D:\KSCY\K286CY Bozeman Mod Engineering May 2021.Wpd

$D:\KSCY\K286CY Bozeman Mod Engineering May 2021.Wpd$

HATFIELD & DAWSON STEPHEN S. L OCKWOOD, PE, PMP CONSULTING ELECTRICAL ENGINEERS TELEPHONE (206) 783-9151 ))))) 9500 G REENWOOD AVE. N. FACSIMILE (206) 789-9834 THOMAS M. E CKELS, PE SEATTLE, WASHINGTON 98103 E-MAIL [email protected] THOMAS S. G ORTON, PE ))))) ))))) MAURY L. H ATFIELD , PE JAMES B. H ATFIELD, PE (1942-2009) BENJAMIN F. D AWSON III, PE PAUL W. LEONARD , PE ERIK C. S WANSON , PE, PMP (1925-2011) DAVID J. P INION , PE STEPHEN P UMPLE , M.Eng, MBA, PMP CONSULTANTS

Modification of Construction Permit K286CY Bozeman, MT May 2021

Allocation Study The attached spacing study shows the spacing between the proposed translator site and the location of cochannel and adjacent channel stations and proposals. This study was made with the Commission's Class A spacing requirements, and individual situations were examined to determine the lack of prohibited contour overlap per the requirements of §74.1204 of the Rules. The attached allocation study map demonstrates compliance with the Commission's Rules for protection of FM broadcast stations and FM translators as outlined in §74.1204.

The spacing study demonstrates compliance with spacing restrictions to stations which are 53 or 54 channels removed from the proposed operation.

Third Adjacent Channel The proposed translator transmitter site is located within the 60 dBu protected contour of third- adjacent channel station KKQX 289C2 Manhattan. The following calculation, performed using the Living Way methodology, demonstrates interference protection to that station. Protected Distance & Station ERP and Station Field Corresponding Distance to Station Bearing to HAAT on that Strength at Translator Translator Proposal azimuth Proposal Interfering Contour Interfering Contour

KKQX 36.36 km 12.3 kW 68.8 dBu 108.8 dBu 403 meters 289C2 347 deg True 327 meters F(50,50) Free Space

The 108.8 dBu contour extends 403 meters horizontally from the proposed facility, and (as is depicted on the attached transmitter site map) overlaps only transmitter buildings at the Horseshoe Hills tower site. There is no population within this contour. Therefore, the proposed facility is demonstrated to satisfy the requirements of §74.1204(d) with respect to KKQX.

Hatfield & Dawson Consulting Engineers FMSTUDY.EXE Copyright 2020, Hatfield & Dawson, LLC Version 5.00 ======SEARCH PARAMETERS FM Database Date: 20210506 Channel: 286A 105.1 MHz Page 1 Latitude: 45 57 24.7 (NAD83) Longitude: 111 22 16.4 Safety Zone: 50 km Job Title: K286CY AT HORSESHOE HILLS

Call City Channel ERP(kW) Latitude Bearing Dist Req Status St FCC File No. Freq. HAAT(m) Longitude deg-True (km) (km) ======KBZM BIG SKY 284C1 5.000 45 16 40.7 184.7 75.70 75 LIC MT BLH-20040728AMQ 104.7 1017.0 111 26 59.9 0.70 CLOSE

KIKF CASCADE 285C 94.000 47 9 33.9 11.5 136.49 165 LIC MT BLH-20011210ABW 104.9 621.0 111 0 41.8 -28.51 SHORT

K286CY GALLATIN GATEWAY 286D 0.250 45 38 19.7 167.0 36.28 0 CP MT BNPFT-20180807AC 105.1 0.0 111 15 58.8 0.00 TRANS

KMTX HELENA 287C0 31.000 46 44 53.7 320.4 114.84 152 LIC MT BMLH-20140721ADU 105.3 593.0 112 19 49.0 -37.16 SHORT

KKQX MANHATTAN 289C2 12.300 45 38 15.7 167.4 36.36 55 LIC MT BLH-20060223AAF 105.7 208.0 111 16 7.8 -18.64 SHORT

44444 END OF FM SPACING STUDY FOR CHANNEL 286 44444

Hatfield & Dawson Consulting Engineers JUDITH BASIN

LEWIS AND CLARK

MEAGHER

KIKF 285C Cascade 60 dBu F(50,50)

