When you receive your CM-7778HD, the 'default switch settings' are;
- FM Trap switch = IN/ON position
- Combined/Separate switch = Combined position
- High/Low switch = Low position
If you want to change operation selections, please refer to your instruction guide to locate the correct switches. You can gain access to the 3 switches by removing the 4 screws and lifting the In/Out panel out of the housing. If the rubber seal becomes dislodged when you open it, make certain that you return it to the trough, to ensure a proper moisture seal.
- UHF input port signals in 'Separate' switch position.
- When 'Separate' is selected, the UHf port will pass UHF signals only.
- When 'Separate' is selected, the VHF port will pass VHF signals only.
- UHF input port signals in 'Combined' switch position.
- When 'Combined' is selected, the the UHF port will pass both VHF and UHF signals.
- When 'Combined' is selected, the VHF port is disabled.
- FM Trap ON/OFF switch position.
- If you have an FM transmitter near by, it can cause interference to channels 6 & 7. (If strong enough, it can affect others as well.)
- In the IN/ON position, the FM trap will block the FM signals.
- In the OFF position, it will allow the FM signals to pass and be amplified.
- High/Low gain signals switch.
- You have a choice of 17dB Low gain, or 30dB High gain.
- The 17dB setting is used for most installations.
- The 30 dB setting would only be used if you have all weak signals in your area and you have very long cable leads to multiple TV's.
- You want to use as little amplification as is possible.
- Too much gain/high signal levels, can actually hurt your signals.