Perhaps this will help compare FM to Phase modulation
as I remember it in collge
http://www.musicdsp.org/showone.php?id=160


--
CL -- I doubt, therefore I might be !






WB6RXG wrote in message ...
I don't know but I would suspect it is simply design considerations by
the design engineers.

WB6RXG

On Fri, 11 Nov 2005 00:50:45 GMT, "Falky foo"
wrote:

Thanks! Any idea why the different radios use different modulations?



WB6RXG wrote in message ...
The modulation type won't cause this as you wouldn't be able to tell
the difference in a reciever. Phase Modulation and FM Modulation with
75 uS pre-emphasis sound exactly the same. 75uSeconds is the time
constant of the RC network in the FM microphone audio circuit.

It's likely a difference in the receiver sections or antennas.

Stuart
WB6RXG

On Thu, 10 Nov 2005 01:40:12 GMT, "Falky foo"
wrote:

Hi, I have a Yaesu/Vertex VX-150 & VX-6R. Was looking at the manuals
the
other day and noticed the different emission types. Essentially the
150
uses Phase modulation (G3E) and the 6R uses FM (F3E).

Will there be any appreciable difference in the performance of these
radios
because of this?

I have noticed that, using an interchangeable antenna, the 6R has a
greater
range than the 150, even though they're both supposedly putting out 5
watts.
Could the different emission types be the cause of this?