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Wannabe Geek

#269945 16-Apr-2020 17:15
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The set up is as follows:
I've got a TV with a duel channel recorder box separate to it. The coax cable comes down from the aerial /signal amplifier and into the 'RF in' plug on the recorder box. Another coax cable goes from the 'RF out' plug on the recorder to the tv.

Here's the problem:
In this configuration (how it used to be before we got a new TV) the Signal is stuttery with a broken picture and broken audio when viewing from both the TV itself and through the recorder box. The picture I have posted is of this.

When I connect the aerial cable with the coax going to the TV together so the signal is going straight to the TV, bypassing the recorder, the picture and audio is perfect.
I get the same perfect image and audio when I switch the "polarity" of the coax cables going into the recorder box but no signal at all when trying to view channels through the recorder.

Could this be a problem with the recorder box or am I missing something entirely?

Cheers, Sam

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5977 posts

Uber Geek

  #2463651 16-Apr-2020 17:20
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Can't see any pic you posted, and not sure how you would alter the polarity of the coax, but this sounds like a low signal issue. Signal is probably marginal so works OK with one device connected, but with 2, the levels drops below what is required for the tuner to lock.


Low signal can be from a misaligned antenna, obstruction in front of antenna, cable fault, or a couple of other reasons.

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Lifetime subscriber

  #2463665 16-Apr-2020 17:51
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I'd suggest using an amplified splitter so the TV signal isn't going through the recorder.  Something like this:




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  #2463674 16-Apr-2020 18:16
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You mention switch polarity, that is for satellite.


Make sure you are connecting to the UHF socket ( often referred to as Belling lee ), this is round, not the satellite socket ( which is called a F connecter ) which has a screw thread.


The other thing to check is the cable going between the receiver box and the TV.


What is the model of dual tuner receiver?


Also could you take a picture of the aerial so we can check if it is the correct one.



I know enough to be dangerous

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  #2463697 16-Apr-2020 19:31
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Really need a lot more info here. A photo of the current setup would be useful.


I wonder if there is even a UHF antenna, might be getting just enough signal from the cable going to an LNB.

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  #2464656 18-Apr-2020 12:26
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Assuming UHF, I had this issue with the aerial being the wrong polarity, rotating the aerial 90˚ made the signal much stronger for all the televisions connected to it.

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