Reading again the FCC OET Knowledge Data Base # 708832 document..
Question: Are multiple transmitters addressed in the Commission's Part 15 Rules?
| Answer: There are no specific regulations that address the use of multiple Part 15 transmitters. In 1987-1989, the Commission revised its rules for unlicensed operation (GEN Docket No. 87-389). In the original Notice of Proposed Rule Making, the Commission proposed to prohibit the use of multiple transmitters to extend coverage area. However, the final Report and Order in this proceeding did not adopt that prohibition. In paragraph 137, the Commission stated that it concurred with the comments that multiple devices should be permitted provided, the individual transmitters comply with the rules and any emission resulting from the simultaneous operation of the individual, non-coordinated transmitters complies with the rules. |
How do you interpret what the last sentence saying??..
..the Commission stated that it concurred with the comments that multiple devices should be permitted provided, the individual transmitters comply with the rules and any emission resulting from the simultaneous operation of the individual, non-coordinated transmitters complies with the rules.
What's it say??..
..provided emission resulting from the simultaneous operation of the individual, non-coordinated transmitters complies with the rules.
"provided emission resulting from the simultaneous operation of the individual, non-coordinated transmitters complies with the rules."
The emmission of the individual transmitter complies.
"provided emission resulting from the simultaneous operation of the individual, non-coordinated transmitters complies with the rules."
The emmission of the individual transmitter complies.
50-million synchronized part 15 transmitters would produce 50kW ERP.
It does say "non-coordinated" though, does that mean you can't sync your transmitters? According to Keith Hamilton you can.
Mr. Rich(F)'s Post said:
"This is a misunderstanding of my post, Carl.
"My reference to long ground conductors was made to show that not everything supported/suggested by manufacturers in their e-mails and on their websites always is agreeable with the FCC.
"The unlicensed use of several synchronous, co-located AM transmit systems could fall into this category, which might be of interest to those proposing or considering this configuration.
"That possibility, per se, has nothing to do with long ground leads."
May I be so bold to point out that the Rangemaster 1000 was certified by the governmental agency known as the Federal Communications Commission with the ability to be synchronized. Therefore by the power vested in me as a member in good standing (I think) with the ALPB, I hereby authorize the use of said transmitter provided that the combined length of each transmitter's antenna and ground lead (if used) does not exceed 3 meters or 9 feet and 10 inches for those living in California.
Some readers of this thread probably expect(ed) me to reply with technical/legal rebuttals to the comments of others following my earlier posts here.
I haven't posted such because my points already have been stated, and further explained in this thread.
As always, readers of these threads are free to believe and do as they wish, based on their own research and understanding.
It is unfortunate that you have to explain this Rich.
Kieth Hamilton is correct. You can sync multiple rangemaster transmitters.. Equally true, as Rich points out in Post 34..
"Each system by itself could be compliant with FCC §15.219, but in this configuration this composite system is radiating more power than can be provided by a single system meeting 15.219."
His statement does clearly corresponds with what is being said in the FCC bulletin, and MLR, you response ignores the rest of the sentence in that bulletin... Paraphrasing what it says..
Multiple transmitter installs are permitted, as long as each transmitter, as well as the combined output of those transmitters complies with 15.219
Correct me if I'm wrong, but is that not precisely what it is saying? I sincerely wish it weren't.
"If this becomes a thread regarding the legality of multi-transmitter installs, etc - can we move it to a new discussion so we do not confound and confuse the new guy - who seems to have a GREAT forward thinking attitude, and it would be awesome to keep him that way"
I dont agree that a discussion in this thread concerning the legality of the very way he is planning to install his transmitters should be avoided, just to keep his enthusiasm up.. it's rather deceptive.
After years of going around in circles, I've finally come to a conclusion in this hobby..
I think the whole key is to accept the limitations of part 15, and then work with what actually is, and use that to accomplish the objectives.. it can still be done, but not as gloriously as we might had originally dreamed.
The alternative is to pretend otherwise.. an possibly never get caught..
Personally, I would choose the alternative, but only if strictly a hobby venture. But if it's a business venture, then it's more prudent to accept the true realities.
Part 15 is wonderful, but it is only what it is. - I've decided to finally accept that and work the existing limitations.
I think what is being said that no matter how the arrangement the transmitters, the field cannot exceed. Of course the certified transmitters are exempt from FS measurements. Now that being said, Keith's assertion of 2 miles may well be spacing the transmitters as outlined in his tech stuff. In other words, buy and sync enough transmitters and you will get your desired range. And as in another post each transmitter MUST comply with the 3 meter rule! Then All legal.
AND, in addition to the fact that YOU CAN DO what Keith Hamilton has described (using several synched transmitters), HE HIMSELF WILL PROVIDE ADVICE AND ASSISTANCE in setting up the system, so that the customer doesn't have to use guesswork or trial and error.
I think that's true, from what I've heard.
AND, in addition to the fact that YOU CAN DO what Keith Hamilton has described (using several synched transmitters), HE HIMSELF WILL PROVIDE ADVICE AND ASSISTANCE in setting up the system, so that the customer doesn't have to use guesswork or trial and error.
I think that's true, from what I've heard.
... I think that's true, from what I've heard.
Those who "think" that something is true based on claims they have "heard" would be well served to investigate/substantiate such claims using scientific principles -- and post or link the proof of such in their rebuttal(s).
He meant it was true that Keith would come help set up your equipment and make sure it was legal. And it is true. Keith told me he would help me when the time came to set it up. Simmer down Rich.