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Old 07-11-2005, 12:08 AM   #1
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Default AM and FM - Whats the difference?

The title says it, please explain to me what the difference is and what the pros and cons are of each.

Thankyou
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Old 07-11-2005, 12:27 AM   #2
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The technical difference.

AM=amplitude modulation
FM= Frequency Modulation


The real difference.

AM=More vulnerable to glitching-costs less-cant go synthesized
FM=More reliable signal-costs a bit more-potential to be synthesized or move to DSM.

Most FM radios come with more tuning options. I recently switched to FM from AM (Airtonics blazer sport to JR XS3) Easily one of the 3 best investments I've made in this hobby. Cahsing an elusive glitch can be such a pain. I haven't had a single problem yet with my new radio.

my $.02
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Old 07-11-2005, 12:34 AM   #3
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AM=Amplitude Modulation
FM=Frequency Modulation

I'm not a techno geek,but I'll give all out from understanding.

AM can tranmit a further distance than FM,but its more prone to glitches or noise interference.And its cheaper than FM.

FM is a more popular choice of racers.As it is less prone to glitches and the area we run our cars is more then enough for the range.But its more expensive.

Maybe someone with more technical know how can add on for me.Thanks.

But if you're getting a radio,I recommand FM radios,if you're going to race in the near future(more advance radios only comes in FM,unless there's a AM convertion for it)
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Old 07-11-2005, 01:00 AM   #4
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With AM, differences in the amplitude of the radio wave tell your car what to do. With FM, it is changes in the frequency. The amplitude of a wave is basically its strength, and with a radio signal, it's much easier for interference to mess up the amplitude than the frequency, hence more glitching.
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Old 07-11-2005, 01:02 AM   #5
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Am hugs the ground better than Fm, giving the car a better radio signal for the reciever to hear....
Thats why you can hear am radio stations from futher distances compared to the fm stations...
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Old 07-11-2005, 01:10 AM   #6
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Alright, thanks for the quick replies.Sounds like FM is definetely the way to go

Cheers
Sean
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Old 07-11-2005, 01:12 AM   #7
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pcm is better as well.. im not sold on the spectrum yet, but most like it.. still a few that do not..well see
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Old 07-11-2005, 03:32 AM   #8
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Quote:
Originally Posted by burbs
pcm is better as well.. im not sold on the spectrum yet, but most like it.. still a few that do not..well see

By the way,PCM= pulse code modulation.

This is said better than FM.But its more expensive,in terms of crystals and receivers.Thats why FM is still the choice of most racers.Besides I think Futaba offers PCM on their car radios.

The spektrum is a 'new' technology in RC. Using an ultra high frequency.Spektrum has their own radio.If you planning of getting other FM radios,the spektrum module and reciever can be purchased seperately.But its expensive.

I believe you're a beginner.So I suggest to get a relatively good FM radio.At least the radio can grow with you.Unlike if you buy cheap AM radio,you will grow out of it quite fast....
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