There might be complications even with the CM LTE Filter added
The CM 3201 will keep the channel 60 to 69 signals from reaching the antenna.
However, since the CM 3201 LTE filter is a low pass filter, it will not keep spurious signals from the modulator that are below channel 60 from reaching the antenna. Also, if your modulator IS producing spurious signals below channel 60, they will interfere with your OTA signals from the antenna. You would need a spectrum analyzer or signal level meter to check for spurious signals below channel 60 from YOUR modulator. If they exist, you would need a custom high pass filter at the output of your modulator to block them. Otherwise, your modulator would be considered an illegal unlicensed transmitter. The advice from ADTech is correct: Quote:
Quote:
https://www.fullcompass.com/common/f...UserManual.pdf https://i.imgur.com/pj7ICuO.jpg The way I prefer to handle the problem of two antennas aimed in different directions is to connect the main antenna to the antenna input of the TV and connect the second antenna to a separate tuner with its output connected to the aux input of the TV; no modulator is required. |
I agree that the problem is likely spurious signals caused by the three strong signals created by the modulator. I don’t know if the problem is internal to the modulator or caused by excessive amplification of the modulator.
If the problem is created internal to the modulator, a high pass filter will help, but could also be reduced by additional attenuation of the modulator output before combing with the OTA signals. Another approach to the same problem would be to amplify the OTA signals before combining them with the modulator output. It may be necessary to do some of both to achieve the desired results. When I looked up the output level of the modulator I was astonished how strong the signals were. They are strong enough to drive long cable runs and splitters. I don’t understand why you have a distribution amplifier to further amplify the extremely strong modulator output. I’m almost certain that the distribution amplifier is overloaded by the modulator. An overdriven amplifier will generate intermodulation products that fall into the OTA UHF band. I can’t figure out how the intermod caused by the overdriven amplifier is getting back into the feeds that are not being amplified. Perhaps the amp is overdriven on its input and feeding intermod back into the modulator. To understand your dilemma, it would be helpful if you completely disconnected and unplug the distribution amplifier while you try to find a way to combine the the modulator with the OTA antenna. |
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