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79 posts

Master Geek


Topic # 15353 17-Aug-2007 19:50
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Hi there I am hoping that someone out there may be able to answer a couple of questions I have.

1/ What is the Min/Max Rf signal levels reqired @ the TV outlet.
2/ What is the Min/Max Sat Signal levels required at the STB.

Is there a standard here in NZ that installers are required to abide by. I Used to do smatv, matv and irs installations in England for a couple of years but that was a while ago and im now a sparky but I am slowly getting back into some rf work and I for the life of me cannot remember what levels were required at the outlets.

I have also noticed people love to use heaps of cables here nearly all of the installs I did in the UK reqired many cables at the headend then everything was combined and pumped down one cable to a diplexd outlet that offered TV, Sat, FM. Is it me or is this type of installation not done here in NZ.

Cheers

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  Reply # 82781 18-Aug-2007 08:17
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Hi Kev, yes there is a standard AS/NZS 1367:2000. I have a redraft as at Sept06 (DR06571), its 152pages and covers things pretty well. Anyhow the following

Figures for WallPlate levels given as min/max in dBuV.

For Single Dwellings: AnalogTV 60/86, DVB-T 45/80, DVB-S 50/86, T-DAB 30/85, FMRadio 45/80

For MultiDwellings with <20 RF Channels: AnalogTV 60/80, DVB-T 50/74, DVB-S 54/80, T-DAB 35/80, FMRadio 54/70

For MultiDwellinng with >20 RF Channels all are the same except AnalogTV and DVB-T have there max levels dropped 3dB.

Hope this helps



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Master Geek


  Reply # 82842 18-Aug-2007 17:35
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Thanks Heaps Cyril I was kind of hoping to get yor input is there any where I can download AS/NZS 1367:2000. I encounted the worst RF installation today gladly I was doing other work but it was a smatv/matv system with loads of screw/not crimped F-Cons. They were the bain of my life when I worked in England whoever came up with those needs to have there head read.

 
 
 
 


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  Reply # 82937 20-Aug-2007 10:43
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Hi Kev, if you PM me your email address you can have this draft, I only have the draft in pdf format but its not a hell of a lot out of wack for you to start with.

As for not using a single feed and diplexers, most recent MDUs have combined V/UHF&LBand, although personally I prefer to keep them seperate. NZ has never really got into the seperate TV and FM diplexing as in the UK, probably a lot todo with the rather late introduction of FM services here.

As for screw on Fconnectors, these definitly dont meet Skys install standards, you must use either Radial crimps or PPC linear compression connectors. Hex crimps are also in my view perfectly fine, although Sky prefer you dont use them. Of all, the PPC linear compression connectors are superiour and current pricing places them only a few cents dearer than hex or radial crimps.

Cyril

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