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Why are ferrite bar antennas often used for the AM band while whip antennas are often used for the FM band?
The ideal length for a simple antenna is approximately 1/2 of a wavelength. At VHF FM frequencies this will be about than 1.5m long. On the AM band, a much longer whip antenna will be required (100m+). Not very practical. The ferrite rod is placed inside a coil of wire producing a simple loop antenna with the ferrite helping to intensify its magnetic properties producing a relatively compact antenna solution.
What else can I help you with?
Why the antenna of radio are vertical?
Not all radio antennas are vertical.The main reason radio antennas tend to be vertical is convenience of mounting. Many early radio antennas were long horizontal wires strung between two poles or trees. This was also a matter of convenience in mounting such a long antenna (e.g. 50 feet to 100 feet in length).When you are operating radios in the VHF or UHF band a vertical or horizontal mounting of the short antennas used at these frequencies might be selected to improve reception of a polarized radio signal sent by the transmitter.
Does bluegrass music use a ukulele?
While it is not often seen in a bluegrass band, they can be used. It was more common in the 1930's than it is now.
Did Duke Ellington have family in his band?
Yes, he had his son, Mercer, in the band with him for a while.
Is Kjwan a Christian band?
Kjwan is a Filipino rock band known for their diverse musical style and influences, which include alternative rock and pop. While their lyrics often explore themes that can resonate with spiritual and introspective ideas, the band does not explicitly identify as a Christian band. Their music appeals to a wide audience, transcending specific religious affiliations.
Is Within Temptation a pagan band?
No. While Sharon and her husband have both stated they are christians the band however isn't. While many of their lyrics contains referances to their faith they are still not a christian band.
Why do some trucks have big antennas?
They use Citizens' Band Radio (CB) to communicate with other truckers on the road. The long antennas give them better reception and transmission.
Would dual band 802.11n antennas limit the functionality of the Intel 7260 wireless ac adapter If not where can compatible antennas be found?
A dual band 802.11n antenna should not limit the functionality of the Intel 7260 Wireless AC Adapater. This is considered to be compatible.
What has the author David E Hicks written?
David E. Hicks has written: 'CB radio antennas' -- subject(s): Antennas, Citizens band radio 'CB radio installation handbook' -- subject(s): Citizens band radio 'Citizens band radio handbook' -- subject(s): Citizens band radio 'Realistic guide to CB radio' -- subject(s): Citizens band radio 'CB radio operating procedures' -- subject(s): Citizens band radio
What has the author Lon Cantor written?
Lon Cantor has written: 'Planning and installing master antenna TV systems' 'What Makes America Great' 'How to select and install antennas' -- subject(s): Antennas, Citizens band radio, Television
What is the need for antennas what are transmitting antennas what are receiving antennas?
Antennas transfer energy from a cable into the airwaves efficiently. Any transmit antenna can also be a receive antenna and viceversa. If you wish to transmit high power from an antenna, usually heat generation or high voltage is a concern that can destroy the antenna. To prevent problems, high power antennas require thicker wires and sometimes insulators to prevent overheating/burning and arcing. Many antennas can simply be made of wire of a simple length and they'll be very efficient. The length of an antenna changes it's efficiency to the cable. If you want the antenna to be efficient, you must size it to match the cable impedance. Usually the length of a single wire exiting above a metal plate is one quarter wavelength or 1/4 x 11,803/frequency in megahertz. For FM radio on an automobile, some antennas have motors that extend out of the body of the car. The height (inches) should be 1/4 x 11,803/100 megahertz or just under 30 inches. TV antennas above a house are most often a set of half wavelength wires, so change the 1/4 to 1/2 in the formula above. They use many different wire lengths to cover all the frequencies in the television band, which extends from about 50 megahertz to around 600 megahertz. Cell phone frequencies were picked partly to make the antennas small and partly so that cell phone reception can enter buildings with rebar reinforcement. Cell phone frequencies are roughly 800 megahertz and 1800 megahertz. Receiver antennas are often made smaller than either transmit or transceiver antennas. If you open up the back of an older transistor radio, you are likely to find a bar made of ferrite material with an insulator and wire wrapped around that. The wire is wrapped a number of turns to match the impedance required by the circuit. The ferrite bar is able to focus signals to itself which in turn induces a current in the coil. While impedance is an important issue, simple dipole antennas can be sized by the 468/Frequency in mHz formula. It will give the the length of an antenna in feet. You divide the outcome by 2 to find out what each side length should be. The impedance of an antenna can ofter be adjusted by its shape. The 90 degree V shape yields a near perfect 50 ohms impedance which is commonly used for transmitters and transceivers where as the flat top diode has a higher impedance. The ARRL has good books on antennas. You might want to go to the library and look at a few of them.
What kind of Antennas do Amateur Radio use high or low or microwave?
All three, and many others besides. It depends on the frequency band being worked, the amount of room you have for the antenna, the amount of money you have to spend on antennas, and the amateur's personal preference.
Which antenna is not wideband?
Electrically small antennas are always narrow-band. The bandwidth of a small antenna has a theoretical maximum defined by the Chu Limit.
When did earle dickson invent the band aids?
Earle Dickson invented Band-Aids while working for Johnson and Johnson in 1920. It seems Earle's wife, Josephine, often cut herself while cooking, so Earle invented the Band-Aid with her in mind.
Does bluegrass music use a ukulele?
While it is not often seen in a bluegrass band, they can be used. It was more common in the 1930's than it is now.
Why the antenna of radio are vertical?
Not all radio antennas are vertical.The main reason radio antennas tend to be vertical is convenience of mounting. Many early radio antennas were long horizontal wires strung between two poles or trees. This was also a matter of convenience in mounting such a long antenna (e.g. 50 feet to 100 feet in length).When you are operating radios in the VHF or UHF band a vertical or horizontal mounting of the short antennas used at these frequencies might be selected to improve reception of a polarized radio signal sent by the transmitter.
Did Duke Ellington have family in his band?
Yes, he had his son, Mercer, in the band with him for a while.
What are the release dates for While the Band Played - 1914?
While the Band Played - 1914 was released on: USA: 16 May 1914
