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KNBR
- Thread starter gar hi
- Start date
He meant the ERP (effective radiated power) of the signal. For instance, KTRH in Houston sends the equivalent of 200,000 watts over downtown Houston with its night pattern; I get around 100-150K ERP out here in the south suburbs. It's actually sending 50,000 watts in my direction, but because of the directional pattern more signal is squeezed out toward me.
If that's not technically correct, someone feel free to add/contradict!
If that's not technically correct, someone feel free to add/contradict!
schmave said:
Yes, that is correct. When you restrict the power or create a null in one or more directions, that power is concentrated into other directions or lobes. In physical properties energy, is not destroyed but conserved and this follows along in power flow, in the purest sense. Specifically, the field strength power is expressed in millivolts per meter and that number is the arithmetic mean (RMS or sum of averages) of the signal that is measured or calculated along as few as eight or as many as 360 equally spaced radials. As an example, one station I know of has as little as 10.0 watts in some directions but as much as 220kW in others, all averages out to 50kW though.
w/
gar fla said:
Good point, but others have told me that they've heard KGO in Hawaii. I cannot get it at all, but I get 3 other San Francisco stations,
KNBR, KTRB, and KFAX. The last 2 extremely well.
Wouldn't the KGO salt-water path count for a few points?
Especially when nothing else comes in on 810? NOTHING comes in?
The Radio-Dislocator map shows two nulls pulled back from KGO's signal into the Pacific, but once a signal stone-skips on the water, anything can happen.
Just a matter of time. Then KGO will be a pest, hi.
Especially when nothing else comes in on 810? NOTHING comes in?
The Radio-Dislocator map shows two nulls pulled back from KGO's signal into the Pacific, but once a signal stone-skips on the water, anything can happen.
Just a matter of time. Then KGO will be a pest, hi.
Speaking of reading those radio locator maps, this also reminds me of KYW Philadelphia. On a normal night, I can't hear it at all here in Tampa but there are some exceptional nights where I can get an OK signal. According to their signal map, I wouldn't call it a real "null" in my direction, however it does seem to have a rather intentional direction favoring SE/NW. http://www.radio-locator.com/cgi-bin/pat?call=KYW&service=AM&status=L&hours=U Maybe the same applies with getting KGO in Hawaii? Though it's favored in an obvious SE/NW direction, maybe the right conditions would make it possible to hear in Hawaiion those nights that are few and far between?
Steve Green NEPA said:
KGO never came into Hawaii when I tried. Not even a whisper of anything on 810 for me. There's a guy who posts here occassionally who lives in Hawaii and maybe he can answer whether he's ever received it.
If you don't mind my asking, what radio(s) and type of antenna do you use?gar fla said:
Also, when you are looking at the FCC Electric Field Strength pattern plots, be aware that they do not post plots for stations using non directional antennas. However, I believe that a 50 KW station using a non directional antenna in theory unaugmented would produce about 2300 millivolts per meter. So if you see a plot for a 50,000 watt directional station radiating an augmented signal of 4600 millivolts, it would be equivilant to two times the signal of a 50,000 watt non directional antenna, or 100,000 watts,
If I'm not right, someone please provide the correct info.
Back in the nineties I was able to grab KNBR a few times in Owensboro, KY using the Superadio II. WSCR and WLW with their "noise" forbid that today. www.fybush.com toured the site and its unique antenna.
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