AM: Night Protection
The Night Protection
Requirements study calculates permissible radiation toward other
co-channel and first-adjacent-channel stations where pertinent. Required
protection figures are generated using appropriate FCC Rules and
International Agreements. For more information, see
Report
Details below.
Download Program Sample
Customers must provide the following
information to run this report:
- Job title
- Call sign
- Frequency
- Coordinates
Report Details
For domestic class B (II or III) or C
(IV) facilities, protection is based on the RSS night limit with the 50%
exclusion rule applied. Ten percent radiation reductions are calculated
where appropriate.
For class A (I) clear channel stations,
the 0.5 mV/m (0.1 mV/m for class I-N stations) 50% skywave contour is
calculated. For domestic stations, the geo-magnetic latitude corrected
method specified in the FCC Rules is used. For foreign stations, methods
specified in International Agreements are used.
In cases where the class A (I) skywave
contour extends into the ocean or beyond an international border, the
contour is truncated at the border. The skywave and groundwave fields at
the point of truncation are calculated, and the greater of the two is
chosen as the protected signal strength value. In cases where both are
below 0.5 mV/m, protections falls back to the station 0.5 mV/m
groundwave contour. All calculations are made for 360 radials around the
class A (I) transmitter site.
The program output includes, for each
station, call sign, authorization (application, CP or license),
frequency, night power (kW), latitude, longitude, state code, great
circle distance, slant (path) distance, azimuth to station, azimuth from
station, great circle mid-point latitude, geo-magnetic mid-point
latitude, minimum and maximum vertical angles (theta), skywave
multiplier, 50% RSS night limit, 25% RSS night limit, required
protection, and allowed radiation. Also listed are all stations
contributing to a station's 25% RSS night limit, along with the value of
their contribution.
The study concludes with a tabulation of
allowed radiation for each degree of azimuth around the study site. Also
included is a detailed individual night limit for the study site.
Price: $700.00 per
frequency
To purchase, please call
800.331.5086 or
email
info@bia.com.
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