A squelch is the circuit that reduces static and excess noise on a wireless receiver or other device. Setting it properly improves audio quality by filtering out unwanted signals.
- Turn the squelch all the way down
First, ensure that the squelch is set to its lowest setting. This does not block the incoming signals and allows you to hear the noise on the open channel. You should also make sure the volume setting, if independent from the on-off switch, is set to minimum.
- Turn on the device
Once the receiver is on, turn the volume up until you hear the hiss of static on the channel.
- Adjust the squelch upward
Turn up the squelch setting until the static sound just disappears. This ensures that weak signals and interference are filtered out. Stronger signals should have enough strength for the receiver to pick them up and let them through.
- Adjust as needed
The first squelch adjustment gets rid of static and interference, but you may still receive weak signals from stations out of range. If these are bothersome, you may adjust the squelch upward further to block them out. However, the higher the squelch is set, the more likely it is to block out legitimate signals.