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why does fones only have FM not AM? |
jattinder
Joined: Jul 21, 2005
Posts: 14
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hello can someone tell me why is that most fones have FM not AM? I think the signal of AM much better. What's the different in FM and AM?
thanks |
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Sirhackalot
Joined: Aug 10, 2004
Posts: 463
From: Bermuda, Uk
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I can't remember the details but FM has a fixed Transmission radio spectrum. But unlike the AM frequency it has a Crest and trough spectrum(or a wavey transmission method)>>..So i guess that explains why my gas plane and nitro car have a AM frequency crystal.??
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Kryptik
Joined: Jun 24, 2005
Posts: > 500
From: Port Elizabeth, S.Africa
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I think i see what you're driving at, SirH, although i'd agree that AM would be great... It'd allow me to get BBC, VOA, WRN, etc...
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whizkidd
Joined: May 14, 2004
Posts: > 500
From: India
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Isn't AM sonically inferior to FM? That might be it!?
T230 >> T610 >> Ngage QD >> N73 >> N85 >> Omnia HD >> And countless other review units |
mikeb
Joined: Nov 12, 2002
Posts: 98
From: Sweden
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Hi,
the reason is 90% economics and 10% technical.
AM = Amplitude Modulation
FM = Frequency Modulation
I won't bore you with details, except to say they are two different techniques for radio transmission. To also inlcude an AM reciever would require extra circuits (always a problem for a phone) and add extra complexity to the user interface (must be able to switch between AM & FM).
Now before you jump all over me to point out the extra curcuits & UI complexity is tiny, I know. Remember I said technical was only 10% of the reason.
The main reason is economics. All over the world, FM is the main mode of operation for commerical radio stations, mainly because it is more robust than AM (less influence from interference), thus providing a better sound reproduction. The exception is the US, where FM is the main mode in urban areas, but AM is still very popular, especially in rural areas where AM has better range than FM.
Thus SE figure it is enough to only support FM as this is good enough 90% of the time and besides, radio is a "gimmicky add-on feature" to the phone and not its main function.
Regards,
/Mike B. |
mustafabay
Joined: Sep 27, 2004
Posts: > 500
From: Egypt
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And the added circuit would make the phone quite a lot bigger. The same reason mp3 players don't have AM radios.
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siwatkins
Joined: Aug 19, 2005
Posts: 31
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It's simply down to the size of the antenna required. The broadcast wavelengths involved for AM transmissions are typically very much longer than those used for FM radio. The longer wavelengths demand bigger aerials. If you've ever taken a radio apart that has an AM receiver in it, you'll have noticed the ferrite antenna, wrapped with many turns of copper. That won't fit in a phone. |
thami
Joined: Feb 08, 2005
Posts: 169
From: UK
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They just lazy ..i cant see why they can do it becouse they have the technollogy to do it ?what els do they want im loosing it comppletly
[ This Message was edited by: thami on 2005-08-27 17:05 ] |
50Cent
Joined: Nov 08, 2003
Posts: > 500
From: ...whatever psycho!!!
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@mikeb
nice explanation 
Trusted Trader: 50Cent (+6, -0)
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defensive
Joined: Jun 23, 2005
Posts: > 500
From: Cheshire, UK Phones: K750i &
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This thread had almost disapeared but oh no, people decide to shunt it back to the top, we have heard enough explanations as to why manufacturers have put FM not AM radios in their phones.
At least it has a radio, your phone is meant to be, guess what, a phone. For calls and text, and esato via wap  not just for an mp3 player and radio and camera and videocamera, etc. Isn't that enough for you, if you think you can do better please go and create your own phone the size and weight of a ton weight then laugh. Leave the manufacturers & technology of today to develop at its own speed not at ours.
Also please let this thread have a peaceful rest and don't shunt it back to the top by asking stupid questions 
Best Regard's
Mr. Christopher Robinson
[addsig] |
thami
Joined: Feb 08, 2005
Posts: 169
From: UK
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LOL Defensive good piont |
carkitter
Joined: Apr 29, 2005
Posts: > 500
From: Auckland, NZ
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In New Orleans at present hurricane Katrina has knocked out local communications and AM radio is the only thing working. If mobile phones had AM reception, these homeless people wouldn't be wandering around confused as to where to go...
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Jools
Joined: May 21, 2003
Posts: > 500
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...assuming they've got electricity to charge up their phones...
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victorh017
Joined: Jul 24, 2005
Posts: 379
From: Caracas, Venezuela
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Well, if they are homeless probably they don't have anything but the clothes they're wearing. If there is no power, where would they charge their phones? I don't think that peopke who are trying to save their lives are gonna hold on to their cell phones and chargers.
@defensive
the hell you're right!! these are very stupid questions...
@thami
Lazy? Try fitting a ferrite antenna for AM reception into a cell phone...
 CMDJ5 > T230 > T610 > K700i > K750i > K810i > K850i > G900 RED > C905 Gold |
defensive
Joined: Jun 23, 2005
Posts: > 500
From: Cheshire, UK Phones: K750i &
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@ victorh017 - finally someone listens & reads before they type  Thanks for agreeing mate.
Also to all the others - please do as victorh017 says and try to fit an AM radio antenna into a mobile phone, then create the software needed to programme it to listen for connections and build that into the firmware of your phone  Then if you could listen out or life on another planet and report back, in say a few years time, then I would be most grateful
[addsig] |
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Posted: 2005-08-27 09:09
T68i 
