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although it seems it will only do us good on 87.9 and not all radios tune there.
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.pdf
although it seems it will only do us good on 87.9 and not all radios tune there.
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.pdf
unless i am reading it wrong we can apply 50mW to the antenna. no mention of gain or not.
i suspect in short time 87.9 would be pulled as a valid frequency for these devices to prevent people from running an unlicensed fm.
this whole thing sounds too good to be true.
the original post is over on radio info.
Total posts : 45366“although it seems it will only do us good on 87.9 and not all radios tune there.”
Most do. 87.9 is a valid frequency for licensed FM. It’s FM Channel 200.
Total posts : 45366Does the possible newly allocated space not include the low VHF TV band, channels 2 to 6? This is important because some radios, including the C Crane Plus, also allow use of 87.5 and 8.7
Also, for those who have a Scosche FMT4R, an FCC certified transmitter, all 3 of the low frequencies are covered (i.e., 87.5 to 87.9).
Total posts : 4536687.5 87.7 87.9 are in the NPRM. 50mW
Total posts : 45366When I go to the link I get about 100 pages but a quick scan did not turn up what you are talking about.. Welcome back part15.us!
Total posts : 45366The document is long, over 100 pages, and as I recall it doesn’t mention frequencies in the 87 mHz range, instead it refers to the bulk of the lower VHF-TV band up to the edge of the FM band.
For me, I would say that only those frequencies near the FM band are of interest, even though frequencies below that may also become part 15 usable.
Total posts : 45366I haven’t read anything about Part-15 Broadcasting. It’s all about wireless microphones and future usage of the old TV frequencies with the new digital technology in mind.
The only thing I read concerning Part-15 is limiting the power output of unlicenced devices to 25 mW. Licenced users of wireless mics will be able to use 50 mW.
http://files.ctia.org/pdf/filings/100301_-_FILED_CTIA_Wireless_Mics_FNPRM_Comments.pdf
Total posts : 45366First of all, welcome back, everybody! I know you guys that
run this site work very hard to keep it going. We all certainly
understand that these unforeseen problems can occur.Even though I haven’t been on here as much lately, I sure
appreciate this site. It’s nice to be part of something.OK. Now on to this wireless mike thing.
I had a friend look at the 100 plus page document. Here are
a few comments. We would mainly be interested in the
high end of TV channel 6. 87.9 MHz is licensed to one or
two stations in the U.S. and yup, 87.9 is referred to as
channel 200. I think many FM radios get 87.9. I have
seen some radios that do receive 87.7. 87.5 is another
matter. I have seen some radios that tune there (we are
talking about radios with digital readouts, not the analog
ones) but many digital readout radios do not, I think.
The tuning of the analog radios is anybody’s guess.There may be a 50 mW power level involved here, but
the antenna has not been mentioned. All the wireless
mikes I have seen, (hand held and the kind that are
attached to the user,) seem to have small wire antennas
that are permanently attached to the unit.There seems to be a mention that the wireless device
would be able to have an external audio input. The
document had a specific name for what this device
would be called,
but I don’t remember what it was. Anyway, if
this is correct, then transmitting music from an external
source would be OK, I think. (???)There was a mention of interference to TV stations.
There were some kind of specs there. We, of course,
would be interested in the TV channel 6 allocation.
Somebody is going to have to go back and look at
that. It looks like if you have a channel 6 near you,
you would not be able to operate the device on that
channel. So FM transmitting on 87.5, 87.7, and
87.9 would not be permitted in that case. Maybe
the specs would differ for full size TV stations and
LPTVs.I wonder what the various broadcast lobbying groups
would have to say on this?Suppose by the right sequence of circumstances, this
FCC proposal became a new law, i.e., a new amendment
to part 15. Suppose a bunch of companies came out
with these devices. At first that would probably cost
a lot of money. Then maybe after a while, maybe the
prices would come down. Then they would actually
have to be type accepted and actually be useful.
