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Old 02-13-2005, 09:53 PM   #11
Gary Maker
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Argus wrote: "there can be a interference problem with AM radio systems."

I remember back in the late 70's when my bro-in-law was flying using AM radios at his club in St Cathrines Ont. Also back then CB radios were quite popular and could cause havoic with model planes. A fellow at the club decided to chat on the CB while my bro was flying and his plane started doing crazy and wierd things all by itself until someone noticed what the cause was. In very short order, the use of CB's at the club was banned!

From what I understand, at least back then, AM radios were quite suseptable to all kinds of outside interferance!
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Old 02-14-2005, 10:02 AM   #12
Dave Holmes
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Boy, I can see that happening, Gary! The technology in the CB radios back then wasn't that sophisticated, and they were prone to "splash over" onto other bands, plus the receivers in use probably were not as capable of rejecting spurious signals, and add in the fact the CB transmitter radiates several times the power of the RC transmitter, it could litterally swamp an RC Rx.

Also, there is a phenomenon known as "Desensitization" that occurs in receivers if there is a nearby source of RF energy. The Automatic Gain Control can kick in due to the strength of signal received, even though it is outside th band being "listened to", and the Rx efectively "turns the volume control down" on all incoming signals., so the desired signal is reduced as well. Causes all kinds of problems in certain communications scenarios.

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Old 03-09-2005, 09:37 PM   #13
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Just to clarify something. Not all Futaba Attack 4 is AM.

I have a ATTACK 4 which is FM the 72Mhz. I am surprise why not many people know this. Maybe mine was a later version of the attack 4's ??
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Old 03-09-2005, 10:28 PM   #14
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Ultimately it does not really matter if they come on 72 Mhz or not....all that matters is if they are '91 narrow band approved....if not you cant use it.

Well of course you can use it, but its a really bad idea.

Here you go...
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