Didn't do detailed analysis.. just realized that the VX-6 was hitting
repeaters better than the VX-150, even when using the same antenna.
Wondered if that difference was because of the different modulation types.


When you say Range what exactly are you talking about?
Range is a combination of transmit power, receiver sensitivity and
propagation path.

Do you know what power the radios are putting out
Did you measure there output?
Do you know the receiver Sensitivity for these particular radios?

Published specs are for comparison only, actual production radios will
differ from published specs by significant amounts.

--
Korbin Dallas
The name was changed to protect the guilty.