ITU News caught up with Otava Tuomi to learn what ham radio means to him as a young amateur radio operator, and its role - and revival - amid the COVID-19 pandemic.

Antennas/Antenna Calculators
The Magloop Antenna Calculator was developed to predict the characteritics of a small-loop (aka magloop) antenna, given physical dimensions entered via slider widgets. This magnetic loop antenna calculator works also on most mobile devices, adjusting sliders and calculating dimensions in real time.

Antennas/6M
A 30 cm antenna for the six meters band in japanese

Hairpin antenna for 40m band, AGWQSLPrint, Improving Gain of the Super J-Pole Antenna, FreePCB, Linear Loaded 40m Dipole, Coaxial Collinear Antenna for 70 CM Band, 40m loaded dipole, VSP Manager,

Manufacturers/Antennas/HF/HexBeam
New generation Hex Beam Antennas. VHQ HEX Products, located in Peterborough, NH, is owned and operated by David M. Lavoie. Our products are designed to solve issues encountered in Ham radio applications and move with todays configurations in an ever changing climate

DX Resources/QSLing
Article on the OQRS M0URX service and demands by dxpeditioners with examples and features of this original QSL service

What does 73 mean, G7FEK antenna revisited, Quad Band Inverted V Antenna, ICOM IC-R9500 Review, Arduino si5351 VFO sketch , A QRP Transmatch ATU, Bridgerland Amateur Radio Club

Pocket-sized SSB CW RTX for HF Bands, Portable SSB transceiver for 14MHz, The DxDozer, DxCalendar by DXCenter, 40m CW QRPp/QRP transceiver , AGWMorseTrainer, DL4YHF PIC-Keyer

Technical Reference/Transverters
The original project was published in July 1993 QEX magazine. IF of 28 MHz for Tx and Rx. Original Design by Zack Lau (W1VT), this project and supplemental notes by Rick Bandla (VE3CVG)

Technical Reference/Software Defined Radio/RTLSDR
Experiences with software defined radios SDR and active antennas using the RTL SDR dongle and Spyverter HF up-converter

Antennas/2M
2 Wavelength ,2 Meter Bi-Square Beam , 5dbd gain. This antennas are very cheeap to build and their radiation pattern is similar to a figure 8 with maximum signal through the loop but they may be used as a near-omnidirectional antenna

Shopping and Services/Regional/Europe
Ham Radio Dealer based in Holland dealers of most relevant ham radio brands. Transceivers, antennas and accessories for amateur radio and marine radio markets.

5 Band Pipe Vertical Antenna, Moxon Beam for 2m, Simple J-Pole for the 2m band, Ham Radio: Using Repeaters, WebSDR Wismar, DARC Contest Calendar, VSPE - Free Serial Port

IC-R20 by Icom. Wideband Receiver Professional radioreceiver, allow double receiver, from HF to Microwave, digital recorde, DTCS, Memories and 11 hours countinuous reception.

Antennas/6M
The antenna described in this article is for 50 MHz, but the design can be scaled for any band, including VHF, UHF, or even the higher HF bands. The antenna is nothing more than a square loop of wire, approximately 30" (or ~76cm) per side. The loop is fed in the middle of one side, and the opposite side to the feed point has a gap in it.

Antennas/Folded Dipole
A small dipole antenna installed inside a balcony. This linear loaded short dipole antenna has been designed at first for the 21 MHz and then adapted for the 20 meters band.

Technical Reference/Coax Cables and Connectors
An technical page on coaxial cables that describes what coax cables are, how do coax cables works, what are RG cables and difference with several coax cable types, what they are used for, connector types and cable sizes

Antennas/Baluns
How to wind toroids in making baluns, using two pieces of 0,5 mm enameled wire in parallel.

Operating Aids/Grid Squares
An online interactive grid square map made with openstreet map. Just point and click and zoom in to determine an accurate grid square locator till 10 digit resolution

Antennas/Fan Dipole
How to build Fan-Dipoles by DK7ZB. Experiences with various band combinations. Not all combinations are working properly. If the frequencies are to close together the impedances will lead to a very bad SWR. This happens with the bands 10-12-15m or 15-17-20m.