Are there any special requirements for Part 90 PLMR signal boosters

**1. Consent from Licensees:
Operators must obtain express written consent from the licensees whose signals will be retransmitted by the booster. This consent must be maintained in a recordable format and presented to the Commission or a licensee representative upon request[1][2].

**2. Qualified Installers:
Boosters should only be installed and maintained by qualified installers to ensure proper operation and compliance with regulations[1][2].

**3. Coverage Limitations:
These signal boosters are strictly for improving coverage in weak signal areas and cannot be used to extend the normal operating range of PLMR stations[3][4].

**4. Effective Radiated Power (ERP) Limitations:
The effective radiated power of the booster must be limited to 5 Watts on both the forward link and return link. This restriction is crucial to prevent interference with other communications[1][3].

**5. Registration Requirements:
Class B signal boosters, which can retransmit signals across a wide frequency band, must be registered with the FCC before operation. Class A devices, which operate on specific channels, do not require registration[5][6].

**6. Non-Interference Basis:
The operation of Part 90 PLMR signal boosters is on a non-interference basis. If a booster causes interference, the operator is required to either cease operation or adjust it to eliminate the interference[2][3].

These requirements are designed to ensure that signal boosters enhance communication capabilities without disrupting existing radio services, particularly for public safety communications.