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767 posts

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#260271 18-Nov-2019 16:37
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I need to split our aerial feed and have found pixelation issues. The signal goes through a Panasonic DV Recorder then to the TV. 
When I add a splitter the DVR still has a good picture, but the TV is pixelated.
Is there a "active splitter" device I can get that might overcome any losses and keep the Tv picture stable? 


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  #2356878 18-Nov-2019 17:23
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Is that the only split in the aerial feed or is it also split elsewhere?

 

One split wouldn't normally be an issue unless the aerial isn't aligned correctly or the cable from there is damaged causing the low signal to begin with.
All RG6 cabling and decent connectors?

 

What is the splitter you are trying to use?




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  #2356883 18-Nov-2019 17:37
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I should have said there is anther splitter (one I can't get to)...  yes all good cabling and connectors afaik. Some F to Belling lee adapters.

 

The splitter is a no-name one 5-2500MHz "All Ports power pass".

 

 


 
 
 
 


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  #2356939 18-Nov-2019 19:54
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Cable quality between splitters is more important with digital than it was with analog. If you have those horrid wall outlets and splitters with a saddle clamp and screw terminials which were popular among lazy domestic sparkys doing spec builds then replace those first with F ones, and new decent patch cables from the wall to the splitter etc. See if you can just bypass the wall plate if you have them and just screw the splitter to the wall below the plate etc.





Richard rich.ms

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  #2357030 18-Nov-2019 23:17
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I have two TVs and heaps of tuners on 5 PCs, so I wound up using two of these on my aerial system when digital TV came along:

 

https://www.jaycar.co.nz/indoor-tv-amplifier-splitter/p/LT3287

 

There is a two way version of this also (half the price) and there also seem to now be some rather cheaper alternatives.  I have no idea if the cheaper ones work well or not, but they are so much cheaper that it would be worth trying them.  To see them all on the Jaycar site, use google.co.nz to search for "site:jaycar.co.nz splitter amplifier".  Google works better than Jaycar's search engine.  You may be able to get them cheaper from other sites.


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  #2357044 19-Nov-2019 06:49
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Good to see I'm not the only one that has trouble with their search engine.

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  #2357053 19-Nov-2019 07:11
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What do the diagnostics on the recorder and the TV say, with and without the splitter.?

Then with the splitter still in circuit bypass the recorder ( join the two cables together )and recheck the TV diagnostics , i’ve come across those with excessive signal loss.

There is also the possibility that your signal is just too close to the threshold, and the splitter is tipping it over the edge.


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  #2357104 19-Nov-2019 09:29
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I've seen issues where older aerials muck with the Panasonic units... diplexers can strip the VHF out of the signal and fix everything.

 

Or, you may have too little in the way of signal.

 

I'd get a pro to sort it, just saying :-)


 
 
 
 




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  #2357195 19-Nov-2019 11:54
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Thanks for the tip about the amplified splitter, I rang Jaycar and they're happy for me to try one out. There's 7 days right of return.

 

If no good the solution may be to put up a second antenna.

 

I have tried to find a signal strength reading on the TV (Sony KD75X8000G) but can't find one.  A small box connects to the 230 with RF i/o connectors which supplies the voltage to a masthead amplifier. Unplugging it has no effect (to the eye) on the signal so maybe that's not working. You'd expect an improvement with it connected ?  A signal strength reading would be very helpful.

 

 


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  #2357200 19-Nov-2019 12:07
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ADKM:

Thanks for the tip about the amplified splitter, I rang Jaycar and they're happy for me to try one out. There's 7 days right of return.


If no good the solution may be to put up a second antenna.


I have tried to find a signal strength reading on the TV (Sony KD75X8000G) but can't find one.  A small box connects to the 230 with RF i/o connectors which supplies the voltage to a masthead amplifier. Unplugging it has no effect (to the eye) on the signal so maybe that's not working. You'd expect an improvement with it connected ?  A signal strength reading would be very helpful.


 




On Sony TVs, goto customer support then system information, that should show you some quality information

Sony TVs are usually pretty good at handling low signal and are happy with low 40db

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  #2357203 19-Nov-2019 12:10
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If you have an old masthead amp then its probably suffering from LTE overloading it and isnt needed on digital anymore in anycase.





Richard rich.ms

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  #2357283 19-Nov-2019 14:41
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Removing the power to a mast head amplifier would give you no signal at all, so it sounds like that’s not in circuit.



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  #2357309 19-Nov-2019 15:38
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Found out some more..   after discovering signal strength indication on the Panasonic DVR, which the antenna passes though.

 

I had a case where TV3 was ok on the DVR but no signal at all on the Sony. I removed the power to mast head to find that improved signal strength. Then I removed a Band Pass Filer (says Pass Band 498-698MHz and Reject Band 5-450MHz and 750-1000MHz). This also seemed to improve things and picture is nearly perfect now (with 2 splitters in line + the one in the DVR).  Replacing one splitter with the Powered Jaycar amplified one might see it all 100% ?


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  #2357319 19-Nov-2019 16:04
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I'd fix the mast head amp if I were you. There is no point putting a good amp behind a bad amp. Also you ideally want the amp upstream of the first splitter (which a masthead amp is/was) because every split halves the remaining signal.

 

A lot of amps (particularly the ones built into the antennas) have a bi-pass so that if the amp looses power, the un-amplified signal can bypass the amp - it helps to avoid total failure of the system. 




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  #2357341 19-Nov-2019 16:27
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The antenna was changed some years ago (to a phased array), perhaps that didn't put the amp back?  Can I tell from looking up at it?  Rich says they aren't needed... why is that ?


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  #2357424 19-Nov-2019 19:24
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They can still be required but not as often now. Digital will work at signal levels that would have been pretty much snow and noise in analogue.

Often they were put there by Sky installers as it was quicker to put one of those in than re-cable to RG6.
You would have to live in a really poor signal area these days to need one.
If you could find the diagnostics in the Sony that would be helpful as they normally show Bit error rates

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