This video illustrates how RF (radio frequency) standing waves are created in transmission lines – through the addition of the forward (transmitted) wave and the reflected wave that results from improperly terminating the line or matching the load or antenna to the transmission line impedance. I have done several videos that relate to transmission lines, terminations and reflections – all of which tell a piece of the story. This video is another piece, and I hope it helps you to understand how standing waves are formed and what the “look” like. This wikipedia link has some great graphics (shown in video)
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Via DXengineering Blog Many hams ask why they should bother to add the recommended radial field to their ground-mounted vertical antenna. There are re... Read more
Alpha Ez-Military Antenna, a complete 1KW PEP system for Military, Emergency Services, or restricted use environments. The 1KW Ez-Military system is a... Read more
Space Weather picks up this week as we await some fast solar wind from a coronal hole to hit Earth. We have already felt the effects from two mini-sol... Read more
In comments (attached below) filed on May 26, the ARRL said it “strongly supports” a petition to the FCC seeking to eliminate an Amateur Service rule,... Read more
Icom have announced a significant firmware update for the IC-7600 HF Transceiver at the Dayton Hamvention 2015. The update provides a new range... Read more
Bob Behnken, KE5GGX, was one of two NASA astronauts who made spaceflight history over the weekend. Behnken and Doug Hurley were the first astronauts s... Read more
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App - Mobile
EchoLink for iOS version 2.6.14 is now available
EchoLink for iOS version 2.6.14 is now available in the App Store. This is a 64-bit build that is fully compatible with iOS 10 and modern iOS devices.... Read more
Top 5 Ham Radio App
Ham Radio App If you’re a member of ARRL, the national association for Amateur Radio, install this app and have QST, the ARRL membership journal... Read more
CommCat 4 for Radio Control and Logging!
CommCat 4 is a radio control and logging program for radio amateurs who share a passion for talking to other hams around the world. CommCat works with... 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
QTH Locator Droid – Mobile App
The QTH Locator App was developed for HAM Radio use. This is the extended version of “Maidenhead Grid Locator” using Google Maps to show a... Read more
Equipment
HAL1200 Atlantic – HF linear amplifier
HF linear amplifier Specifications Frequency : 1.8 ~ 54 MHz, all Amateur Bands including WARC Automatic Band Change: only PTT/TXGND Signal, or with de... Read more
A $38.99 RTL-SDR with 100 Khz – 1.7 GHz coverage
RTL-SDR 100Khz-1.7GHz Full Band UV HF RTL-SDR USB Tuner Receiver/ R820T + 8232 Ham Radio 100% Brand New And High Quality Using the RTL2832 idle chann... Read more
SPE Expert 2K-FA Linear Amplifier
SPE Expert 2K-FA Product Specifications The smallest in its class. Built-in Power supply and Automatic Antenna Tuner. Dimension: L 38, H 18.3, P 43 cm... Read more
The ZN-HKR is new for 2015 by N3ZN
The ZN-HKR is new for 2015. It is an all brass straight key built on a 4″ diameter brass base. It features 4 ball bearing and silver con... Read more
RigExpert AA-230 ZOOM – Antenna and Cable Analyzer
RigExpert AA-230 ZOOM – Antenna and Cable Analyzer 100 kHz to 230 MHz The analyzer is designed for measuring SWR (Standing Wave Ratio), Return... Read more
News
Fire in Amateur Radio Club in Germany
On the evening of August 1, the clubhouse of an Amateur Radio club from Landshut near the sports ground of SC Landshut Berg came to a fire. The fire s... Read more
FCC Formally Adopts Proposals to Remove Amateur 3-GHz Band, Invites Comments
At its December 12 meeting, the FCC formally adopted a Notice of Proposed Rulemaking (NPRM) in WT Docket 19-348 and invited comments on its plan to re... Read more
ARRL Webinar: CHIRP Programming October 20, 2016
This ARRL webinar offers a brief overview of the free, open-source CHIRP software, which can be used to program most radios. It covers what CHIRP is,... Read more
Baluns and RF Chokes : Ham Radio Q & A Episode 3
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Software
Log4OM Release – Version 2.3.0.0
Release note – Version 2.3.0.0 • CAT frequency display is now user configurable for best visual comfort in Settings -> CAT • Added viewable Clublog... Read more
N1MM-ClubLog Gateway
By: Rick Ellison N2AMG Email: rellison@twcny.rr.com Web: www.n2amg.com Purpose: ======== This application will allow QSO’s logged in N1MM to be... Read more
Using FLDigi to Communicate with Olivia Digital Mode on HF by Tomas NW7US
“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
ExpertRC 1.3 alpha 1 for remote control – Expert Electronics
“Hi, everyone! Today we finally launching new ExpertRC 1.3 alpha 1 for remote control – https://eesdr.com/en/support-en/software-en In the... Read more
ExpertSDR2 Update With Many Enhancements
ExpertSDR2 version 1.1.3 with many enhancements and fixes for your SunSDR2 PRO, MB1 and ColibriDDC has been released after a long period of testing. W... Read more
![The Radio Amateur Society of Thailand ( RAST ) [ Video ]](https://qrznow.com/wp-content/uploads/2014/12/rast-265x168.jpg)
