RF module for spectrum?

[erhard52]

The range test with any v3.x modules is done with the antenna always ON.  Only the very early 1.x/2.x modules up to about 2007) did the range test with the antenna OFF.  Look at the LED on the transmitter module when you turn on the transmitter.  Once connected to the receiver the LED will flicker it is is a v3.x module.  Otherwise the LED will be solid green.

Paul
ok both of my modules flicker green when connected - so no antenna removal. thanks a lot for this information. where did you find that one?
so the next question then could: " are my modules no damaged because i too the antenna off?
how to know and potentially fix it. 
i wish RF power measurement would not be so difficult. 
there should be a test mode that turns the hopping off for that purpose then i would have a better chance to measure RF power.
the tx16s also has a built in spectrum analyzer but there i also do not see a useable difference when i power any other transmitter on or off

erhard