fm receiver

What do you want to receive? Satellite downlinks, Ham, Repeaters? How sensitive does the receiver need to be? Tell more story.

Tom

well its for a competition where i have to dectect the origin of signal kept in a range of 1 km sq as i a begginer i really need help

You might check with Ham Radio Clubs in your area; they often do 'Hidden Transmitter' games. You could also check ARRL for radio direction finding.

Tom

consult Calicut Radio Society

VU2CME Amateur Radio and Electronics Club, Calicut Medical College, Calicut-673008.

regards, S.Ramamurthy

Google

FM freqency band range is 88 MHz - 108MHz. How it is possible?

Because "FM" has sloppily become the term for the FM broadcast band,

88 to 108MHz in North America and sometimes a slightly different range in other parts of the world.

But "FM" means Frequency Modulation, and it's a form of modulation that has nothing to do with the frequency of the transmitter. "FM" varies the frequency of the transmitter according to the modulating signal sent to it, as opposed to "AM" (which also sloppily gets used to mean the AM Broadcast Band, 540KHz to 1710KHz, or thereabouts), where the modulating signal is translated to radio frequency, and part of the output signal directly reflects the amplitude and frequency of the modulating signal.

So anywhere that one is allowed to use Frequency Modulation, it can be used.

Michael

That's the FM broadcast band - the OP wants to listen to the Amateur 2 metre band, where FM is also used.

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That's just the FM broadcast band. You can frequency-modulate any EM wave. Narrow-band FM at VHF and UHF is widely used by everyone from hams to NASA.

Yeah - NASA uses NBFM. Why? When they can send down broadcast-quality video, why can't they get audio any better than the "Order Here" box at quik-e-burger?

Thanks, Rich

At least for Shuttle orbiter communications, it's not NBFM - it's a digital PM system, which allocates only about 24-32 kbits/sec to the voice channels. See:

I would imagine that the "broadcast-quality video" transmissions are actually very seldom used; they'd be huge BW hogs, and likely mean that other data transmissions (telemetry, etc.) have to be suspended while the video transmission is going on. (If you want to put it in more cynical terms, the "live video" transmissions are for the most part for PR purposes - to give the broadcast media something to show the Ammurican Taxpayers on the evening news. They set everything else aside, send a few minutes of nice footage, and then get back to business.)

The quality level of the voice transmission was no doubt chosen to be adequate for the purpose, while not taking away too much of the channel capacity from other purposes.

Bob M.