Total posts : 45366
(Quote jbprptco) Keith continues on his site with instructions to keep the ground wire away from all other metal, ie, use standoffs if the transmitter is on a metal mast or tower account, for, as he puts it, the ground wire needs to develop some impedence. This surely is another radiator, yet he’s been certified by the FCC.
Ironically, the impedance in the elevated “ground” conductor connection to true r-f ground actually would have better impedance bandwidth and less DC resistance if it was bonded to the metal mast or tower, instead of running down it on insulators — which would reduce its loss to the r-f current it carries.
FCC records show that the Rangemaster has been Part 15 certified, but if that certification was done with the tx+3-m whip installed on an elevated mount with a long conducting path from its chassis to a true r-f ground at the surface of the earth, then operationally Part 15.219(b) was not being observed.
If it was certified with the tx+whip near ground level, and with a very short conductor to true r-f ground so that the length of the total did not exceed 3 meters, then installing it on an elevated mount with a long conductor to r-f ground is not covered by the certification on file.
Using a certified Part 15 AM tx doesn’t mean that every installation of it automatically is Part 15 compliant. It still can be used in illegal ways.