Rednet Cable and AnalogOutput

I'm trying to change the signal strength in a minefactory reloaded Rednet Cable. Rednet Cables only accept colored inputs. The problem i'm having is mixing analog output and bundled output. This is to get a colored output with variable redstone strength. I don't understand why it doesn't work. I checked the Rednet Cable with the Rednet Meter but the signal strength is only 15 or 0. Any help would be appreciated.

–
S=side
P=Strength of signal
C=Color of signal
–
function str(S,P,C)
redstone.setAnalogOutput(S,P)
sleep(1)
redstone.setBundledOutput(S,C)
sleep(1)
redstone.setBundledOutput(S,0)
end
str("right",13,1)

The MFR Rednet Cable's strength is not adjustable. Only vanilla Redstone is.

okay thanks

Rednet will carry the same signal it receives so if you put a piece if Redstone between your computer and the cable, analog will work up to a strength of 14. You won't be able to use the different color channels however.