Total posts : 45366
Looking back to your (RFB) much appreciated comments on the nature of the art of capacitive measurement, can I safely assume that the lowest Farad reading of the otherwise varying numbers is most likely the true capacitance?
I made the measurements I wrote about after all my transmitters were turned off, but there are ballasts and so on plus maybe roving spirits in the room.
Yesterday I got so involved that I re-built my whole back-room window antenna, so any comparisons will have to start from the beginning, with the AMT3000 first, etc. And today we have rain, so not much will happen.
This entire adventure is great for Part 15 radio, and products like PhilB’s and of course this website and the wonderful members keep this hobby/profession alive and growing. As a promoter of personal radio stations I see one stubborn obstacle that discourages some people, namely the antenna.
People I’ve attempted to “convert” to Part 15 have balked at even having an inconspicuous white (or any color) wire discretely up the wall, and the other big attitude which keeps some people from adopting AM technology is a deep rooted preference for FM. I tend to align with promoting Part 15 AM, leaving the FMers on their own.
As I see it, there are three meaningful categories of Part 15 AM transmission antennas: the “Ultimate,” as described by PhilB and the true objective of the most serious operators, namely outdoor vertical with radials, but this requires locating equipment outside; the indoor antenna for the most simple approach; and my vision of an “indoor/outdoor” antenna, with my window-frame example serving as a way of accomplishing the goal of reaching the yard and inner-sanctum while keeping the transmitter inside, albeit not perfect.
This track is about the AMT5000 and only incidentally the antenna question, so I have opened a separate track titled “Indoor Antennas” with my aim of better formalizing whatever methods we can invent of integrating an indoor antenna with home decor.