[opendtv] Re: Qualcom OFDM networks with MediaFlo
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 10 Nov 2004 21:59:03 -0800
Bob wrote:
>I am only talking of ERP. The rules for use of channels 52 to 59 limit ERP
>to 50 kW.
I wouldn't classify this as a "big stick" operation in relative DTV terms,
but perhaps a medium one. The most powerful DTV authorizations in the U.S.
are 1,000 KW ERP while the lowest power DTV stations are generally
authorized down in the 100 KW range. There will eventually be an LPTV DTV
service but I don't know that the technical parameters are yet established.
----- Original Message -----
From: "Bob Miller" <bob@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, November 10, 2004 5:17 PM
Subject: [opendtv] Re: Qualcom OFDM networks with MediaFlo
> Dale Kelly wrote:
>
>>Bob wrote:
>>
>>
>>>Second they (Qualcom) are limited to 50 kW so if that is big stick it is
>>>but I would think big stick high power starts at 200 kW and over. LPTV is
>>>definitely 15 kW and lower.
>>>
>>>
>>
>>Question Bob: are the power levels you mention in ERP (effective radiated
>>power) or are they in TPO (transmitter output power)? This is a major
>>distinction. i.e.:
>>
>>
> ERP.
>
>>A UHF LPTV station can have a max TPO of 10KW but might have an ERP of up
>>to
>>150 KW (below the radio horizon).
>>
>>
> A digital LPTV station is limited to 15 kW ERP.
>
>>A DTV stations power level is expressed in average ERP and it's
>>transmitter
>>power is a function of the antenna system's gain the transmission line
>>losses. The taller the "stick", the more TPO required for a given antenna.
>>
>>
> And the transmission lines losses, understood. I am only talking of ERP.
> The rules for use of channels 52 to 59 limit ERP to 50 kW.
>
> Bob Miller
>
>>----- Original Message -----
>>From: "Bob Miller" <bob@xxxxxxxxxx>
>>To: <opendtv@xxxxxxxxxxxxx>
>>Sent: Wednesday, November 10, 2004 2:56 PM
>>Subject: [opendtv] Re: Qualcom OFDM networks with MediaFlo
>>
>>
>>
>>
>>
>>
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>
>
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