Unfortunately, the inexpensive receivers that show a signal strength value in "dBu" on their display screens are reporting only the conducted voltage...

The use of "73" in that context is a carryover from the days of using Morse code for radio communication, and was/is a shorthand way of saying "Regard...

RE: ... a rod antenna is not permitted for testing and that they must use a loop antenna... My guess is that it relates to the relative susceptibili...

The checklist referred to, as well as that whole slide presentation was prepared by the FCC for the benefit of the contractors who are hired by manufa...

RE: And Carl completes the rebuttal. Not for me -- see post 109878 above.

RE: ... The bottom line is that if you are using an FCC certified Part 15 transmitter, or you are technically competent and can prove that the non ce...

RE: ... if you are using an FCC certified Part 15 transmitter... you really have nothing to worry about. ... A gentle reminder: even transmitters ...

RE: “So, for example, if the d-c input power to an r-f amplifier stage is 100 mW, the r-f input power to it is 2.5 mW, etc." That is a big help, tha...

Followup: below are calculations for a ~typical, legal Part 15 AM system...

There appears be some general confusion concerning the meaning of the term "input power" as it applies to an r-f amplifier. It is not the r-f input p...

True, for posters other than radio8z and yours truly. In my case, physical measurements have been posted several times in this thread (see the graphi...

Suggest that posts based on provable data such as shown in antenna engineering textbooks and other peer-reviewed publications, and/or by accurate phys...

RE: ... I came across this article which illustrates what I was attempting to say far more eloquently: etc ... My observation: attempting to shift t...