----- Original Message ----- From: "Bill Swingle" <[EMAIL PROTECTED]> > > >>So, if I get the gist of this right, why don't we all use AM instead? > That is a good question. The simple answer is that FM sounds "better" to > the average pilot. Thus the market spoke its preference. Manufacturers > build accordingly and there aren't many Tx's on AM. Certainly not the > models that we're interested in purchasing.
Mightn't it also have to do with the fact that FM might (I don't have any experience to verify this, just theory :O) ) have slightly better range under noisy conditions? My reasoning goes like this... With AM, the pulses are a series of ONs and OFFs. Thus, with the very low level signals present at near maximum range, it becomes very hard to distinguish a true ON from spurious background noise, and a true OFF may be hidden by background noise. With FM, on the other hand, the pulses are sent by sending an ON on one frequency and an OFF on another. Thus, even with the very low signal levels at near maximum range, as long as the ON frequency can be distinguished from the background noise, its level doesn't matter. Ditto for the OFF frequency. Faulty logic, or semi-valid reason? - Robert RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
