Meaning of the colors on waterfall when watching my own transmission ?

F4HPX

When activated I see my transmission on waterfall as well - that's great for monitoring
I was wondering if the colors from blue to red are reflecting the strength of my signal
and then why on some lower bands are quite blue/weak and higher green/yellow/orange?

Is that measure my output power? Antenna actual radiation quality ? Anything else ?

73, Thomas de F4HPX  
  

DH2ID

Thomas, to make it short: No, the signal shown when transmitting is not showing tx power or signal strength, but gives an approximate idea of the shape of your tx signal.

You'll find the official response here:
https://community.flexradio.com/flexradio/topics/tx-signal-on-waterfall-accurate

But you can easily measure output power, reflected power, SWR, Voltage and
PA temperature by using FRStack and enabling the meter window.

You can download FRStack here:
http://www.mkcmsoftware.com/Flex/Index

73, Alex - DH2ID

F4HPX

OK Many thanks Alex

Al K0VM

THomas,
  The  signal you see in the WF during TX is the result of 'leakage' coupling ( mostly capacitance ) between the TX and RX.  There is less coupling on the low bands as compare to the upper bands and therefor the difference in color.  
AL, K0VM

Walt - KZ1F

I did not realize that Al. Thank you for that!