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Post by outbackradio on Apr 4, 2017 8:46:38 GMT -7
Here we can make suggestions and comments on what would be an agreeable antenna height for Part 15 broadcasting excluding Part 15 use for road sign advertisements and store displays. We can start with a range of 6 to 15 meters. Some folk I have talked with suggested up to 50 feet but I am pretty sure the FCC would not go with that, yet they may who knows? What we need are some ideas on the range or distance the lengths can provide which is difficult seeing you have to do some measurements and or calculations, but we can use antenna modeling softwares to see if we can obtain 3 dB over the 3 meter height antenna and make do some work that way. I use MMANA GAL and EZNEC antenna modeling software so we can do something in this regards here if you would like?
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Post by Variety 1560 AM on Apr 4, 2017 9:17:01 GMT -7
should be 15m / 49ft same as TIS systems, capacity hats, external loading coils, helically wound antennas and proper ground radials, should not count against the 15m. should be 15m from ground to antenna tip.
i would like to see the input changed from 100mW to 500mW unmodulated input but i understand practically that this may not happen but 100mW with a well designed 15m antenna should give a good small neighborhood coverage.
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Post by outbackradio on Apr 5, 2017 23:07:43 GMT -7
should be 15m / 49ft same as TIS systems, capacity hats, external loading coils, helically wound antennas and proper ground radials, should not count against the 15m. should be 15m from ground to antenna tip. i would like to see the input changed from 100mW to 500mW unmodulated input but i understand practically that this may not happen but 100mW with a well designed 15m antenna should give a good small neighborhood coverage. I'd go for that for sure. Ok anyone else?
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Post by thelegacy on Apr 9, 2017 12:34:57 GMT -7
500 mW into a 50 Ft antenna should cover 2 miles with a 60 dbu signal and at the same time one should be able to run a 50 Ft copper wire from a second floor if they live on a second floor.
Get RID of ground restrictions or allow a 50 Ft ground lead. This allows folks in apartments and high rises to run a line to the TX from their place of residence. Just some food for thought.
It takes 4 times the power to make double the range. So a Talking House transmitter would go 900 Ft instead of 600 still not that much improvement when talking about the wire antenna.
Modulation could have a limit of 100% and have a Hard Limit in the circuit to stop any over deviation in the signal.
1710 should be allowed for low powered stations as well.
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Post by thelegacy on Mar 26, 2018 16:15:59 GMT -7
I totally agree about 1710Khz. It could be a Hobby Broadcasting Frequency If you can go 1 mile with 100 mW than to double this range it would get me to the Deltaville Market with a 60DB signal and that in and of itself would make me very happy.
I think we can all agree that the wire antenna won't help perform any miracles.
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Mark
New Member
Posts: 35
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Post by Mark on Mar 26, 2018 16:50:11 GMT -7
I'd be inclined to allow more power into the same 10ft antenna with a lessening of the ground restriction as it would be kind of inconvenient to be stringing a 50foot+ antenna in an apartment and the biggest inconvenience is the ground restriction which makes it not easy to place the transmitter in the location you want. Lengthen the ground separate from the antenna to say 25ft with a 10 ft antenna and 200mW into the final should nicely cover a neighborhood. I always am conservative in my thoughts on what to try to ask for because I think...go for what you have a chance of getting, not what won't happen.
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Post by Variety 1560 AM on Apr 2, 2018 20:13:12 GMT -7
always ask for more than what you want to actually get what you want.
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Post by thelegacy on Apr 12, 2018 22:42:45 GMT -7
I've kind of thought about the same thing when it comes to do with the antenna length. If you extend the ground however that will also help you arrange. And around 200 to 400 milliwatts would be sort of a good start. I'm thinking more of a watt though. 1 watt should get you closer to the 1.5 to 2 mile range without having to install ground radials which is an important piece of information for those living in an apartment dwelling.
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