Note: Most of the sections of this website have their own links pages.

Automation, Control and Technology
Control Automation - Industry news and technical articles.
Electronics Point - Information and commentary.

Radio Theory and Practice.

For books and papers, see: Electromagnetics Links Page .
Serge Stroobandt ON4AA. Radio and EM propagation.
ARRL Periodicals QST, QEX, Ham Radio, Communications Quarterly (CQ) can be purchased on CD ROM from

Vintage Radio and Electronic.
 Porthcurno Telegraph Museum .  .
 New York's Broadcasting History .
Skywaves (Al Klase N3FRQ - Radio articles, including RA17)
Mike's Electric Stuff .
Alternator, Arc and Spark. Dr Duncan Cadd G0UTY.
Sphere Research Test Equipment Site (Nixies, CRTs, useful links for vintage electronics enthusiasts).

Vintage RACAL.
Keith's vintage RACAL enthusiast's site.
IJL (OH5HOI) Technical Pages (RA117 full manual etc.)

RF Measurement.
SDR Kits - DG8SAQ VNA3 etc.
N2PK (Paul Kiciak), Radio Projects Page: Vector Network Analyzer.
mRS (mini Radio Solutions): mini VNA.

Engineered Composites Ltd: Fibreglass (GRP) poles etc.
Amidon Associates: Ferrite components. W2FMI Books.
M0WWA: RF transformer cores and circuit modules. Wires tapes and foils.
Golledge (Filters & Xtals).
Vine Antenna Products INRAD filters for Kenwood and other transceivers.
Donberg Electronics (current and replacement electronic parts)
Mouser Electronics .
Communication Concepts (HF Power amplifier and LPF kits, RF Power transistors)
Shor International (Solders, tools, machinery))
PEI-Genesis (connectors, cable accessories, tools and interconnects - including exotica like Sure-Seal IP67 USB connectors)

Manuals and Equipment Info.
Collins Collectors Association.
Mauritron Technical Services: UK commercial source for service manuals.
MFJ Enterprises website (Manuals and other docs are available for download)
SGC Web Site. (Manuals and other docs are available for download)

Software. (free office suite including spreadsheet and equation editor).
OpenOffice Basic Programming guide .
StarOffice Basic Programming guide (precursor to OO Basic)
Linear Technology (LTspice / SwitcherCAD. Free general-purpose SPICE simulator with heirarchical schematic capture and hundreds of models for LT products. Runs under Windows® or wine).
4nec2 NEC-based antenna modeler and optimizer (free NEC modelling).
4nec2 forum .
EZNEC Antenna modeling program (not free).
Finite Element Method Magnetics, free finite element analysis program by Dr David Meeker (thanks to Dr Duncan Cadd, G0UTY, for the link)

Electrical Engineering
Note that American and European electrical standards differ considerably. European and British domestic electrical supplies are single-phase 230V 50Hz, with different sockets types in different countries (UK 13A, German Schuko, etc.).  N American domestic 60Hz single-phase supplies are often derived from a centre-tapped 240V utility transformer with a 120V feed to the domestic sockets.
Residential Electrical Circuits Explained (N America).
Electical wiring in the UK (Wikipedia). Gives pre 2004 and current wiring colours (particularly dangerous when mixed in a 3-phase system). Also mentioned is the ring-main circuit, widely used in the UK but rare elsewhere.

Electrical Basics
The following link, offering a more gentle introduction compared to my usual Fundamental Physics approach, was suggested by Hannah Bass and forwarded to me by her Mother Michelle: / Volts and Currents explained .