(I suppose just about anything is better than 250 uV/M
@ 3 meters, though.)I have a fairly local FM station on 88.1 MHz. You would
not find me on 87.9. I would be operating lower than
that.Something else just occurred to me. These transmitters
might not even operate on the channels we are interested
in, they might be made not to go there.So I think this will be a VERY interesting proposal to watch.
If the 87.5, 87.7, 87.9 MHz aspect doesn’t work out, good
STL setups might be very helpful.I would say don’t hold your breath for this. If it works out,
great, but if it doesn’t, I will still be having fun messing
around with my Part 15 AM and shortwave transmitters and my
vintage mixing board (all long term projects.)Very best wishes to all, especially the guys who keep this site
going.Bruce, MICRO1690/1700
P.S. I believe there was a mention that these proposed devices
could be digital or analog.
Total posts : 45366I would stay away from anything below 88.1 for the time being. Given the old analog tv channels 2 thru 6 are still going through some sort of transition. There may be something workable with this or even more LPFM channels available -IF- the FM broadcast band is expanded into the old tv channels 5 and 6 region.
Bob Carter – KC4QLP – WQJK414
————————————————————-
Mid-Atlantic-Engineering-Service of Central NY
http://www.midatlanticengineeringservice.com/1067 FM The Vibe, Part 15 radio Ilion NY
http://www.1067thevibe.bizz.cc/
Total posts : 45366I have read some of the recent NOUO’s and there have been operators shut down for excessive power (above part 15 limits) and transmitting on 87.9 mhz.
In the NOUO it was stated as such:Radio stations must be licensed by the FCC pursuant to 47 U.S.C. S: 301.
The only exception to this licensing requirement is for certain
transmitters using or operating at a power level or mode of operation that
complies with the standards established in Part 15 of the Commission’s
rules, 47 C.F.R. S:S: 15.1 et seq. Operation of a broadcast station on
87.9 MHz, however, is not authorized at any field strength level. See 47
C.F.R. S:15.209(a). Thus, this station is operating in violation of 47
U.S.C. S: 301.Perhaps the shut downs were more of a field strength issue rather than what frequency they were broadcasting on, but it seems odd that they would mention this now, while in the past this was never really a issue. Exception being Pirate Cat Radio Cafe, it seems the mention of operating on 87.9 did not become a problem until after the f.c.c. busted them after 13 long years on the airwaves.
Still, i feel it would be a great addition to part 15 if the f.c.c. did open up these channels. Even my Sony Walkman and GM car stereo’s work down there.
Btw, it’s great to see Part15.us back online again, oh how i have missed you. Cheers.
Total posts : 45366I decided to examine FCC 10-16, the .pdf file linked at the beginning of this thread.
The document as it appears on my computer seems to have editing errors that leave uncertainty.
The Table of Contents refers to 152 total pages, of which Page 109 is titled “Unlicensed Operation under Part 15.”
But the document before me only has 103 total pages.
Total posts : 45366page 91
Total posts : 45366“I have read some of the recent NOUO’s and there have been operators shut down for excessive power (above part 15 limits) and transmitting on 87.9 mhz. In the NOUO it was stated as such:”
100 uV/M @ 3 meters
Total posts : 45366Hi John at Dade City Radio
I think you are correct that the status quo excludes using those lower frequencies for Part 15.
I’m viewing the document referenced above as a discussion of proposed rule changes, and if I’m right about that, the changes we want may or may not ever happen.
Total posts : 45366The Table of Contents mentions 152 Paragraph #’s, not Page #’s. Sorry. Not used to that. But then they ultimately reach 171 Paragraphs, so….
And, John Dade City Radio gave the correct Page number (91) where a very definite reference is made to a “Part 15 intentional radiator capable of transmitting voice, music or other audio,” and mentions the frequencies we’ve been discussing.
I’m standing clear before confusion comes back.
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