BROADWATER

KMTX 287C0 Helena 60 dBu F(50,50) JEFFERSON

GALLATIN

K286CY 286D Bozeman 54 dBu F(50,10)

MADISON

K285AF 285D Mammoth Hot Springs 60 dBu F(50,50)

PARK

LEWIS AND CLARK

MEAGHER

BROADWATER

K286CY 286D Bozeman JEFFERSON 100 dBu F(50,10)

GALLATIN

MADISON

KBZM 284C1 Big Sky 60 dBu F(50,50)

PARK

K286CY BozemanPARK 2Adj Study Map 0 204060 Kilometers BEAVERHEAD ©2013 CALIPER Hatfield & Dawson 5/2021 Facilities Proposed The proposed operation will be on Channel 286D (105.1 MHz) with a maximum lobe effective radiated power of 250 watts. Operation is proposed with a 2-element directional antenna, which will be mounted on an existing tower at the Horseshoe Hills tower site, with Antenna Structure Registration Number 1240789.

Ground-Level RF Exposure Calculations The power density calculations shown below were made using the techniques outlined in OET Bulletin No. 65. "Ground level" calculations in this report have been made at a reference height of 2 meters above ground to provide a worst-case estimate of exposure for persons standing on the ground in the vicinity of the tower. The equation shown below was used to calculate the ground level power density figures from each antenna.

2 3340981.()× AdjERP Watts S(/)µ W cm = D2 Where: AdjERP(Watts) is the maximum lobe effective radiated power times the element pattern factor times the array pattern factor.

D is the distance in meters from the center of radiation to the calculation point.

Ground level power densities have been calculated for locations extending from the base of the tower to a distance of 500 meters. Values past this point are increasingly negligible.

Calculations of the power density produced by the K286CY antenna system have been made assuming that the antenna will radiate 100% power straight down to a point 2 meters above ground at the base of the tower (69.6 meters below the antenna). Under this worst-case assumption, the highest calculated ground level power density from K286CY occurs at the base of the antenna support structure. At this point the power density is calculated to be 3.4 µW/cm², which is 1.7% of 200 µW/cm 2 (the FCC standard for uncontrolled environments).

These calculations show that the maximum calculated power density produced at two meters above ground level by the proposed operation of K286CY alone is less than 5% of the applicable FCC exposure limit at all locations between 1 and 500 meters from the base of the antenna support

Hatfield & Dawson Consulting Engineers structure. Section 1.1307(b)(3) of the Commission's Rules excludes applications for new facilities or modifications to existing facilities from the requirement of preparing an environmental assessment when the calculated emissions from the applicants proposed facility are predicted to be less than 5% of the applicable FCC exposure limit. Therefore, the proposed facility is in compliance with Section 1.1301 et seq and no further analysis of RF exposure at this site is required in this application.

The permittee/licensee in coordination with other users of the site must reduce power or cease operation as necessary to protect persons having access to the site, tower or antenna from radiofrequency exposure in excess of FCC guidelines.

Hatfield & Dawson Consulting Engineers TOSTON

BROADWATER

PONDEROSA PINES KSCY 295C3 Four Corners 60 dBu F(50,50)

JEFFERSON SEDAN WHEATLAND K286CY Bozeman 60 dBu F(50,50) Proposed GALLATIN RIVER RANCH

THREE FORKS LOGAN SPRINGHILL MANHATTAN

WILLOW CREEK BRIDGER

GALLATIN BELGRADE

CHURCHILL

HARRISON

FOUR CORNERS BOZEMAN

GALLATIN GATEWAY K286CY Bozeman 60 dBu F(50,50) Original CP

MADISON

PRAY

EMIGRANT

ENNIS

SOUTH GLASTONBURY