Where Does 468 Come From – half wave dipole
We’ve all seen this number over and over again – the “magic number” that gives us the length of a half-wavelength dipole in feet from the dipole’s resonant frequency: L…
Ham Radio, Fun Facts, Open Source Software, Tech Insights, Product Reviews
We’ve all seen this number over and over again – the “magic number” that gives us the length of a half-wavelength dipole in feet from the dipole’s resonant frequency: L…
A carrier frequency is a single radio frequency with steady amplitude. Alone, it would sound like silence on a receiver. This is the frequency that a radio receiver is tuned…
I would like to share about this website that i used a lot when doing shortwave listening on my free time. This website is very good, it can show you…
From Wikipedia, The WARC bands are three portions of the shortwave radio spectrum used by licensed amateur radio operators. They consist of 30 meters (10.100–10.150 MHz), 17 meters (18.068–18.168 MHz)…
VIVAnews – Penggunaan frekuensi di Indonesia masih belum tertata dengan baik. Hal itu bisa dilihat dari bocornya frekuensi radio yang masuk ke jalur komunikasi penerbangan dengan pihak Air Traffic Control…
http://www.google.com/patents/US7586462?printsec=abstract&dq=physically+small+spiral+antenna&ei=J1_QT4n2M9DOrQehlLiJDA#v=onepage&q=physically%20small%20spiral%20antenna&f=false
please watch this video first. A proword is short for procedure word, or phrase. MAYDAY is the proword for an emergency/distress call. OVER is a proword to signify that you’ve…
Yes, we need more CW operator on HF bands. Lately, i am so excited working CW on 20m. Following 9M2ZAK, i am not good as good as him but i…
The Electromagnetic Spectrum – The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength. Electromagnetic radiation is classified into types according to the frequency…
Following are the frequency ranges used in satellite communications. L-band (390 MHz-1.55 GHz) GPS satellites, satellite phones, misc commsats, SETI outer space exploration S-band (1.55-5.2 GHz) weather satellites, XM/Sirius radio…
The spectrum for transmission in singlemode optical fibers has been broken into the following wavelength ranges, or bands. Typically, the wavelengths transmitted in multimode fibers are around 850 and 1310…
The distance between crests of a wave. The wavelength determines the nature of the various forms of radiant energy that comprise the electromagnetic spectrum. For electromagnetic waves, the wavelength in…
The IEEE has recently released the new 802.22 standard for Wireless Regional Area Network (WRAN) using white spaces in the TV frequency spectrum. The IEEE 802.22 standard is designed to…
Frequency Charts 27th March to 29th October 2011. All times GMT Please go to http://www.bbc.co.uk/worldservice/schedules/frequencies/aspac.htm for bigger image.
VOA Broadcast Frequency Schedules Effective 0800 UTC, 27 March 2011 through 0800 UTC, 30 October 2011 Notes: All times and dates are Coordinated Universal Time (UTC), same as Greenwich Mean…
Transmission Line Calc allows you to perform several calculations related to RF transmission Lines. After selecting from one of 29 different transmission lines, you specify the length and operating frequency.…
Field Strength Calc helps you determine the received strength of a transmitted signal. Enter in the transmitter power, antenna gains, distance, and frequency, and the following are calculated: * Field…
The ARISS program is a cooperative venture of NASA, the ARRL and AMSAT and other international space agencies that organizes scheduled contacts via Amateur Radio between astronauts and cosmonauts aboard…
AMSAT is a name for amateur radio satellite organizations worldwide, but in particular the Radio Amateur Satellite Corporation (AMSAT-NA) with headquarters at Silver Spring, Maryland, near Washington DC. AMSAT organizations…