Mainly for John, but others please chime in.
Mainly for John, but others please chime in.
The 1710 frequency is available on virtually all modern car radios, and it is dead clear in my area, sounds the same night or day, very quiet, nothing there.
It would be perfect, but the problem is that under Part 15, you must attenuate your signal, which will kill the range, will it not? So, how do you get around this restriction at the Dade City station?
I run 100 mW and I don’t worry about it. The Rangemaster I use is certified at 1710. The FCC is 30 miles south of here. One FCC agent's opinion is, the certified transmitter is compliant and splitting hairs over 50KHZ with no interference complaint, is a total waste of his time, given the amount of FM pirate activity here in Florida. Your mileage may vary. 🙂
Makes sense to me. The people who have serious gear (CenturyTel, Emergency Services, Ferry System, Friday Harbor Airport, U.S. Customs, etc.) all have it professionally installed per engineering specs and filed with FCC. That's it. I've never known of an FCC agent coming to the island.
Many Thanks ...
Fairly recently, the Rangemaster website has begun noting that the section of the Rules governing operating on 1710 kHz is 15.223, which allows a field strength of 15 uV/m @ 30 m; not 15.219, which allows applying 100 mW to the final stage. 15 uV/m @ 30 m is such a low field strength that it can't even be measured at medium frequiencies in an urban environment by using standard professional field strength measurement equipment. The range with the severe 15.223 limits is only in the vicinity of about 15 feet in an urban area, and somewhat longer in rural areas.
While the Rangemaster may be certified for 1710 kHz, the manufacturer does not claim (according to its website) that the applicable rule is Section 15.219, but Section 15.223, which has a very tiny (and usually unmeasurable) field strength limit.
the channels below 88 mhz.
Though I have seen field violations noting that 87.9 mhz is NOT legal to transmit on.
It is my opinion that 1710 khz should be allowed the same field strenghts as 540 to 1700 khz.
Unless your running a rig that splatters all over the bands, then I don't see how 100mW on a less than ideal antenna could cause trouble for channels above 1710 khz..
Maybe i am wrong, but I just dont see the difference when there are 10 kw transmitters on 1700 khz that are heard throughout the United States and all points in-between.
The AM BCB in my area is alive and well despite the poor soil conditions in Kentucky and propergation is incredible! Sometimes the stations west of the old Mississippi sound as loud as a local station running much less than 1 kw.
My point may be missed altogether here but in my area AM stations were started long before FM so the AM BCB is a little crowded here.
1700 khz started out as a clean channel to broadcast on but after that one station south of me started to make its presence known in my area, I have found myself hopping around the band trying to get the same range I had on 1700. 1710 looked real good to me at one point but i soon convinced myself it wasnt worth taking the risk.
But i am rambling now so i will sign off for now.
🙂
Is actually FM Channel 200. A search of the FCC Database will indeed show a station licensed to operate on that frequency.
But it's in the channel 6 TV band,
The FCC says it can be used for 10 watts or less. Also, in most cases, CH6 is gone.
A Canadian TV station operates on ch 6, out of Vancouver B.C. I bet they'd complain, or get complaints, if I were to transmit audio at 10 watts on that frequency. They're just across the border, about 30 statute miles.
The trick, if it would work, would be to use that to transmit to receivers/audio outputs plugged into Part 15 TX/antennas parked in a few places. That would certainly give good coverage, eh? 😉
Theoretically, if you powered those satellite Part 15 systems via solar/batteries, you could surely develop a telescoping antenna system with a rollout wire grid, and make them totally portable.
What say?
The FCC has agreements with Canada and Mexico. They would never assign a station that conflicted with and established broadcast staion. Cuba is the exception, but that will change under the new administartion.
With regard to CH6 TV, 87.9 or FM Channel 200, was/is a guardband frequency for the now vacated VHF CH6. CH6 operated in Orlando, but is now gone with the digital transition.
Here is a FM Broadcast on 87.9:
http://www.fcc.gov/fcc-bin/fmq?list=0&facid=62118
On Canada's Digital transition:
http://www.tvb.ca/pages/planning+for+canadas+digital+transition_htm
Hope this helps.
Oh ... see how dumb I am? I tho't you were talking about some sort of license-free thing on that freq ... otherwise, what is it about?