How Meni Unit Of Transmitter

Why would a transmitter have a frequency range of 79 MHz? How?

ITU Band 8: 30MHz to 300MHzVFH Very high frequency – FM Radio, TV broadcasts, and aircraft communications.It is just below the FM broadcast band of 88–108MHz. It is just possible that a conventional FM radio receiver could possibly tune somewhat below 88MHz.According to OFCOM who are the regulator of the frequency bands in the UK, the band around that frequency is dedicated as:78 – 80 MHz LAND MOBILEServices for Programme Making and Special Events are authorised to use some frequencies in this band by agreement with Ofcom.The allocation is mainly for military, any civil requirements being co-ordinated by the MoD. The use of this band by military helicopters is permitted.

How many watts is a 1kw transmitter?

Well, a transmitter is generally rated in terms of RF output power, so a 1 kilowatt transmitter will put out 1000 watts of RF power.It will consume a good deal more than 1000 watts from the power source while doing this, however.Many broadcast stations are rated in terms of ERP, or Effective Radiated Power, which is generally much higher than the actual RF power fed into the antenna. This is due to using an antenna system which is directional, and has the effect of focusing the radiated energy in a certain pattern, effectively providing a stronger signal per watt of RF input. A station rated at 1 kW ERP may only be putting out a few hundred RF watts into a high gain antenna.

A one kW radio transmitter operates at a frequency of 800 Hz. How many photons per second does it emit?

One KW is the power or energy per unit time.1000 J/s is the power.We know that, [math]E = HV[/math]. Where [math]E[/math]=energy of a single photon, [math]H[/math] = Planck ‘s constant and [math]V[/math]=frequency of the photon.Now simply equate as power = energy/sec.Suppose [math]n [/math]photons are emitted per second, then we can say-[math]Power = nHV[/math][math]n = Power/HV. [/math]Solve it for the answer.Hope that helped

Would the RF from a 138–235 MHz radio transmitter used in wildlife monitoring pose a health threat to humans?

No.While I don’t have direct experience with these, I checked some data sheets. The RF power is quite small. A typical “large mammal transmitter” may use 10–20 milliwatts, or 0.01–0.02 Watt. Smaller units have lower power, down to a microwatt or less for some intended for use with small birds.Also, the duty cycle is low, to conserve battery life. Most of the time the unit is not transmitting.US FCC guidelines for RF exposure are fairly stringent, but most VHF transmitters of 1.5 Watts or less are exempt from test requirements.Public perception of the potential dangers of RF emissions seems to me wildly exaggerated. You do not want to put your head in a microwave oven while it is operating. That is why there are shields and interlocks to prevent this. Also, in some cases tower workers are required to wear protective clothing when working near operating antennas.These are special cases. Environmental RF is not hazardous in the amounts present in typical urban settings, let alone open country.

How do I connect a car MP3 FM transmitter to a power source by USB?

The transmitter is fed from a 12V supply in the car; prying it open, you might find a fuse and a circuit board that mounts this fuse...I think this is a voltage regulating circuit, that converts this 12V to 5V, as required by USB devices. Some transmitters have an antenna wire running from the main board to this 'regulating' circuit; which might mean signal attenuation. Nevertheless, the main board is supplied by a 5V line and Ground (two wires, black and red). Should your USB power source deliver 12V, the usb cable will only use the 5V and Ground wires (no data lines); check for continuity while attaching the live wire from your power source to the tip of the transmitter, and the ground wire to either of the two metal contacts on the transmitter (Ground).The transmitter should illuminate, depending on the current you're supplying it might glow dim or too bright.Alternatively, you can run your USB cable wires straight to the transmitter's main board, at 5V obviously...if you can measure the input current while using it in the car, you would know for-sure how much current your USB source should supply... By the way, some time has passed since you asked this question, any luck?

What is an “FM exciter”?

From Wikipedia, the free encyclopedia:“Exciter may refer to: The low-power RF stages of a radio transmitter. A radio transmitter is usually part of a radio communication system which uses electromagnetic waves (radio waves) to transport information (in this case sound) over a distance.In electronics and telecommunications a transmitter or radio transmitter is an electronic device which generates a radio frequency alternating current. When a connected antenna is excited by this alternating current, the antenna emits radio waves.In addition to their use in broadcasting, transmitters are necessary component parts of many electronic devices that communicate by radio, such as cell phones, wireless computer networks, Bluetooth enabled devices, garage door openers, two-way radios in aircraft, ships, spacecraft, radar sets and navigational beacons. The term transmitter is usually limited to equipment that generates radio waves for communication purposes; or radiolocation, such as radar and navigational transmitters. Generators of radio waves for heating or industrial purposes, such as microwave ovens or diathermy equipment, are not usually called transmitters even though they often have similar circuits.The term is popularly used more specifically to refer to a broadcast transmitter, a transmitter used in broadcasting, as in FM radio transmitter or television transmitter. This usage typically includes both the transmitter proper, the antenna, and often the building it is housed in.”