Class C4 and why should classes matter, anyway?

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iowegian3
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Class C4 and why should classes matter, anyway?

Post by iowegian3 » Thu Apr 24, 2014 8:44 am

Prompted by this recent RW online article:http://www.radioworld.com/article/ssr-r ... s-c/269985

I suspect C4 (12kW/100m) probably won't gain much traction until competing needs such as AM on FM translators are met first. And, with any primary station upgrade, secondary class Ds such as AM on FM translators and LPFMs may need to be protected if a preclusion study shows there is no other alternate channel available.

The next question is why are we still hanging on to mileage separations? In the NCE band, a class C4 designation would be moot. A 12 kW/100m operation would receive a nominal class C3 or B1 designation. But in contour protection, beyond the A/C-B1-B designations and the 60-57-54 dBu protections, respectively, it doesn't matter what class of station it is you're trying to protect.

The band is mature. And the information is out there, such as azimuth HAAT for each station/translator/LPFM. (The case could also be made thatwe could move to Longley-Rice projections exclusively, but that would be too cutting edge for the FCC) Finally, protecting arbitrary fully-spaced assignment points with DA operationsis spectrally inefficient, as the DA is over-protected in the azimuths between the assignment point and the transmitter site.

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Deep Thought
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Re: Class C4 and why should classes matter, anyway?

Post by Deep Thought » Thu Apr 24, 2014 9:08 am

Be careful what you wish for. The NCE band is congested as hell in most medium to large markets precisely because of the exclusive use of contour protection. And while 73.313 does over-protect in the flatlands it severely underprotects in mountainous areas overlooking valleys (which are mostly in class-C territory) as some LPFMs are starting to find out. And do you really want to be locked in like most AMs are, unable to make any changes at all?

The FCC is quite happy to use Longley-Rice. Are you willing to deal with the aftermath of its adoption?
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

TPT
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Re: Class C4 and why should classes matter, anyway?

Post by TPT » Thu Apr 24, 2014 2:08 pm

Amen!

iowegian3
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Re: Class C4 and why should classes matter, anyway?

Post by iowegian3 » Thu Apr 24, 2014 7:04 pm

To the question of the fully-spaced assignment point, once a station specifies a DA, should the assignment point be protected going forward?

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Deep Thought
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Re: Class C4 and why should classes matter, anyway?

Post by Deep Thought » Thu Apr 24, 2014 8:17 pm

That only applies to 73.215-authorized stations that don't meet the spacing requirements and has nothing to do with splitting classes or going to a straight-up contour protection allocation system.
Mark Mueller • Mueller Broadcast Design • La Grange, IL • http://www.muellerbroadcastdesign.com

iowegian3
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Re: Class C4 and why should classes matter, anyway?

Post by iowegian3 » Thu Apr 24, 2014 8:36 pm

Fair enough. I'll start a new topic.

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