Using the DTF absolute amplitude values derived from the DTF data as a replacement for return loss or as a pass/fail indicator is not recommended because there are so many variables that
affect the DTF readings including propagation velocity variation, insertion loss inaccuracies
of the complete system, stray signals, temperature variations, and mathematical limitations;
hence it is very challenging for system engineers to come up with numbers that take all of
this into consideration. Used correctly, the DTF measurement is by far the best method for
troubleshooting cable and antenna problems.