Tuning the PFM R32 & R31 Receivers

Tuning for the R32 and R31 Receivers is determined by tuning coils, and is stabilized by phase- locked-loop circuitry. A plastic tuning wrench (PLT 005) is needed to adjust the receiver tuning coil.

1.Use the Transmitter as a tuning signal source. Have someone speak into the microphone so you have something to listen to.

2.Keep the Transmitter and Receiver about 15 - 20 feet apart while tuning. The receiver must be tuned under weak signal conditions.

3.Open the battery compartment using a coin in the slot in the bottom of the transmitter. Pull up the receiver battery flap to open the receiver back like a book. This will expose the circuit board.

4.Move the channel selector switch to channel 2 (right position).

5.Use Figure 11 below to locate the tuning coils. Use the earphone supplied with the receiver to listen for the transmitter signal while you slowly and gently rotate the tuning slugs inside the tun- ing coil with the tuning wrench. Adjust the tuning coil for channel 2 slowly and carefully. Do not press down on the tuning slug. Adjust for maximum signal.

6.Re-tune all the receivers and mark the new frequency inside the case for future reference.

FIGURE 11: LOCATION OF RECEIVER TUNING COILS

Batteries

Channel 1 Tuning Coil

Channel 2

Tuning Coil

Channel Selector Switch

R31/R32 Receiver