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Old 04-29-2005, 01:52 AM   #1
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Default is am radio going obsolete?

hi. we all know the difference between an am and an fm radio. but what i want to "read" from you guys is..... AM going obsolete?
if il be racing, will am be of no use nowadays or in the future? if il buy an am radio now, consider a jr xr2i, how long will i be "holding" onto it. needing spome insights guys.. m no expert but m very willing to learn. tnx.
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Old 04-29-2005, 02:10 AM   #2
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Default Re: is am radio going obsolete?

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Originally posted by kid skid
hi. we all know the difference between an am and an fm radio. but what i want to "read" from you guys is..... AM going obsolete?
if il be racing, will am be of no use nowadays or in the future? if il buy an am radio now, consider a jr xr2i, how long will i be "holding" onto it. needing spome insights guys.. m no expert but m very willing to learn. tnx.
as long as they keep making rtr kits to suit the beginner, i dought this would happen within the immediate future. sure fm is a better system but not everybody can afford it. plus most of the fm radio's can be quite confusing to the beginner. having said this though fm radio's for competition is the way to go.
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Old 04-29-2005, 06:18 AM   #3
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An entry level FM radio is not that much more than an AM radio. From experience, spend the money on a decent radio first (it will save you money in the long run). The only feature you really want to look for is the number of model memory it has (3 to 10 is good). If it has model memory it will have all the features you will eventually need if you start racing (even if you don't know what they all do yet).

A JR XR3i would be your best choice, it's about 130 to 140 and it has everything you need.
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Old 04-29-2005, 07:08 AM   #4
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Airtronics makes a MX-3A which is am also .
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Old 04-29-2005, 08:00 AM   #5
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AM has been obsolete for years.
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Old 04-29-2005, 11:03 AM   #6
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I second that.. just like am radio stations
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Old 04-29-2005, 11:27 AM   #7
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AM (from what I've heard) is actually a cleaner freq. I've been to tracks where FM radios will glitch but AM will not.

Never experienced this first hand, but i've seen it and been told that by others.

E

So I'd say no.
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Old 04-29-2005, 12:39 PM   #8
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ive heard that as well... from a radio DJ.

which is strange because all the AM stations sound like crap compared to FM
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Old 04-29-2005, 12:41 PM   #9
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AM radio is more easily glitched. AM radio waves bounce off of things more easily and that is one reason why AM radio usually travels farther. When it bounces, the signal can degrade somewhat. FM is basically line of sight, with a higher quality signal. I am leaving out some stuff, and I am no expert, but I have seen basic explanations showing AM bouncing off of clouds etc in order to extend the range of the transmission whereas FM just stops.

Either way, don't buy an AM radio.
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Old 04-29-2005, 12:44 PM   #10
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AM (amplitude modulation) relies on the height of the wave to set the frequency, while FM (Frequency Modulation) varies the frequency by chanching the number of "Peaks and Valleys" between each wave length. Because of this, there's a larger gap for there to be interference in FM. At least that's what I remember from my electronics courses while staring at oscilloscopes...

If you buy cheap, you buy twice and end up spending 3 times the money. If you can afford a couple extra bucks, definately go FM. You can get a good computer radio from HiTec, the SRX, for around $100 with 10 model memory!
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Old 04-29-2005, 08:22 PM   #11
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i think am goes through walls but fm doesnt? personally i use am and not so much trouble. unless im really close to a high power transmitter of another fellow racer. id upgrade, whenever i have the spare money.
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Old 04-29-2005, 08:53 PM   #12
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AM is Amplitude Modulation, where the signal varies its strength to encode information, FM is Frequency Modulation where the frequency is varied to encode information. Because the signal strength can be effected by many things, it makes AM have a lot more noise.
The high-output power FM R/C radios can really effect AM systems.

Broadcast AM Radio goes farther than FM because it operates at a lower frequency, i.e. 1140KHz (1.14Mhz) verses FM Radio at say 98.6Mhz.
For R/C Radios, both AM and FM operate at the same frequency, 75Mhz, and basically I would say nobody uses AM for racing because it glitches in the presence of FM radios.

The good news, just to get a commercial plug in, is that we have a 2.4Ghz Upgrade kit for AM radios.
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Old 04-29-2005, 08:55 PM   #13
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Don't buy an AM radio. But if your RTR comes with a computer style AM, then there is no need to upgrade right away.

Logically, FM would be a more clear signal since most musical stations use FM, and the talk shows use AM b/c the clarity is not as neccessary. And I you can listen to stations on AM that are much further away than FM stations.
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Old 04-29-2005, 09:51 PM   #14
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yo guys thanks a lot. hope you wont ever get tired sharing what you know.
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