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Explain to me how can KNX-AM be heard in Florida when WAPI occupies 1070 in AL

FCC AM Query database says the following:

Power: 5.0 kilowatts (kW) Nighttime DAN - Directional Antenna: Nighttime only
 
ercjncpr said:
FCC AM Query database says the following:

Power: 5.0 kilowatts (kW) Nighttime DAN - Directional Antenna: Nighttime only
Click to expand...

So if WAPI throws its nighttime pattern due north, KNX's signal has a clear shot across the Gulf of Mexico.
 
WAPI throws it's nighttime signal to the souteast....right at FLA.

The reason you are probably hearing KNX at night (sometimes) is skywave reflection. Depending on the time of night, the different layers of the atmosphere reflect am waves back to earth. Remember back in physics class when the teacher used the flashlight and mirror to teach angle in equals angle out. Same thing with radio waves....at some point in the night KNX's skywave signal is being reflected back to earth. In your example, the reflection probably occurs in the middle of the night over a place halfway between you and KNX, and for a while you will get KNX....it will go away as the reflection density of the atmosphere changes as time passes. WAPI can probably be heard at other times of the night, based on this same reflection. I wouldn't be surprized if you got WFNI out if Indianapolis as we shoot to the Southeast also...I can regularly get it in Charleston, SC and there is a 1070 outside of Charlotte, NC.

Hope this helps

John Kesler
Emmis Indianapolis
 
I actually live in Norcal but I saw a Youtube Vid claiming that KNX can be in Florida. I can Hear KNX from Vallejo because The signal bounces from the KNX transmitter to Ozone Layer to Vallejo.
I also heard of a claim that KNX can be heard from the Philippines and China one time but I doubt it because They must have a station on 1070 AM over there.
 
The funny thing is I live in Southern California and in a lot of areas can pick up 740 KCBS from San Francisco clearer than I can KNX.
 
recto101 said:
I actually live in Norcal but I saw a Youtube Vid claiming that KNX can be in Florida. I can Hear KNX from Vallejo because The signal bounces from the KNX transmitter to Ozone Layer to Vallejo.
I also heard of a claim that KNX can be heard from the Philippines and China one time but I doubt it because They must have a station on 1070 AM over there.
Click to expand...

When things like reception of KNX in Florida occur, they are very rare occurrences. Normally, closer stations, propagation conditions and similar things prevent such reception.

Many decades ago, nearly every station was off the air from around midnight Sunday to early Monday morning (5 or 6 AM) for routine transmitter maintenance. So stations in other time zones could easily be heard as they signed off later or signed on earlier. As an example, my Cleveland local on 1420 was 24 hours except Sunday night; when it went off I got stations as far off as central Washington state that signed off several hours later.

Conditions may cause normal reception to be altered... a common cause affecting northern areas is the Aurora Borealis. A station I would never have heard, a 10 kw Venezuelan on 1100, was noted once over (what is now) WTAM, 50 kw no more than 30 miles away. All due to conditions that affect the bounciness of the ionosphere and its ability to refract AM signals.

In the case of KNX, the dominant station in the east used to be the CBC station in New Brunswik, a 50 kw operation. But that station is silent as are many Canadian AMs, allowing some receptions that were not possible for decades.
 
Uncle Rob said:
The funny thing is I live in Southern California and in a lot of areas can pick up 740 KCBS from San Francisco clearer than I can KNX.
Click to expand...

I listened to KGO 810 in the San Fernando Valley at 9pm one time when I was heading to Downtown LA and It was clearer than KNX when I reached Downtown LA. I think it has to do with buildings blocking off parts of the signal. I even heard of KNX clearer in Vallejo than KGO.
 
recto101 said:
Uncle Rob said:
The funny thing is I live in Southern California and in a lot of areas can pick up 740 KCBS from San Francisco clearer than I can KNX.
Click to expand...

I listened to KGO 810 in the San Fernando Valley at 9pm one time when I was heading to Downtown LA and It was clearer than KNX when I reached Downtown LA. I think it has to do with buildings blocking off parts of the signal. I even heard of KNX clearer in Vallejo than KGO.
Click to expand...

KCBS transmit from Mount Beacon in Marin County along with 106.9 fm KCBS silmulcast.
 
recto101 said:
Uncle Rob said:
The funny thing is I live in Southern California and in a lot of areas can pick up 740 KCBS from San Francisco clearer than I can KNX.
Click to expand...

I listened to KGO 810 in the San Fernando Valley at 9pm one time when I was heading to Downtown LA and It was clearer than KNX when I reached Downtown LA. I think it has to do with buildings blocking off parts of the signal. I even heard of KNX clearer in Vallejo than KGO.
Click to expand...

In the 60s and 70s, My mother was a talk-radio junkie, and listened to KGO many nights from our home in Tujunga - in the foothills, east of the San Fernando Valley near Glendale. I remember Ira Blue quite well.

Meanwhile, in my room, I would often be DXing KFRC, which often came in well though it was only 5,000 watts.
 
