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Post by mark on Nov 22, 2017 23:39:57 GMT
I agree totally about built in rechargeable things. I want replaceable regular batteries also, for everything including MP3 players(I convert mine) As for the 1000ft rule....here we go again about more power. Talk, wishful thinking.
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Post by jimhenry2000 on Dec 1, 2017 4:03:11 GMT
I really have to admire you Part 15 FM'ers. So much work for so little range! True radiophiles!
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Post by End80 on Jan 13, 2018 16:20:52 GMT
I know I'm way late, but in response to the original question; Even the prior FCC Chief engineer John Reed said the 200ft reference is bogus (this was during his correspondence with R. Fry about 15.219 at www.radiodiscussions.com/showthread.php?540838-FCC-s-John-Reed-Co...):FCC Chief Engineer John Reed: "..Yes, I know that a Public Notice was released saying that unlicensed AM and FM transmitters have 200 feet of range. On the practical side, however, you're lucky to even get 30 feet in the FM band. I did see one experiment achieve 400 feet of range when operated in a remote area with a low background noise level and no other FM stations any where near the selected frequency, using a very sensitive FM receiver with a good antenna, and transmitting in a mono mode with 75 kHz of deviation applied to the modulation. This is why our rules do not specify a range - it's a relative term that is completely dependent on the environment. The same applies to range estimates for operation in the AM band. (That same Public Notice also incorrectly stated that you can have 50 mW ERP in the AM band and 10 uW in the FM band. The 250 uV/m at 3 m limit in the FM band translates to an ERP of 11.4 nW or 0.000,000,014 W. A field strength level of 24 uV/m at 30 m, as permitted under Section 15.209 at 1000 kHz, translates to an ERP of 10.5 nW. The non-technical author of the notice should have checked with the engineers before writing this..."
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Deleted
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Post by Deleted on Jan 13, 2018 18:45:12 GMT
Great Link from End80
End80 links to a tremendous Radio Discussions thread: "The prior FCC Chief engineer John Reed said the 200ft reference is bogus."
Not only is the first document contained in the linked thread of great interest but also the followup comments are fascinating.
Because of a pressured schedule right now I've only had time to skim through the material, but plan later to return and read with care.
I look forward to posting more comments.
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Post by thelegacy on Jan 14, 2018 5:39:58 GMT
Interesting although the NRR is no longer fighting for FM due to overcrowded band conditions forcing a lot of us to AM.
Thank God for the wiggle room we have on AM.
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