Technical Report
K259CF Modification To Non-adjacent Channel
Waiver of §74.1233(a)(1) Requested
An interference complaint has been lodged against the licensed
K259CF facility by 1st adjacent channel station KCIV, Mount Bullion, CA (FCC ID #6504
). This non-adjacent channel change is filed to resolve that complaint and
a waiver of §74.1233(a)(1) is requested to permit the change to channel 272 (102.3 mHz). I
f the Commission determines that a waiver will not be granted, it is requested that action on this application
be withheld until the Commission takes action on MB Docket No. 18-119 wherein the Commission has proposed to amend the rules to permit such non-a
djacent channel changes to resolve interference complaints. Since the Commission originally proposed the rule change and the comments were overwhelmingly supportive
it seems logical that this change will be adopted.
This technical report is submitted for a minor modification to K259CF, FCC file no. BLFT-20180306AAR. A non-adjacent move to channel 272 with
corresponding changes in antenna and ERP are submitted. The translator will continue to serve as a non fill-in facility to rebroadcast KYAF(FM) 234A at Firebaugh, CA,
FCC facility I.D. 9993. K259CF Modification Analysis:An overlap study (exhibit E-1) shows the K259CF modification to channel 272 is within the KHGE(FM) 274B and KLB
N(FM) 270B second adjacent protected contours. Using the vertical elevation pattern of the Nicom BKG88 four bay, 0.85 wavelength spaced antenna (exhibit E-2), the
+40 F(50-10) dBu contours within the protected Anderson Associates Broadcast Consultants contours are shown in exhibits E-3 and E-4. The +40 F(50-10) dBu contour within the
lower KLBN(FM) protected contour (exhibit E-4) lowest point = 3.5 meters above the site elevation which does not reach any buildings, roads or population, as shown in the
aerial photo and street view in exhibits E-5 and E-6. As a non fill-in translator, an HAAT calculation is included in exhibit E-7 and shows the highest of the 12 rad
ials is 56 meters using the 03 second USGS terrain data, At 75 watts ERP, the modification is below the maximum permitted ERP for a non-fill-in translator, following the rul
es provided in CFR §74.1235(b)(2).
A plot of the 60 dBu contour relative to the primary KYAF(FM) 60 dBu contour and overlap to the current K259CF 60 dBu contour is shown in exhibit E-8.
Antenna System:K259CF is located on the existing tower 34 meter tower at coordinates:
36 47 56N 119 47 24W NAD 27.
A TOWAIR determination (exhibit E-9) shows the tower does not require registration. A Nicom BKG88 four bay, 0.85 wavelength spaced nondirectional ant
enna will be mounted at a COR AGL of 30 meters, 126 meters AMSL and operate at 0.075 kW ERP.
RF Exposure Calculation:The RF contribution was calculated using the formula from the OET Bulletin 65:
S (RF in microwatts/cm2) = 33.4 x F2 x (H ERP + V ERP in watts) R2 (height of radiation center in meters -2m)
Using a worst case vertical (F) factor of 1.0, the RF is calculated to be 6.39 μW/cm2 to the ground, which is below 5% of the 200 μW/cm
2 maximum permissible for general public exposure allowing exclusion from consideration. Anderson Associates Broadcast Consultants
Conclusion:
It is concluded the K259CF modification complies with all Commission rules and policies.