Becker in Germany, said I should try shortening the cable in 10cm increments as this can often cause a problem if the length isn't correct.
It's almost as though the length of the cable needs to be a certain multiple as a function of the wavelength. Only trial and error might solve this.
I might have mentioned on an earlier posting that I have 3 sets of co-axial cable made up, lets call them short, medium and long. The medium one gives the least amount of E10 error messages. The short one gives the error code almost immediately that it receives a signal from the radar sweep from the local airport here.
The strange thing is that it bench tests 100%, but when I rig it up at home using a 12v power supply, or on my gyro, it then gives the E10 error code (this is using the short cable)! The medium length cable worked ok at home, but in the gyro, after about 15 minutes worth of flying, it gave the error. The medium length cable so far works the best, but is not 100%. Maybe if I make a new cable up, and add or subtract 10cm form this, I might have some type of solution.