As a final certification of a wireless system design, it is highly recommended that you use a pre-installation test kit which includes a PIM-T tester, which is typically placed where you plan to install a PIM, and a hand-held tester you can take from door to -door to validate RF coverage in the actual facility. By using the tester, you eliminate surprises within the walls that could impede the RF signal. While RF signals are capable of penetrating brick, concrete, wood, cinderblock, and plasterboard, challenges can occur in historical buildings which often have thick walls made of marble, granite, and stone, sometimes over two feet thick.
If the pre-installation test fails there are several options to try.
1) Sometimes the PIM-T is placed too close to metal objects like ventilation ducts, pipes, or cabinets. Try moving the PIM-T just inches, or locating the PIM-T in a clear zone or adjacent wall to eliminate obstructions.
2) Rotating a PIM-T 90 degrees may resolve the problem.
3) Other transmitting devices in or around the building may be blocking the signal. With PIM-T’s hard coded to Channel 15, you can try a standard PIM to retest using an alternate channel.