KGO comes in clear on a cheap clock radio at night in Lewiston, Idaho. I live about 100 miles northwest of Lewiston and cannot pick it up at all.

Norman
 
I started seriously DXn AM in January 1974. All I had to help me was the Vane Jones book. (See a sample via DavidEduardo at www.amlogbook.com --- mine was the salmon colored one from 1972-73.)

At that time, I did not understand how AM at night worked----I thought (apparently) that all AM stations were non-directional. I never could understand why, from my home in Hialeah FL, I could hear WDBF 1420 only in the day, but not at night; WRBL Columbus GA was the dominant one, but when I was vacationing with my folks near Ocala, I did manage to hear WDBF!

Then much much later, I bought the NRC AM Logbook with the night pattern maps. Then I understood more.

Today in south FL, AM at night is an absolute mess. Almost every frequency sounds like a graveyarder. I hardly bother anymore. Most of the time I restrict my AM DXn to daytime, from remote areas, just to see how far the signals go.

BTW, I did hear KNX in late 1990 from Broward County FL, but not since---not that I have tried. Also in 1988 or 89 I heard KNIX (now KMIK) near Phoenix (with WSRF off in the overnight), despite a pattern toward Australia!

cd
 
recto101 said:
KCBS transmit from Mount Beacon in Marin County along with 106.9 fm KCBS silmulcast.
Click to expand...

KCBS's 4 towers are located on a riverside location off the northern part of San Pablo Bay near Olompali State Historical Park in what looks pretty much like marshlands or recovered marshlands in or adjacent to Novato at less than 10 feet above sea level. It is certainly not on a mountain, as mountains and AM, unless unavoidable, don't mix very well. And it's not located near the (original) KPUP / KHIP / KMPX site on Beacon, which is about 12 or 13 miles SSW just west of Sausalito in the Golden Gate State Park .
 
At night I hear KNX for my area in Vallejo, but it come in & out..But when I'm in So Cal like in my LA area, I could hear KCBS clear as a bell
 
Like here with 1070. I get WFNI very frequently in Charleston, but I never get KNX even though it can be picked up sometimes in FL. 1070 is like a regional frequency here.
 
When I lived in San Diego, KNX's and KFI's signals were as if they were locals. KCBS-AM and KGO would come in quite nicely, though there were times when either would be a little scratchy. KNBR was a little hard to get, as it sat on the dial next to XETRA-690.
 
[/quote]

I listened to KGO 810 in the San Fernando Valley at 9pm one time when I was heading to Downtown LA and It was clearer than KNX when I reached Downtown LA. I think it has to do with buildings blocking off parts of the signal. I even heard of KNX clearer in Vallejo than KGO.
[/quote]

KCBS transmit from Mount Beacon in Marin County along with 106.9 fm KCBS silmulcast.
[/quote]

KCBS (AM) transmits from a site near Novato, CA using four towers. Its nighttime directional pattern is aimed almost due south to protect a Canadian 50 kw AM station. The 106.9 FM site is on Mt. Beacon. It simulcasts KCBS, but its actual call letters (used only in top-of-the-hour station ID's) is KFRC-FM.
 
DavidEduardo said:
In the case of KNX, the dominant station in the east used to be the CBC station in New Brunswik, a 50 kw operation. But that station is silent as are many Canadian AMs, allowing some receptions that were not possible for decades.
Click to expand...
Just a note Dave, that 50 kW non-directional flamethrower on 740, once CBC's news-talk outlet in Toronto, Ontario, Canada, is still on the air as pop-standards CFZM. It has a loyal, although not sizable niche for itself in the BBM ratings and gets into Buffalo and Rochester like a local. The 740 Wiki info is fairly accurate.
 

I listened to KGO 810 in the San Fernando Valley at 9pm one time when I was heading to Downtown LA and It was clearer than KNX when I reached Downtown LA. I think it has to do with buildings blocking off parts of the signal. I even heard of KNX clearer in Vallejo than KGO.
[/quote]

KCBS transmit from Mount Beacon in Marin County along with 106.9 fm KCBS silmulcast.
[/quote]

KCBS (AM) transmits from a site near Novato, CA using four towers. Its nighttime directional pattern is aimed almost due south to protect a Canadian 50 kw AM station. The 106.9 FM site is on Mt. Beacon. It simulcasts KCBS, but its actual call letters (used only in top-of-the-hour station ID's) is KFRC-FM.


[/quote]










Thanks I forgot for one second that KCBS-FM is on 93.1 and transmitt from Mount Wilson.
 
recto101 said:
I actually live in Norcal but I saw a Youtube Vid claiming that KNX can be in Florida. I can Hear KNX from Vallejo because The signal bounces from the KNX transmitter to Ozone Layer to Vallejo.
I also heard of a claim that KNX can be heard from the Philippines and China one time but I doubt it because They must have a station on 1070 AM over there.
Click to expand...

I know of several people who have reported hearing KNX in Australia & the Fiji Islands.
 
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