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Post by mark on Mar 9, 2018 6:54:10 GMT
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Deleted
Deleted Member
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Post by Deleted on Mar 10, 2018 23:59:25 GMT
Nice Flick
Good find, Mark. I watched it and enjoyed how well the differences between signal propagation on AM vs. FM were explained.
I have said before that our low power stations should be allowed to RAISE power at night since we are too small to cause a skywave and deserve a chance to regain something of our daytime coverage.
I read somewhere that it takes at least 20 Watts to reach the ionosphere and our small signals would cause no harm with about 10 Watts at night.
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Post by Boomer on Mar 11, 2018 4:03:38 GMT
It's new how videos are appearing right in the pages now, instead of being links, must be an update somewhere along the line.
I get a picture of how running lower power at night shouldn't be much of an issue, with Tourist Information Stations that are on the air. They're around 10 watts transmitter output, and can be heard for a few hundred miles under good radio conditions, but at any distance outside of their main coverage, they're always close to the noise level, true DX here. It's such a low distant signal I can't see it having an impact on any broadcaster.
By day, a TIS station reaches from a mile to maybe 5 miles max listenable range. At night on a regional channel used by others the distance drops to half a mile to a mile of listenable radius. It's like the TIS is carving out its own cozy listening radius in the cluttered airwaves at night, and it's rapidly lost to the noise outside of that area.
I've seen a few reports of people hearing Part-15 AM stations at skip distances, but that seems to be pretty rare.
Boomer
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Post by mark on Mar 11, 2018 4:17:47 GMT
Nice FlickGood find, Mark. I watched it and enjoyed how well the differences between signal propagation on AM vs. FM were explained. I have said before that our low power stations should be allowed to RAISE power at night since we are too small to cause a skywave and deserve a chance to regain something of our daytime coverage. I read somewhere that it takes at least 20 Watts to reach the ionosphere and our small signals would cause no harm with about 10 Watts at night. Agree fully! But 10 watts? Maybe a little much. Maybe from 100mW to 2 watts would overcome the nightime clutter and give you the daytime coverage with maybe a little background hash from the other stations. But this most likely won't ever be and you would need the transmitter to have a "nightime" power setting. Maybe something to petition the FCC about? |
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