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Multi-receiver/TV systems - Domestic only
3dB signal at LNB, enough for multiswitch?
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<blockquote data-quote="OldBen" data-source="post: 767272" data-attributes="member: 194242"><p>Sorry, see you can tell I am not a pro here ;) its 3.1dB SNR indicated on the meter. The BER is 1.3E^-05. That's on the meter, and of course that may differ between meters? By comparison offset 28.2E is 8dB or so and the transponder programmed into the meter on 23.5 (which is focus) of 11973V is 11dB.</p><p></p><p>3.1dB can't be below reception point, as even after the cable run the TV can pick up the signal ok and I suspect its tuner is a lot weaker than a dedicated receiver as its just designed for freesat on 28.2. In fact the meter can lock the transponder down to an indicated 1.1 or 1.2dB so I would strongly suspect the SNR calibration of the meter is out versus your expectations Huevos.</p><p></p><p>Some of the switches I have been looking at 8 or 12 output switches and they typically quote 0dB insertion, but that does not seem realistic to me? Others seem to quote 2.5-3dB loss.</p><p></p><p>The previous screenshot was from the TV, I strongly suspect its not the last word in tuner sensitivity and that a dedicated receiver will be stronger. I was surprised Robbo how strong it shows the signal. Attached is the diag screen from the TV on a clear channel (will be getting genuine sub card once I am sure reception will be consistent).</p><p>[ATTACH]44376[/ATTACH]</p><p>(EDIT: Note BER is 5^-05 in the screenshot, and this is after cable run to loft and back & join)</p><p></p><p>Now you mention it I do have some attenuators in the box'o'bits I will have to check if they are VHF only or work at 2Ghz and perhaps try those inline.</p><p></p><p>The reason for the question is of course I don't want to buy a quattro's only to find the signal is too weak and I need quads and diseqc switching for main PVR, mind you they are 2-3dB loss spec sheets say!</p><p></p><p>Sounds like there is no more theory, just experimentation!</p></blockquote><p></p>
[QUOTE="OldBen, post: 767272, member: 194242"] Sorry, see you can tell I am not a pro here ;) its 3.1dB SNR indicated on the meter. The BER is 1.3E^-05. That's on the meter, and of course that may differ between meters? By comparison offset 28.2E is 8dB or so and the transponder programmed into the meter on 23.5 (which is focus) of 11973V is 11dB. 3.1dB can't be below reception point, as even after the cable run the TV can pick up the signal ok and I suspect its tuner is a lot weaker than a dedicated receiver as its just designed for freesat on 28.2. In fact the meter can lock the transponder down to an indicated 1.1 or 1.2dB so I would strongly suspect the SNR calibration of the meter is out versus your expectations Huevos. Some of the switches I have been looking at 8 or 12 output switches and they typically quote 0dB insertion, but that does not seem realistic to me? Others seem to quote 2.5-3dB loss. The previous screenshot was from the TV, I strongly suspect its not the last word in tuner sensitivity and that a dedicated receiver will be stronger. I was surprised Robbo how strong it shows the signal. Attached is the diag screen from the TV on a clear channel (will be getting genuine sub card once I am sure reception will be consistent). [ATTACH]44376.IPB[/ATTACH] (EDIT: Note BER is 5^-05 in the screenshot, and this is after cable run to loft and back & join) Now you mention it I do have some attenuators in the box'o'bits I will have to check if they are VHF only or work at 2Ghz and perhaps try those inline. The reason for the question is of course I don't want to buy a quattro's only to find the signal is too weak and I need quads and diseqc switching for main PVR, mind you they are 2-3dB loss spec sheets say! Sounds like there is no more theory, just experimentation! [/QUOTE]
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Multi-receiver/TV systems - Domestic only
3dB signal at LNB, enough for multiswitch?
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