SIMPLE DIY TROBLE SHOOTING [ FAQ ] [ CONTACT ] 

  Situation 1 Transmitter ( DUT ) is ON, Receiver ( DUT ) is ON, but NO RF signal received. ( DUT means Device Under Test )Three possibilities
 

Possibility A¡GTransmitter and Receiver are having different frequencies.
Suggestion¡GIf this is the case, please change either transmitter or receiver to the correct matching frequency or frequency group. For PLL series, if the frequency group is correct, the channel selected could be wrong on either side. Please verify and select the correct channel.

Possibility B¡G The transmitter ( DUT ) is faulty
Suggestion¡GWhen step 1.1 is verified to be correct, then either transmitter or receiver is faulty. To prove this, please use another functional transmitter ( if any ) of the same model and same frequency to switch on the receiver. If this transmitter of the same frequency could trigger on the receiver, then this prove that the other transmitter ( DUT ) is faulty.

Possibility C¡GThe receiver ( DUT ) is faulty
Suggestion¡GWhen steps 1.1 and 1.2 are verified and found no clue, then the receiver might be faulty. To prove this, please use another working receiver ( if any ) of the same model and same frequency to receive the signal from the transmitter ( DUT ). If this receiver could receive signal without any problem, then it proves that the other receiver ( DUT ) is faulty.
   
  Situation 2 A whistling sound is heard when the transmitter is on.
  This is most probably the effect of interference noise.
When interference does happen, switching on and off the transmitter is usually accompanied by a pop sound. To eliminate this problem, try to make the receiver less sensitive, by turning the squelch control ( SQ ) in clockwise direction until the effect disappear. However, higher squelch settings will decrease the operating range of the system. If this effect still persist despite the maximum position of the squelch control, it means the interference signal is too strong and there is no way to resolve this problem. It is advisable to change the system to another frequency and let this system be used at a different location.