Hi:

Most cell phones and wireless internet routers, modems, and access
points that use spread spectrum usually broadcast and receive their data
on FM-radio waves. Just out of curiosity, I ask, why not use AM?

Let's say a DSSS/FHSS type of spread-spectrum is transmitted and
received using the AM radio waves in the UHF spectrum [i.e. spread info
for transmission throughout the UHF band and receive AM radio waves
throughout all UHF frequencies]. What would be the disadvantages of this?

Normally DSSS and FHSS are transmitted/received on FM radio waves. So I
ask what would be the disadvantages of using AM instead of FM for this?

AM radio tends to be more vulnerable to unwanted magnetic disruptions
than FM, however this only affects analog reception. Digital reception
on AM should be unaffected even by the strongest-interfering analog RF
magnetic signal. Right?


Thanks,

Radium