Total posts : 45366
“Just to note in a helpful way that Part 15 FM rules do not specify anything that would mean that the transmitter would have to be installed physically close to the transmit antenna.”
Culpa mea, Rich. Quite correct. Since with my own FM transmitter the antenna is a part of the unit, I spoke of them as a connected unit to indicate the system in general. But agreed that there is nothing mandating that certified designs might not use a feedline and etc.
Neil: I apologize if I worded things badly enough to give you the impression I was disagreeing with you on some of the points of the discussion on range. What I intended was to second your and ArtisanRadio’s points with my own thoughts and anecdotal experiences. My apologies.
I will disagree at slightly on a few points as you’ve stated them in the more recent post though..
“So we are left with the portable or home theater receivers.”
Actually, there are a wide range of possible receivers, especially if you consider used stereo equipment from the 70s and 80. Some of that is very inexpensive when encountered at yard sales of secondhand stores and some of those units have amazing reception and sound.
On the other hand I agree that the “car radio” range is mostly useless when talking about part 15 FM especially. Even if you put up a sign (like realtors do with the talking house) and someone tried to tune in, they’d be out of range within seconds or possibly before they even were *able* to tune in. It wouldn’t make much sense to think of that as a possible “listening audience”.
I will also agree that people don’t huddle around the radio in the living room like in Norman Rockwell paintings anymore.. At least not most people most of the time. But once in a blue moon I’ve seen it happen, even here in my own household. In all fairness though, my household is atypical. A radio station or mp3 player or the stereo or even someone picking up a musical instrument is more likely than the TV being on here.
Radio doesn’t hold the place it once did for news and entertainment. But lets face it, radio programming isn’t what it used to be, either.
However, on your own part15 station, it can be pretty much however you wish radio was. With some work, you can maybe make it into something you enjoy listening to more than what you can usually find on the air.
I must admit I’m not sure I quite get your point on one matter though…
“Part 15 FM is a hobby and also provides for personal use, not for broadcasting.”
I would usually think of broadcasting as one-way transmission of music and etc for entertainment purposes. That is not permitted on the Ham or CB bands (for example). But it is not prohibited on either FM or AM part 15, so far as I am aware? Now I would agree that originally, many years ago, part 15 on the AM band consisted of “phonocaster” type circuits. The history has been discussed here and elsewhere and I’ll mention that I’ve found it fascinating..
But in this time frame, units expressly designed for “one-way transmission of music and etc for entertainment purposes” have been submitted and certified and the manufactured units are available on the market. If I recall correctly, the Rangemaster (for example) has a 600 ohm balanced input? I do not recall ever seeing many phonographs that had an output of that sort. So it was obviously not designed as a phonocaster. For that matter, phonographs aren’t real common these days either. So are we saying that part 15 on the AM and FM broadcast bands should now be retired because the phonographs they may have been originally allowed for are no longer common items in homes and as such there is no reason to have something to use radio to get the signal to one’s “hi-fi?”
I don’t recall seeing any prohibition against putting together broadcast style programming (provided one does not use call letters of an actual licensed station and etc) and transmitting it via part 15 FM or AM BCB devices.
Agreed, it may not be what was originally intended by the rules back in the day. But if it was somehow utterly unacceptable to the FCC then what about the “Wild Planet Radio DJ” toy? I don’t know for sure if the “Mr Microphone” was certified, but the Wild Planet unit was and for that matter it was crystal oscillator and had a built in cassette player and microphone I believe. Rather obviously not intended strictly for playing phonograph records?
Admittedly, the range to a listener with gear likely to be able to tune in isn’t large in any case.. But if one finds that acceptable, then the hobby can include “very tiny radio stations”.
Running a very small radio station within the limits of the part 15 regulations for the AM or FM broadcast bands would be, I think, just as acceptable a use of the potentialities allowed by part 15 BCB rules as getting a Glenn Miller song from the phonograph in the den to the Hi-Fi in the living room was? In either case, it is entertainment.
Sorry to have gone so verbose Neil, and I hope I haven’t been too impossibly dense or come across as being sarcastic.. But I’m really not sure what you’re trying to say. Could you clarify please?