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WHY AM I GETTING WMAZ MACON ???
- Thread starter gregg75
- Start date
Wow... a digital signal reaching extra far away... must of been a special atmospheric condition for that to happen. Maybe they were having transmitter problems, and the power was too high... just throwing out some theories.
Tropospheric (sp?) perhaps. I know nothing about that element but would like to learn. I was getting at least 5 new rf/physical signals I've NEVER picked up before last night! and a picture from WHIQ out of Huntsville with a bowtie antenna indoors!!
I am really curious as to when/if W23DN (Home Shopping Network) will launch their digital transmission on rf 45? I havent picked up a whiff of analog 23 in a while so they may have already started. They have a CP and *may* already be broadcasting at a whopping 1k of power...I dont know how to read FCC charts....wonder if theyll have to relocate...there wont be any bandwith left above ch7 at this point!
I am really curious as to when/if W23DN (Home Shopping Network) will launch their digital transmission on rf 45? I havent picked up a whiff of analog 23 in a while so they may have already started. They have a CP and *may* already be broadcasting at a whopping 1k of power...I dont know how to read FCC charts....wonder if theyll have to relocate...there wont be any bandwith left above ch7 at this point!
Tropospheric refraction.
Take a glass, fill it halfway with water, and drop in a spoon. See how the spoon seems to "break" at the surface of the water? That happens because light travels faster in air than in water -- the light reflected from the spoon is bent at the water's surface.
Same thing happens with radio signals. In theory, if you were too far from the transmitting antenna to see it (assuming no obstructions) you wouldn't be able to receive the station. In practice, air density (and temperature) changes with elevation. This bends signals back towards earth, allowing you to receive (TV, and FM) stations whose towers are too far away to see.
Sometimes, for weather-related reasons, the temperature doesn't drop with elevation as quickly as normal. (in severe cases it may even increase with elevation over some part of the atmosphere) When this happens, signals are bent back to earth at a greater distance than normal.
And you receive Macon stations in Atlanta.
(I live 25 miles northwest of Nashville. Most days, if I leave my FM radio tuned to 94.9, I *will* eventually hear 94.9 The Bull. Same idea: atmospheric bending. It helps that there is no station on 94.9 within 100 miles.)
Since someone will bring it up... there are other phenomena which will result in reception of distant FM & TV (and AM) stations. The specific type of reception you're describing is tropospheric refraction.
Take a glass, fill it halfway with water, and drop in a spoon. See how the spoon seems to "break" at the surface of the water? That happens because light travels faster in air than in water -- the light reflected from the spoon is bent at the water's surface.
Same thing happens with radio signals. In theory, if you were too far from the transmitting antenna to see it (assuming no obstructions) you wouldn't be able to receive the station. In practice, air density (and temperature) changes with elevation. This bends signals back towards earth, allowing you to receive (TV, and FM) stations whose towers are too far away to see.
Sometimes, for weather-related reasons, the temperature doesn't drop with elevation as quickly as normal. (in severe cases it may even increase with elevation over some part of the atmosphere) When this happens, signals are bent back to earth at a greater distance than normal.
And you receive Macon stations in Atlanta.
(I live 25 miles northwest of Nashville. Most days, if I leave my FM radio tuned to 94.9, I *will* eventually hear 94.9 The Bull. Same idea: atmospheric bending. It helps that there is no station on 94.9 within 100 miles.)
Since someone will bring it up... there are other phenomena which will result in reception of distant FM & TV (and AM) stations. The specific type of reception you're describing is tropospheric refraction.
gregg75 said:
new hampster in the wheel!
1st of all, thanks for the clarification and for evvvvvvbwerything you do, Trip & congrats on the Luken gig! I've relied on and enjoyed all of the info you've provided on 2-3 boards and YOUR sight has been prominently placed on my launch screen since I first discovered it after cutting the cord!
Are you positive that signal you detected wasn't from WGNM? Did you happen to test for a signal on 45.2 (WGNM's sub: CTNi) or 45.3+ (nothing on either W45DX-D or WGNM) or would the precense or lack thereof a signal on anything else tell you which signal you were detecting considering W45DX-D has no subs?
So does this mean W23DN is silent now? Assuming (if so) that just leaves channel 4 as the lone remaining analog channel left in my area by the airport. (I've never got anything on 14, 22, 26, 32, 38, 40, 45, 47 or 49 which some sites still list as on air)
Are you positive that signal you detected wasn't from WGNM? Did you happen to test for a signal on 45.2 (WGNM's sub: CTNi) or 45.3+ (nothing on either W45DX-D or WGNM) or would the precense or lack thereof a signal on anything else tell you which signal you were detecting considering W45DX-D has no subs?
So does this mean W23DN is silent now? Assuming (if so) that just leaves channel 4 as the lone remaining analog channel left in my area by the airport. (I've never got anything on 14, 22, 26, 32, 38, 40, 45, 47 or 49 which some sites still list as on air)
K
kenglish
Guest
With the weather ya'll are getting lately, I'd bet on Tropo.
Mattswad said:
Thank you.
I checked for a signal on channel 45, any signal. It was weaker than I would have expected for W45DX-D, but stronger than what Longley-Rice suggests I should have seen for it to be WGNM. Nothing was close enough to decoding to determine the number of subchannels, let alone content.
Yes, 23 should be gone now, replaced by 45.
- Trip
- Status