio - By Wander Lúcio Gomes. (PU4WLG)
• VFO for CB radio - YouTube video By cbradiomagazine
• Radio Shack Catalogs - Archive of Radio Shack catalogs from 1939 to 2003
• Hak5 - InfoSec and cyber security (YouTube)
• Wheelwright trade - YouTube from EngelsCoachShop
• Building 1,080 lb Wood Wheels for the Borax Wagons | Massive Wheelwright Work - YouTube from EngelsCoachShop

Internet Speed Tests

• Ookla's Speedtest
• Comcast's Xfinity xFi speed test
• Netflix's Fast.com
• Broad Band Now - Find Every Internet Provider in Your Area
• The FCC's Speed Test app - Mobile only - Android app and an iOS app
• Here's how 2022 will bring us faster internet - From ZDNet