Radio was not invented by any single person, but instead was a culmination of several scientists' research, each of whom pioneered a different area of electromagnetic radiation and radio waves during the late 1800s and early 1900s. Among these men are well known researchers such as Heinrich Rudolf Hertz, James Clerk Maxwell, David E. Hughes, Thomas Edison, and Nikola Tesla.The Role of James Clerk Maxwell
In order to fully understand the invention of radio, we must go back to an earlier point...
|
|
Read more...
|
Fixed Radio Scanners
My recommendations for general purpose radios for scanning are the PC controlled models.
PC controllers scanning radios give you many more options for playing and are a great bang for your scanning buck. The only downside is that you can't carry these radios around on your belt!Icom PCR-1000WinRadioMobile Radio Scanners
To scan while walking around, I recommend either the Uniden BC250D Trunked Radio Scanner, which will enable you to listen to trunked radio, or the Yaesu...
|
|
Read more...
|
Traditional radio equipment works because all parties involved in the communication agree on what frequencies they will utilize. Traditional radio scanners work by scanning for and then listening to those frequencies.
Trunking radios, on the other hand, constantly renegotiate the frequencies utilized for the conversation. This allows for more efficient utilization of limited frequencies because each conversation does not require a dedicated channel. However, it also makes it very difficult...
|
|
Read more...
|
All radio spectrum is legislated or controlled. The FCC requires licenses to operate on some bands, and lets other frequency bands run unlicensed.Radio Services Which Require a License
Some of the licensed radio services include: Acronym Full Name URL HAM Amateur http://wireless.fcc.gov/services/amateur/ GMRS General Mobile Radio Service http://wireless.fcc.gov/services/personal/generalmobile/ Radio Services Which Do Not Require a License
Some of the unlicensed radio services...
|
|
Read more...
|
HD Radio offers a new and better way to broadcast radio programs. The "HD" in HD radio is a trademarked brand name that's given by its developer and that doesn't stand for anything. HD Radio technology is developed without any intention to replace traditional FM and AM radio broadcast. HD Radio is currently being broadcast along with conventional FM and AM signals.
The main difference of HD Radio compared to Amplitude Modulation (AM) and Frequency Modulation (FM) is the form of signal...
|
|
Read more...
|
|
The best of these radios can be extensively modified by end users. These modifications usually allow greater receive or transmit ranges, but may enable access to an array of possible features.
The absolute best source for radio mod information is http://www.mods.dk
A Yaesu specific modding page is at http://www.icongrp.com/~sllewd/ |
Pirate radio is broadcasting outside of the rules laid down by theFederal Communications Commission (FCC). Pirate radio usually occurs onthe FM band because that is where the most receivers are.
Under Part 15 of the FCC rules, you can legally broadcast on the FM bandif you broadcast using less that 100 milliwatts of output power and andantenna less than 3' long. In contrast, commercial FM broadcasters arerequired to broadcast using at least 100 watts of output power. 100milliwatts will...
|
|
Read more...
|
The Federal Communications Commission (FCC) licenses the frequency spectrum in the United States.
Useful charts showing frequency allocations are available from the National Telecommunications and Information Administration (NTIA) at http://www.ntia.doc.gov/osmhome/allochrt.html.
This table shows commonly used names for various frequency ranges:FrequencyDescription30 - 300 GHzExtremely High Frequency3 - 30 GHzSuper High Frequency300 MHz - 3 GHzUltra High Frequency (UHF)30 - 300 MHzVery High...
|
|
Read more...
|
RFID (Radio Frequency IDentification) is a wireless system used to identify tags. These tags may be carried by people or animals or mounted on object or vehicles. They may even be embedded under the skin.
RFID tags are non-contact and non-line-of-sight. This means that you don't have to "swipe" your card for an RFID system to identify you.Passive RFID vs. Active RFID
Passive RFID tags operate using power from the RFID transceiver. Passive tags are small and inexpensive, but do not have...
|
|
Read more...
|
CB (Citizens Band) Radio is an unlicensed service. CB Radio consists of 40 HF channels on AM and SSB. Channel 9 is designated for emergencies and assistance.
The maximum allowable power for a CB radio is 5 watts. Repeaters are not allowed on CB radio.CB Radio Usage
CB Radio is mainly utilized by truck drivers. CB radio is known for the colorful language utilized by its adherents, such as "10-4 good buddy".CB Radio...
|
|
Read more...
|
|
|
<< Start < Prev 1 2 3 4 5 6 7 Next > End >>
|
|
Page 1 of 7 |
Re:What email service do you use?