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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Time and frequency standard station WWV silenced its 25 MHz signal in 1977, but it returned to the air on an “experimental basis” a year ago, a... Read more
King County Executive Dow Constantine, fourth from left, presents the Tukwila Emergency Communications Team with the Executive’s Award for Community P... Read more
Starting on Monday, September 16, WWV and WWVH will broadcast a US Department of Defense message to mark the centennial of WWV and to announce the WW0... Read more
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By Scott Cousins – For the Telegraph COLLINSVILLE — When everything else fails, ham radio operators will still be there. For many amateur... Read more
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Recent Posts
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App - Mobile
NKCCluster 2.1 to be released very soon
A new NKCCluster release is just around the corner: release 2.1 is currently undergoing beta-testing and, provided no last minute surprises i.e. major... 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
What is Echolink? Ham Radio 2.0: Episode 56
Mark Goodrum, W5MHG, discusses Echolink for Ham Radio at the Duke City Hamfest Read more
DroidRTTY – RTTY for Ham Radio App Android
Ham Radio App DroidRTTY is an application to decode and encode Ham Radio RTTY with the build in microphone/speaker or wired to your radio. A wa... Read more
817 Companion for Yeasu 817 – App
Yeasu 817 The 817 Companion app is dedicated to all the proud owners and users of the Yeasu 817 amateur radio. The Yeasu 817 is a fantastic radio bu... Read more
Equipment
TVTR1 630m Transverter – 472-479 kHz
The Monitor Sensors 630m Transverter enables any Amateur Radio Station, equipped with a conventional HF transceiver, immediate, all mode, access to th... Read more
Ailunce HS1 HF SDR HAM Transceiver
Ailunce HS1 Specification: Frequency Range: 0.5-30MHz Operating Mode – SSB(J3E)，CW，AM(RX Only), FM, FREE-DV TX Power: Max to 15w Product Dimensi... Read more
Wideband RF Switch (5 – 3000 MHz)
Photo: Aditya Mukherjee In an application it was required to use 6 different antennas at 6 nearby locations one at a time as the Bluetooth/WiFi antenn... Read more
SMΩRF – RF Vector Power Meter
SMΩRF™ is the most powerful and accurate, in-line RF Vector Signal Meter to date with accuracy rivaling professional instruments. Has tons of features... Read more
Diamond CX-210N
The Diamond CX-210N is a low loss, two position coaxial switch providing very low loss and high isolation. It is rated DC to 3000 MHz and can handle u... Read more
News
ARISS Invites Proposals to Host Ham Radio Contacts with Space Station Crew
The Amateur Radio on the International Space Station (ARISS) Program is seeking formal and informal education institutions and organizations — individ... Read more
DK2OM receives IARU Diamond Award on retirement from his role as IARUMS coordinator
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Palstar TR30A – HF Transceiver
The Palstar TR30A is a new 100 watt transceiver optimized for Ham Band only reception using the best of legacy techniques combined with micropr... Read more
Very Limited ISS Slow-Scan TV Transmissions Set
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Updating the Firmware – Icom IC-7610 [ VIDEO ]
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Software
SmartSDR v1.9.9 Now Available for Download
FlexRadio Systems announces the immediate availability of SmartSDR v1.9.9 for the FLEX-6000 Signature Series SDRs. SmartSDR v1.9.9 is a maintenance r... Read more
Icom IC-7610 (Version 1.06), IC-7300 (Version 1.21) and IC-R8600 (Version 1.31) Firmware Updates
Icom Inc. has released firmware updates for the IC-7610, IC-7300 and IC-R8600 radio models. The firmware updates provide the following improvements: I... Read more
CubicSDR v0.2.0 has been released
CubicSDR is a cross-platform Software-Defined Radio application which allows you to navigate the radio spectrum and demodulate any signals you might d... Read more
New version of DX Monitor
Beta test versions of DX Monitor may be used for up to 30 days from their release date and will run even if your trial period has expired. If you trie... Read more
ST-4003W Time Adjustment Software For Selected Icom Amateur Radios
The ST-4003W is a Windows based software, which allows you to set the radio’s time from your PC’s time by connecting your radio to a PC. T... Read more
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