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Guide to TV antenna installation

Using the Channel Master 7778HD preamplifier

The Channel Master 7778HD preamplifier is one of the best preamplifier's to come along in some time.

It's very versatile, low noise figure, high signal input capacity, steel housing and performs excellent.                  

Channel Master 7778HD installation manual

Hi Denny-

You recommended and I purchased from you, the CM7778HD which has a separate input for a VHF coax and a UHF coax antenna lead.  It appears that there is only one coax lead transformer supplied with the HD Stacker.  Can I just get another equivalent transformer or is there some specs I need to be aware of?  I assume that each antenna lead be connected to the respective input on the CM7778HD.



Hi Steve,

When assembled properly the HD Stacker antenna has a VHF/UHF single output. The CM 7778HD has two switchable input choices. It has the option of VHF/UHF combined input or separate VHF and UHF inputs. The unit comes preset to combined input meaning the single input  labeled "combined" will amplify both VHF and UHF signals. Connect the antenna to the combined input of the CM 7778HD and both VHF and UHF signals will be amplified. The CM 7778HD also has a switchable gain control. In your case supplying multiple TV locations set the gain switch to the high position. Remove the 4 screws on the bottom cover of the preamplifier. You will see 3 switches. One switch will have the option of (L) for low gain and (H) for high gain. Set it to (H). Leave the other two switches as they are set from the factory.

Switch #1. Combined or Separate input. Set to combined the preamplifier input labeled combined will amplify both VHF and UHF signals. Set to separate the preamplifier input labeled VHF will amplify VHF and the input labeled UHF will amplify UHF signals.

Switch #2. FM trap. Factory preset to the (IN) position. If the antenna in use will be used for FM reception set the switch to the (OUT) position.

Switch #3. This is the (High) or (LOW) gain switch.. In weaker signal areas when supplying multiple TV locations set this switch to the (H) position.

Inside view of the Channel Master 7778HD preamplifier with the bottom cover removed.

Inside view of the Channel Master 7778HD preamplifier

Channel Master 7778HD preamplifier

Channel Master 7778HD preamplifier

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