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Oh, he also said that the high gain preamp wasn't recommended.
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Yes, I understand. Channel Master is very cautious about the 7777 because many users bought the 7777 and were upset when it overloaded. The new 30 dB gain 7777 overloads more easily than the old 24 dB gain 7777. They should have left well enough alone instead of redesigning the 7777. What really irritated us techs was that they kept the same model number as if to trade on the good reputation of the old 7777.
http://www.channelmaster.com/TV_Ante..._p/cm-7777.htm
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The Titan 2 High Gain Preamplifier is recommended for professional installers only. Due to the high gain output of this product, it can result in over amplification if not used in the appropriate scenario. Over amplification can cause issues with the television tuner’s ability to receive and display some or all channels.
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MikeBear was using a 7777 with his antenna that was just below the tree tops, and it was working OK. When he raised his antenna for CH 12 to just above the tree tops his 7777 didn't work. He thought it was broken, but it was just overload and was OK.
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Originally Posted by MikeBear
Turns out my new model CM7777 pre-amp is actually fine. Raising the antennas higher caused the signal level to go high enough that it got swamped out. I'll keep it for a spare, and use attenuators in front of it if need be.
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post
http://forum.tvfool.com/showpost.php...2&postcount=49
page
http://forum.tvfool.com/showthread.p...2742#post52742
Since you seemed to be willing to take a gamble for improvement, I made a judgment call after looking at your tvfool and fmfool reports, hearing that just a little more gain helped, and thinking that your signals might be weaker than shown in your tvfool report because of the trees.
It's your time, money, and antenna system. You get to make the final decision. The fact that the wet trees blocked the signals even more confirms my estimate. You can always insert an adjustable attenuator between the antenna and the preamp to find the optimum point between not enough and too much gain.
MikeBear was having power line noise that interfered with his channel 12 reception, and found the source. Interference from power line noise is very common on VHF-High.
You might want to read his thread because your problem is very similar to his. It might give you some new ideas.
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