[opendtv] KKTV Requests Move from VHF to UHF
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 2 Jul 2009 16:40:03 -0400
"The widely reported problems with VHF indoor DTV reception raised
concerns that VHF channels may not be suitable for mobile DTV."
Portable handheld, with no antenna to speak of, sure.
Mostly, I continue to believe that supposed VHF DTV flaw for indoor or
mobile reception is overstated, however. FM radio works, right? They do
require some form of antenna, even if the earpiece cable is given double
duty. Still, it works quite well.
Oh, yeah, but FM radio stations are often transmitting in the 20 to 50
KW ERP range, in a frequency band more similar to low VHF. KKTV,
mentioned here, 20.1 KW on Ch 10, was probably expecting to make its VHF
work as well as an FM radio station. But it must transmit 36 times as
much bandwidth with similar power level to FM?
No way. And they were allowed high power, compared with VHF examples on
this coast.
Bert
------------------------------
http://www.tvtechnology.com/article/83386
KKTV Requests Move from VHF to UHF
From Doug Lung's RF Report
by Doug Lung, 07.02.2009.
Gray Television, owner of KKTV in Colorado Springs, Colo., has asked the
FCC to substitute its Channel 10 allotment with Channel 49 for KKTV in
Colorado Springs in order to improve coverage.
Many stations with VHF DTV channels received complaints about poor
reception after the June 12 analog shutdown. The widely reported
problems with VHF indoor DTV reception raised concerns that VHF channels
may not be suitable for mobile DTV.
In its Notice of Proposed Rulemaking (MM Docket 09-111)[PDF], Gray
stated that the proposed channel substitution will resolve significant
reception problems inherent with high VHF digital channels, which have
been experienced by numerous viewers throughout KKTV's service area, and
will improve the possibility for future service to viewers using
handheld and mobile devices. On channel 10, KKTV is predicted to receive
interference to 54 percent of its population and to serve only 959,551
people. The proposed operation on Channel 49 is predicted to serve
1,922,413 people.
The FCC has determined that Channel 49 could be substituted for Channel
10 and would be in compliance with FCC rules for community of license
coverage and interference. The rulemaking proposes operation on Channel
49 with an effective radiated power (ERP) of 550 kW at a height above
average terrain of 725 meters. This exceeds the maximum ERP at this
height under Section 73.622(f)(8)(ii) of the FCC rules. However, this
ERP is allowed under Section 73.622(f)(5) because the proposed contour
will not exceed the coverage area of KTSC-DT, Channel 8, Pueblo, Colo.,
the largest station within KKTV(TV)'s market.
Comments on the Petition for Rulemaking are due 15 days after
publication in the Federal Register with reply comments due 10 days
later. The Petition for Rulemaking includes instructions for filing
comments.
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