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19110 posts

Uber Geek
+1 received by user: 3242


  Reply # 649979 3-Jul-2012 11:58 Send private message

You will have massive losses with both the reverse splitter to combine things and then an 8 way, also the modulators are not always very clean with their output so try moving it around even if its not on a channel that should interfere.


6272 posts

Uber Geek
+1 received by user: 457


  Reply # 649983 3-Jul-2012 12:01 Send private message

Drop everything out and start working backwards, reintroducing items until it breaks.

What condition is your aerial in also? Especially the cable connection point. Is it an 'F' connector or saddle/clamp arrangement etc.

The RF combiner coupled with splitters and multiple unterminated fly leads is not looking good. As sbiddle mentions, check you're not RF modulating over a freeview frequency channel you now actually need.

260 posts

Ultimate Geek
+1 received by user: 2

  Reply # 649984 3-Jul-2012 12:01 Send private message

Certainly check your results with the Sky modulator turned off (if it wasn't previously).
It's a pity you didn't post results for the Kordia mux (Maori, Prime or Choice channels) as the even higher frequency might indicate feeder loss rather than a specific frequency being affected.
My first suspician would have been the feeder, but if you're sure your cable and connectors are OK .......
I assume your cable runs aren't extra long, which might call for a masthead amp or your "big mother".
How direct is your line of sight to Waiatarua from your rooftop? Is Sky Tower better, in which case it would be worth trying - or I have a relly in a hollow in Hillsborough who did well using the Remuera infill transmitter. it also uses vertical polarization and the same freq allocations as sky.
Do you have a cordless phone or two? This can make "yelling at the wife" a bit less stressful.

Is your splitter active (powered). If not it's going to reduce your signal strength to about a tenth. (-10db).
Here are some alternatives if you need lots of feeds.
They're a bit pricey, but may be of help to you.

84 posts

Master Geek
+1 received by user: 1

  Reply # 650035 3-Jul-2012 13:28 Send private message

knoydart: So go direct from the UHF aerial to 1 TV, and see what you get on the Mediaworks mux. Your Sky RF modulator should have a display on what channel it is on, does it say 33 by any chance?

The RF Modulator has a 22 on it.

1815 posts

Uber Geek
+1 received by user: 96

  Reply # 650057 3-Jul-2012 13:52 Send private message

Also check your 2 into 1 combiner is suitable for 2 UHF inputs. All the ones I've seen are for combining a UHF with a VHF input.
You could try swapping over the inputs and see what happens.
I'd still ditch it completely and run A/V cabling to feed Sky to the TVs.

84 posts

Master Geek
+1 received by user: 1

  Reply # 650445 4-Jul-2012 09:09 Send private message

Thanks for everyone's feedback. I unplugged the Sky RF Modulator last night, and Ch 1 and 2 on my Freeview TVs signal when from 65% to 100%. Unfortunaltely Ch 3 and 4 didn't change and still pixel. I will get some F-type terminators and put then on the ends of my other cables that I'm not using, and see if this assists. Its a non-powered 8-way so I'll terminate the other 6 not in use. It was nice to have the one Sky channel beamed out to my TVs also. If the signal improves by putting the terminators on, and I check the combiner as one other member suggested, I may fire up the RF Modulator again to see if that break it again.

Much appreciated and thank-you

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