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Background:  Vendor is attempting to determine if sufficient UHF Public Safety channels are available to license a multi-site, multi-channel MPT trunking system.  The government agencies have been told that no channels are available, and that they must build an 800 MHz system.

Date:  2005-2006

1.

Subject: Availability of Frequencies for the Christian County System
Date: Tuesday, May 31, 2005 5:28 PM

Sir,

After our visit with the consultant, we did the research on the availability of UHF government channels for the Christian County system.

I've attached some of my source material in the "Master List" xls spreadsheet [deleted]

Basically, what I did was to download all UHF government licenses within about a 90 mile radius of the County. I then cleaned it up and deleted all the terminated, cancelled, or otherwise no longer valid authorizations.

I then imported all the data into my mapping software, and sorted by frequency, from each of the 6 sites on your proposal. I sorted them all by site, and put them back into my spreadsheet, with a frequency listing of all UHF government channels, and any special requirements or issues.

After looking over each and every government channel, on each site, I made an educated guess on which channels would probably be available with contour studies. (Those choices are highlighted in dark and light yellow).

I then took the site that I thought would be the most difficult to find any channels (Oak Grove), and ran contour studies on all of my primary choices (dark yellow).

Using 150 watts ERP as my "expected" power for this site, and just within the 450 MHz sub-band, I came up with 14 easily available channels, requiring no special waivers to obtain, other than standard contour studies. These channels are:

These channels are listed with a dark yellow background, bold font, and a flag of "150 ERP" in the "County" column of the Oak Grove worksheet. I have already done all the work to verify the availability of these channels. I have the contour studies, and can provide them if you need this to "backup" the claim of available channels in negotiations with the County. .

Just glancing over my work, I feel like there are at least 4 to 6 channels easily available in the 460 sub-band, and even more with a little work.

As you move from site to site, some channels may drop out, but others will become available. As well, if something less than 150 watts ERP is acceptable, there are even more channels available. Finally, with a few simple waivers, or just knowing a few tricks, there are even more frequencies within the government band I can license.

Bottom line: There are PLENTY OF CHANNELS FOR THIS SYSTEM!

I see the issue more of which channels you should license on a site in order to make it less prone to interference, and cheaper to combine.

All this data is of perishable. The first 800 MHz licensing freeze just went into effect, and it's possible that this will drive some new systems down into the UHF band. As well, any application that comes through the coordination system after I did my download may subtract from the number of available channels.

Call if you have any questions.

PROS Ltd

2

 To see a copy of the license that was eventually granted from the channel options given in the above email:

Click here: WQDP576

The license was later modified, based on changes to the final system design on the frequency data listed below.

3

Subject: Christian Cty KY MPT - Freq x Site list
Date: Wednesday, January 18, 2006 10:01 AM

Sir,

Attached is an excel spreadsheet with an available freq by site matrix.

I've given the acceptable ERP for each frequency, at each site, figuring 150 feet AGL antenna. These figures may change slightly, based on the final height.

Previous licenses for this system were deleted from the search, and I started de nova. I will modify the current license to incorporate any frequency changes.

Notes:

453.675 was calculated, but will only be available if Christian County will give permission to use this channel, as it is currently licensed within the County on callsigns KBO824 and WYX510.

460.625 is the same, with callsign WPIB303.

The freqs annotated as "LP" are low power channels that I can get licensed for high power usage.

460.3875 is a good channel, but due to politics in Tennessee, it will be contested during coordination. I'm fairly confident of winning the fight, but avoiding this channel (or only using it on the northern-most site) will speed the process.

I can choose the channels for your combiners, if you wish, if you provide me guidance on your parameters.

The requested channel breakdown is:

Site 1 Oak Grove (southern site) 5 channels
Site 2 Gainsville (central site) 7 channels
Site 3 Kelly WT (northern site) 5 channels.

Please give me a call if you have any questions. Time is of the essence in the licensing process, and it's possible that frequencies may become unavailable at any time. Anything I can do to help expedite this process, simply ask.

PROS Ltd
 

4.

 Available Frequency List by Site

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