The May/June issue of QEX will be showing up in subscriber mailboxes soon. Here’s what they have to look forward to . . .
· Steven J. Franke, K9AN, and Joseph H. Taylor, K1JT, share an under-the-hood description of the JT65 decoding procedure, and include a new algorithm for its powerful error-correcting code.
· Ron Berry, WB3LHD, shows how he converted the classic Heathkit SB 1000 HF amplifier into a 6-meter work horse.
· Bill Echols, NI5F, extends the definition of Maidenhead grid locators from the currently defined 8 characters to 16 characters, thus improving location precision to inches.
· Glenn E. Elmore, N6GN, measures 10 meter propagation attenuation using a quadcopter.
· George R. Steber, WB9LVI, uses a wide-band noise generator as an alternative to a tracking generator to measure filters and other components with a spectrum analyzer, and compares the two methods showing several examples.
· Ray Mack, W5IFS, Demystifies proportional-integral-differential (PID) control loops and gives insights into how to build and tune one.
QEX is edited by Kazimierz “Kai” Siwiak, KE4PT, (firstname.lastname@example.org) and is published bimonthly. QEX is a forum for the free exchange of ideas among communications experimenters. The content is driven by you, the reader and prospective author. The subscription rate (6 issues per year) for ARRL members in the United States is $24. First Class delivery in the US is available at an annual rate of $37. For international subscribers, including those in Canada and Mexico,QEX can be delivered by airmail for $31 annually. Non-members must add $12 to all rates. Subscribe today at www.arrl.org/qex.
Would you like to write for QEX? We pay $50 per published page. Get more information and an Author Guide at www.arrl.org/qex-author-guide. If you prefer postal mail, send a business-size self-addressed, stamped (US postage) envelope to: QEX Author Guide, c/o Maty Weinberg, ARRL, 225 Main St, Newington, CT 06111.
Ray Novak, N9JA, the Amateur Division Manager for Icom America is interviewed by Tim Duffy, K3LR during Ray’s visit to DX Engineering in Tallmadge Read more
Two young ARRL members are among the more than 100 attending the Youngsters On The Air (YOTA) camp in the Austrian mountains this week. Sterling Coffe... Read more
Introduction Number of Earthing Electrode and Earthing Resistance depends on the resistivity of soil and time for fault current to pass through (1 sec... Read more
The Hurricane Watch Net (HWN) has announced plans to activate for the now-Category 4 Hurricane Irma on Tuesday, September 5, at 1800 UTC on 14.325 MHz... Read more
“This is a demonstration of using FLDigi software to work with the Olivia digital communications keyboard-to-keyboard mode used in the amateur r... Read more
ARRL members who are federal employees can support the ARRL by participating in the Combined Federal Campaign (CFC). Pledges during the 2014 CFC toppe... Read more
by By Angela Rozier WEST PALM BEACH, Fla. —South Florida amateur radio operators are also keeping a close eye on Tropical Storm Erika. They’re r... Read more
Amateur Radio Licence – Ofcom publishes updated guidance for licensees In our statement ‘Updating the Amateur Radio Licence’, which we published... Read more
YL 33: The First Female Ham Radio Operators , and their Awesome Legacy by Ashley Hennefer Read more
The Hurricane Watch Net (HWN) will go on “Standby Alert” in the event that a strong tropical system bearing the designation “Invest 99L” becomes a nam... Read more
In an ex parte statement filed March 10 with the FCC, the ARRL has asked the Commission not to adopt “an overbroad” requirement for notification of ut... Read more
During a January 12 Capitol Hill hearing, US House Subcommittee on Communications and Technology Chair Rep Greg Walden, W7EQI (R-OR), called the Amate... Read more