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.
Antenna
MULTIBAND H-POLE – VERTICAL WIRE ANTENNA FOR 160m – 10m by HB9MTN
“After several attempts to build a multiband C-Pole I finally ended up with the Multiband H-Pole. C-Poles for different frequencies on one pole... Read more
The Rotator Illuminator Kit
The Rotator Illuminator kit by Idiom Press is a three-LED replacement circuit for the incandescent lamp in Hy-Gain control boxes. Buy this kit... Read more
Stealth Antennas by G0KYA
The first edition of Stealth Antennas quickly became the ‘must have’ antenna book for everyone who wasn’t living in acres of land. T... Read more
Building a 40 Meter Rotatable Dipole
40 Meter Dipole “I enjoyed putting these pieces together from MFJ Hy Gain, MFJ Cushcraft, Texas Towers, M2 and our local hardware store t... Read more
Antenna BEAM 11 elements 3 bands
11 BEAM antenna elements 3 bands Frequency [Frequency]: 28, 21, 14 MHz Number of elements [Number of elements]: 28 MHz – 5 el. 21 MHz – 3... Read more
App - Mobile
DX Hunter – The amateur radio App for DX-enthusiasts
DX Hunter – The amateur radio App for DX-enthusiasts Description DX-Hunter is an application for amateur radio operators, short wave listeners a... Read more
CWSpeed IOS App – The fun and efficient way of learning morse code
Description The fun and efficient way of learning morse code! Features: – Uses Koch’s training method (the most efficient known to date)... Read more
RFinder – The World Wide Repeater Directory now free trial on Android!
In order to support the proliferation of third party app stores worldwide, we have now released RFinder on Android as trialware! Just go download it f... Read more
New iOS App Available for The ARRL Repeater Directory ®
The ARRL Repeater Directory ® — introduced this week for 2015-2016 — has a newly launched companion app for Apple® iOS® devices. iPhone®, iPad®... Read more
RFinder – The World Wide Repeater Directory kicks BrandMeister up a notch. DMR without CodePlugs!
RFinder has worked with the DMR network Brandmeister to create new usability enhancements. The new dashboard just released includes coverage maps gene... Read more
Digital Modes
FT8 is exploding! – No Nonsense Amateur Radio Podcast #6
FT8 is exploding! 1#popular HamRadio digital mode In this episode of the No Nonsense Amateur Radio Podcast, Tom, KB5RF, and I explore... Read more
JS8Call 0.7 Released
J8Call “Howdy Folks, We’ve sure come a long way in the past few weeks. Thanks for sticking with me and enjoying the ride! This release is... Read more
Digital Mode FT-8 With Light Bulb Antenna 750 Miles!
Jim, W6LG tries FT8 using light bulbs as the antenna and communicates with another ham in Canada. The distance was 750 miles or about 1200km! This is... Read more
Goodbye FT8, Hello Olivia, The Magic HF Digital Mode
“So many people have started using FT-8 on HF, but they leave all the other modes to die off, like Olivia. Olivia isn’t new, but it offers... Read more
Release: WSJT-X Version 1.9.0-rc4
Changes from WSJT-X Version 1.9.0-rc3 include the following: – Corrected a number of flaws in Fox and Hound behavior, FT8 DXpedition Mode... Read more
Review
Retevis RT82 Dual Band DMR Digital Two Way Radio at ML&S Overview
Retevis RT82 Description RT82 is a dual band DMR radio Frequency band:136-174 & 400-480MHz 10000 Contacts IP67 Waterproof Use T... Read more
W6LG Makes A Dummy Load From Christmas Lights, Dummy Load That Lights Up The Room
Jim shows the two ways that he makes Christmas Lights into an Antenna and a Dummy Antenna. RF from his linear amplifier lights up the bulbs. Read more
Mountain Topper Radio review by G0POT
A review of the LNR Precision version of the MTR, Mountain Topper Radio a three band, CW only, QRP trail friendly transceiver. Mountain Topper Tri-Ban... Read more
Yaesu FT-450 HF and 6 Meter – QST – ARRL Product Review
Yaesu FT-450 Reviewed by Rick Lindquist, N1RL ARRL Contributing Editor The FT-450 is Yaesu’s latest entry in the HF/50 MHz transceiver field. It’s a s... Read more
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