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932 posts

Ultimate Geek

#268442 19-Mar-2020 22:03
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Am helping a friend who's just bought a house setup Freeview|HD - assumed it would be a simple antenna install, turns out there is no antenna at all on the house, but there is 75ohm coax in the walls, I think it's RG59 going from two points in the house up to the ceiling, where it's been cut. I'm assuming this used to go to an analogue aerial which has since been removed.


Using the coax that's there as a pull string for RG6 looks to be a pretty serious mission as it isn't moving in the wall cavity even when pulled pretty hard. 


Question is - if I can track down some rg59 connectors, can we use the cable that's already there for Freeview|HD, or do we really need to get some RG6 run? Thanks. 




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1004 posts

Uber Geek

  #2441819 20-Mar-2020 07:39
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If you are in a good reception area RG59 is fine, if I recall there is not alot of difference between RG59 and RG6. I have done satellite with RG59.


The coax may have been run and not used, if it has been used make sure there is no water ingress. that used to be an issue with people not installing antenna and baluns correctly.



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Ultimate Geek

  #2441820 20-Mar-2020 07:42
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Thanks very much. Think we'll at least give it a go with the cable that's there first.


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  #2441830 20-Mar-2020 08:04
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RG59 is totally fine unless you're in a really poor signal area.


Only thing to factor in is that typically RG59 installs typically had poor connectors and if there is a splitter it'll be really crap. If you're looking at multiple TV's tidying things up might be necessary.



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Uber Geek


  #2441882 20-Mar-2020 08:14
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Hi, the biggest issue with RG59 (assuming you have adequate signal in the first place) is it has less sheilding (in addition to higher loss) compared to RG6.


Due to this inferiour shielding internationallly there were early issues with other home appliances (switch mode plug packs etc) that caused issues for VHF DVB-T signals distributed on RG59, as we use UHF only in NZ this issue was not as much an issue here.


So end of story, it has higher loss than RG6, and less sheilding, if you have adequate signal arrive at the TV then you all good to go. I suggest you hunt around for RG59 F connectors, dont use RG6 ones they wont fit properly.



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Uber Geek

  #2441991 20-Mar-2020 11:40
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As @cyril said, but also note the higher loss is per metre so long runs are a bad idea.


Also note the loss becomes worse at increased frequency so RG59 will not work so well for satellite dish use ( that's just FYI , I saw you said FreeView HD).

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Ultimate Geek

  #2458075 9-Apr-2020 11:31
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Just a quick update on this - managed to get the gear shipped to my friend the day before the lockdown (antronic1 on TradeMe was very helpful - supplied antenna, a pre-made RG6 cable to go from antenna into ceiling cavity, mounting hardware, RG59 ends and a splitter for a sensible price). Friend was able to get the antenna installed with some help over Facebook video chat haha (side note, I never realized how awful Facebook video chat is), got the pre-made RG6 run from the antenna into the ceiling cavity, and then connected the splitter to the RG59 that was already run. I should have got a f-connector joiner so it could be used without the splitter, but there seems to be good enough signal even going through the splitter. 


The only weird thing is he's not able to get Maori TV. He's said all the other channels are fine, but an autotune won't pickup Maori. Any ideas on that?

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Uber Geek


  #2458080 9-Apr-2020 11:37
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Hi, Maori TV is on their own mux called the MTS mux, this carries MaoriTV plus Te Reo, in some locations the MTS mux may be transmitted from a different location to all the other Mux's so antenna alignment may effect the outcome.


What is the location.




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Ultimate Geek

  #2458087 9-Apr-2020 11:44
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Ah, I bet it is something to do with that then. So he's in Richmond, but LOS to Mt Campbell is blocked by a hill so has antenna pointed at the Kaka Hill transmitter - the other houses nearby all have antennas pointed at the Kaka Hill transmitter too which is why we went that way. 


I could get him to change the polarity to horizontal and direction to Mt Campbell and try a re-tune to see if there is enough signal?


Edit - just heard they get Te Reo so maybe not that issue?

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Uber Geek

  #2458619 9-Apr-2020 19:33
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Kaka Hill is H pol , Mt Campbell is vertical


If they use MT campbell they should also pick up the 8 mainland tv channels as a bonus





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Ultimate Geek

  #2458622 9-Apr-2020 19:36
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Yeah sorry, got that backwards. The antenna is definitely aligned correctly.

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