User Manual
AirLink T1/E1 Installer’s Guide
Supplement - U.S./Canada Installation Rules
4 Rev. A - 4/95
In the following example, given antenna gain of 25 dBi, feedline loss of 3 dB,
and connector loss of 1 dB, the transmit output power cannot be adjusted to more
than 32 milliwatts (15 dBm).
Example
(a) Maximum allowable EIRP: + 36 dBm
(b) Plus feedline loss: + 3 dB
(c) Plus connector loss: + 1 dB
(d) Minus antenna gain: - 25 dB
(1) Resultant AirLink T1/E1 transmit output
power (sum of a through d): 15 dBm
(2) U.S. Specifications—FCC power limit: 36 dBm
(3) Maximum AirLink T1/E1 transmit output
power (the lesser of (1) and (2): 15 dBm
Tower Construction Considerations
When the use of AirLink T1/E1 systems requires construction of a tower, the
following requirements must be considered:
(1) Local and state zoning and tower construction regulations:
These requirements generally mandate that permits be obtained before any
tower construction begins. Check with local zoning and state aviation
authorities for more information.
(2) U.S. Federal Aviation Administration (FAA) and Federal Communications
Commission tower location, marking, and lighting requirements:
Unless the proposed antenna structure is less than 20 feet in height—except
one that would increase the height of another antenna structure, any
proposal to locate a tower within 20,000 feet of an aircraft landing area
(including private airfields and seaports) must be analyzed to determine
whether the FAA must be notified of the proposed construction by filing
FAA Form 7460-1 (Notice of Proposed Construction or Alteration) and to
determine whether a determination of no hazard should be sought. For any
proposed tower of 200 feet or more in height, regardless of location, the
FAA must be notified and a determination of no hazard must be obtained.
For any tower that requires painting and/or lighting: painting and lighting
requirements must be obtained from the Antenna Survey Branch of the
FCC’s Field Operations Bureau. For further information and referral to the
appropriate office, contact the nearest FAA regional office or flight service
center, and the nearest field office of the FCC.