The May/June issue of QEX, ARRL’s bimonthly magazine for experimenters, is off the press and in the mail!
In this issue . . .
Michael Knitter, DG5MK, describes a complex-impedance analyzer that uses a heterodyning technique and high resolution ADCs to get good accuracy at low cost.
Robert H. Sternowski, WBØLBI, uncovers old measurements, which show that vertically and horizontally polarized noise can differ by tens of decibels in the lower HF bands.
Paulo Renato F. Ferreira, PY3PR, updates the Octopus V/I curve tracer by providing selectable scanning voltages for testing.
Maynard A. Wright, W6PAP, provides Octave software for computing the performance of transmission lines having a complex characteristic impedance.
Riccardo Gionetti, IØFDH, describes an automatic tracking filter for a DDS generator.
Euclides Lourenço Chuma, PY2EAJ, describes a modern RF power meter with accuracy that rivals the best commercial RF power meters.
Not a QEX subscriber? Sign up today at https://www.arrl.org/qex-subscription-form. You can also read a free sample article from this issue at http://www.arrl.org/this-month-in-qex.
Walk or drive around with this handheld, directional noise finder with 3 element beam and meter to search out foxes, leaky insulators, loose ha... Read more
Design goals Like many fellow radio amateurs, I own a fairly standard shortwave radio station consisting of a 100W HF transceiver driving a 1kW... Read more
PA0NHC – active, capacitive receiving antenna Wideband 30kHz-30MHz Read Full Article: Read more
Custom Antenna Insulator online .STL creator You can generate own insulator for 3D printing online – precisely tailored of your diameter Read more
The M2 KT36XA is the result of many hours spent on perfecting the original KLM KT-34XA through computer optimization confirmed by range and actual on-... Read more
‘Satellite Explorer Pro’ is a tool for tracking satellites in real time. It is not a game. Be sure to visit the support web site http://ww... Read more
Wizkers:Radio is a controller for various Amateur Radio equipments. At the moment, it supports several Elecraft radios and amplifiers, as well as the... Read more
My LoTW is a viewer app for ARRL’s Logbook of the World. With My LoTW, you can: – View all the QSOs you have submitted to LoTW. –... Read more
What it’s all about A modern APRS app for iOS users, with models detection, frequencies detection, C4FM highlight… More features Receive l... Read more
“RFinder has been the ‘Social Repeater Directory’ for a while now with its support of repeater check-in postings to APRS and... Read more
In this project the Raspberry Pi with the PiCam is used as a wireless camera which can transmit images over long distances, usually hundreds of meters... Read more
The World Digital Amateur Television (DATV) QSO Party will celebrate its 5th year when it gets under way August 21-22. Organizer and anchor Peter Coss... Read more
Part one of our look at the Digital Modes. Read more
The winner of the September 2015 QST Cover Plaque award is Murray Greenman, ZL1BPU, for his article “FSQ: Fast, Simple QSO.” The QST Cover Plaque Awar... Read more
“HamRadioNow doesn’t do ‘unboxings’, and we don’t do product reviews per se, but this time we do both. A new BaoFeng UV... Read more
The TS-990S comes equipped with dual receivers for simultaneous reception on different bands, it also features narrow-band roofing filters on the main... Read more
“As you may know, a big percentage of this web site is dedicated to building antennas and not buying them, but sometimes an antenna comes along... Read more
“Radio Frequency Interference (RFI) Pocket Guide” by Kenneth Wyatt, WA6TTY and Michael Gruber, W1MG This small 88-page spiral bound (3” x 5”) pocket g... Read more
“I’m startin’ the year with a long overdue review of the QRPworks Sidekar. A super portable CW appliance built for the KX3. Oh yeah,... Read more