"Phil Allison" wrote:

|

| "Phil Allison"
| |
| | The pilot and subcarrier add to the total deviation, thus forcing a slight
| | reduction of the main signal's deviation.
| |
| |** But that has no effect on " Tx range ".
|
| A reduction in main signal level causes a like increase in SNR.
|
|
|** The noise level at the receiver depends only on the *carrier's signal
|strength* at its location and then only when it has fallen below a certain
|( very low) threshold.

The noise level in relation to total carrier modulation "only depends
on Carrier's signal strength", but when L+R only gets a (major)
portion of the total modulation, the ratio between that L+R and noise
goes down.

Lets set up a receiver/meter such that a 400 cps sine 100% modulating
the transmitter (with no stereo) produces 1.0 volts on the receiver
output. Now turn on the pilot and feedn the 400 cps to L and R. 100%
modulation of the transmitter will require a 1 db reduction of the 400
cps to leave room for the pilot, and the output from the receiver will
be reduced 1 db, However, the noise in the receiver output will be
unchanged, so if we had 70 db snr in mono, we now have 69 db remaining
SNR (if the stereo garbage doesn't decrease it further).

| Therefore, for a given SNR, this effectively reduces the "TX range"
|
|
|** Nonsense.

In order to maintain a 70 db SNR, you would have to have a stronger
signal, perhaps achieved by moving closer to the transmitter. (or
buying a better receiver or a better antenna).

Phil