No insult taken, you discuss and argue very well!

Part of the problem with all of this IMHO is that we are applying 72mhz "thinking" into our analogies, and the analogies do not exactly reflect what is actually going on....

-

In your example you mention "mini-lanes" and the need to move left or right.

This is effectively not necessary... the data is streaming to the receiver across multiple lanes at the same time. The transmitter does not need to move it's center frequency, rather the receiver listens to a band of frequencies only paying attention to valid data coming to it in a somewhat ( and I hope I don't get into hot water with this... ) parallelized manner... maybe redundant would be a better term.

As per the web site you cited said...

"In radio terms, a single (or even quite a few) other transmissions won't have much effect on your RC system because they'll only block a tiny amount of the signal being sent. In fact, unless the freeway is almost completely blocked, at least some of the signal from your transmitter will get through to deliver your control inputs to the receiver. "

So the TX/RX go looking for available "bands" around a free center channel at power up.

Due to the digital nature of the transmission it is indeed possible to have two adjacent "channels" in use, but under normal circumstances the receivers will not care as they will only listen to their assigned transmitters....

"Well because DSSS spreads your troops so thinly across the battlefield, there's plenty of room for another platoon from a totally different army to run between the ranks without the two colliding. This is why multiple DSSS systems can co-exist on the same channel without interfering. "

In the case of DSS/DSM it is a broad "band" of frequencies in use.


FHSS uses a BAND that the carrier signal frequency hops around in.


"The overall bandwidth required for frequency hopping is much wider than that required to transmit the same information using only one carrier frequency. However, because transmission occurs only on a small portion of this bandwidth at any given time, the effective interference bandwidth is really the same.

Whilst providing NO extra protection against wideband thermal noise, the frequency-hopping approach does reduce the degradation caused by narrowband interferers."


In other words, in FHSS technology you have a narrowband signal that is constantly changing carrier frequencies within a wide band.

Whereas in DSS you have a wideband signal that is transmitting in multiple frequencies within a wide band.