M
My02AccordEx
Guest
Does anybody happen to know what WMVP is broadcasting at in terms of power. I know they are not at 50,000 watts during the day and most certainly not at night. They are not directional either right now.
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> Does anybody happen to know what WMVP is broadcasting at in
> terms of power. I know they are not at 50,000 watts during
> the day and most certainly not at night. They are not
> directional either right now.
Out here in Ohio AM 1000 is certainly listenable but not the blasting powerhouse it usually is (from my place in Columbus ESPN 1000 is usually like a local). That's been the case the last few nights.
> terms of power. I know they are not at 50,000 watts during
> the day and most certainly not at night. They are not
> directional either right now.
Out here in Ohio AM 1000 is certainly listenable but not the blasting powerhouse it usually is (from my place in Columbus ESPN 1000 is usually like a local). That's been the case the last few nights.
> Does anybody happen to know what WMVP is broadcasting at in
> terms of power. I know they are not at 50,000 watts during
> the day and most certainly not at night. They are not
> directional either right now.
>
They broadcasting under a Special Temporary Authority (STA)from the WLS transmitter site. I am not 100% sure about the power. Somebody mentioned the power on one of the DX lists, buit can't remember the exact figure. It's either 21 or 27 kW non-directional.
The STA is good until 04/24/2006.
> terms of power. I know they are not at 50,000 watts during
> the day and most certainly not at night. They are not
> directional either right now.
>
They broadcasting under a Special Temporary Authority (STA)from the WLS transmitter site. I am not 100% sure about the power. Somebody mentioned the power on one of the DX lists, buit can't remember the exact figure. It's either 21 or 27 kW non-directional.
The STA is good until 04/24/2006.
> Does anybody happen to know what WMVP is broadcasting at in
> terms of power. I know they are not at 50,000 watts during
> the day and most certainly not at night. They are not
> directional either right now.
>
I live in Downers Grove and the local newspaper had an artcile about the tower replacement. The article stated that the self supporting towers will be replaced with guy supported towers and it is projected to be completed in the spring.
The article also said this was being done to improve the stations capability to do HD broadcasting. Please explain why the type of tower would have anything to do with HD broadcasts.
> terms of power. I know they are not at 50,000 watts during
> the day and most certainly not at night. They are not
> directional either right now.
>
I live in Downers Grove and the local newspaper had an artcile about the tower replacement. The article stated that the self supporting towers will be replaced with guy supported towers and it is projected to be completed in the spring.
The article also said this was being done to improve the stations capability to do HD broadcasting. Please explain why the type of tower would have anything to do with HD broadcasts.
V
VideoPaul
Guest
The article stated that
> the self supporting towers will be replaced with guy
> supported towers and it is projected to be completed in the
> spring.
>
> The article also said this was being done to improve the
> stations capability to do HD broadcasting. Please explain
> why the type of tower would have anything to do with HD
> broadcasts.
>
I can't comment entirely intelligently without knowing a lot more specifics on the towers, but yes, HD radio on the AM band does require a much more perfectly planned, tuned and matched antenna system. The design of the tower array effects the Q of the antenna circuit, the linearity across the passband, and ultimately its ability to carry the much more intricate waveform for analog and digital combined. If the Q of the old tower was very narrow, then they would more certainly want to replace this for IBOC.
The characteristic impedance of the tower at the carrier frequency, the resistance and reactance of the tower, and whether or not it is grounded or isolated all effects this. (The FCC no longer licenses grounded AM towers for directional stations because of the problems with nighttime take-off angles with slant-wire fed radiators, so that's kind of academic.) With IBOC on AM, 50j0 needs to REALLY be 50j0.
So while it seems a bit odd on the surface, it's not BS.
--Paul
> the self supporting towers will be replaced with guy
> supported towers and it is projected to be completed in the
> spring.
>
> The article also said this was being done to improve the
> stations capability to do HD broadcasting. Please explain
> why the type of tower would have anything to do with HD
> broadcasts.
>
I can't comment entirely intelligently without knowing a lot more specifics on the towers, but yes, HD radio on the AM band does require a much more perfectly planned, tuned and matched antenna system. The design of the tower array effects the Q of the antenna circuit, the linearity across the passband, and ultimately its ability to carry the much more intricate waveform for analog and digital combined. If the Q of the old tower was very narrow, then they would more certainly want to replace this for IBOC.
The characteristic impedance of the tower at the carrier frequency, the resistance and reactance of the tower, and whether or not it is grounded or isolated all effects this. (The FCC no longer licenses grounded AM towers for directional stations because of the problems with nighttime take-off angles with slant-wire fed radiators, so that's kind of academic.) With IBOC on AM, 50j0 needs to REALLY be 50j0.
So while it seems a bit odd on the surface, it's not BS.
--Paul
>
> The characteristic impedance of the tower at the carrier
> frequency, the resistance and reactance of the tower, and
> whether or not it is grounded or isolated all effects this.
> (The FCC no longer licenses grounded AM towers for
> directional stations because of the problems with nighttime
> take-off angles with slant-wire fed radiators, so that's
> kind of academic.) With IBOC on AM, 50j0 needs to REALLY be
> 50j0.
Also, remember that the impedance and the reactance need to be linear across the desired bandwidth, as well.
> The characteristic impedance of the tower at the carrier
> frequency, the resistance and reactance of the tower, and
> whether or not it is grounded or isolated all effects this.
> (The FCC no longer licenses grounded AM towers for
> directional stations because of the problems with nighttime
> take-off angles with slant-wire fed radiators, so that's
> kind of academic.) With IBOC on AM, 50j0 needs to REALLY be
> 50j0.
Also, remember that the impedance and the reactance need to be linear across the desired bandwidth, as well.
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