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
InnovAntennas announce DX Engineering
InnovAntennas announce DX Engineering to be the exclusive North American reseller. Not long now and you will be able to buy our LFA-Qs direct! Read more
ICOM AH-710 Folded Dipole Antennas AH-710
Wire Antenna, Assembled, Multi-Band, Non-resonant, 150 W, UHF Male, PL-259, 80.3 ft. Length, Each Wire Antenna Band Wire Antenna Frequency 160 meters... Read more
TN07 SFP-102 32′ Flagpole HF Ham Radio Antenna for POTA
“One of the Ham Radio Antennas that I have used most often for POTA – Parks on the Air – is the TN07 SFP-102 32′ telescoping f... Read more
![Antenna Fundamentals 1 Propagation [ Video ]](https://qrznow.com/wp-content/uploads/2016/06/d01645880bc21d293eab203a20ce8adf-190x122.jpg)
Comparing Elevated 1/4w Vertical vs. Link Dipole with WSPR
“Hello Ham Radio Ops, K5ACL from SignalSearch here with another Antenna comparison/testing video using the Weak Signal Propagation Reporter (WSP... Read more
App - Mobile
AmsatDroid FREE – APP
This software predicts future passes for amateur radio satellites for a specified location and period of time. Basic features: – Calculate passe... Read more
SmartSDR for iOS v3.9.12 Now Available
Marcus, DL8MRE announces that release of SmartSDR for iOS v3.9.12 is now available for download or update from the Apple App Store. SmartSDR is a full... Read more
Hamradio Line Loss Calculator for iOS devices
Coax Line from Federico Romano, IW2MVI is a simple and fast app that allow you to calculate the loss of your coax line and calculate power output from... Read more
RUMlogNG2Go for iOS version 3.3 now available
Thomas Lindner, DL2RUM, is happy to announce the availability of version 3.3 of his RUMlogNG2Go logger for the iPhone and iPad. RUMlogNG2Go can be do... Read more
Free App Allows Blind Hams to Work PSK31
A free, new app — Accessible Digipan — has been released that allows blind hams to operate PSK31. The download includes the app, audio tutorials, deta... 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
FT4 Video presentation by K1JT
See More about New FT4 Here “At about 20 minutes into the presentation, Joe describes FT4 as being asynchronous, meaning that you can start tran... Read more
Digital Mode Operators Invited to Take Part in 2016 Most Wanted DXCC Entities Survey
Digital mode operators are invited to participate in the 2016 Digital Mode Most Wanted Survey. Previously known as the “RTTY Most Needed DXCC Entities... Read more
HAMS TALK DIGITAL
by:Al Williams Morse code qualifies as a digital mode, although organic brains are somewhat better at copying it than electronic ones. H... Read more
WSJT-X 2.0 – New 77-bit messages information update
“Hi all, Many of us have made many QSOs using the new 77-bit messages on 7.078 and 14.078 MHz. Overall the results have been good — but no... Read more
Review
Comparing the Elecraft KX2 and the Icom IC-705. Which should I buy?
Comparing the Elecraft KX2 and the Icom IC-705. Which should I buy? Read more
Review of BTECH UV-25X2 Mobile 2m/70cm FM Radio
what Makes the UV-25X2 Unique: Dual Synchronize Display Mode, Mic Audio Gain Settings, Expanded Frequency Range (up to 520MHz), In depth user’s... Read more
Luiton LT-898UV Ultra Portable Go Box Kit – Ham Radio Q & A
“You may have seen my previous video in which I reviewed the Luiton (Leixen) LT-898UV 10 watt mobile radio. In this episode I build an ultra por... Read more
The Malahit DSP portable SDR receive
A nifty little portable SDR receiver. I still have lots to explore with it, but here’s an overview. 【Frequency Range】50 kHz~2.0GHz (Registered v... Read more
Measuring Coaxial Cable Losses @ HF, VHF, and UHF frequencies.
Measuring Coaxial Cable Losses @ HF, VHF, and UHF frequencies. Read more
