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183 posts

Master Geek


Topic # 25667 28-Aug-2008 16:07
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I have 2 tv tuner cards now (HVR-3000 & HVR-2200) and need to split the signal in two. Would like your help on deciding the best option.

My setup is uhf aerial -> triplexor -> 4-way splitter -> tv tuner card.
I get 100% signal quality on all 3 mux according to ScanChannelsBDA v2.4.4

RG6 Dual Shielded cable used. 5m from triplexor to 4-way splitter. 9m from 4-way splitter to tv tuner card.

Should i use an amplifier before 4-way splitter and 2-way splitter between 4-way and tv tuner card?
Or
should i go with a 2-way amplified splitter between 4-way and tv tuner card?
was thinking of getting either of these 2-way amplified splitters.
http://www.sadl.co.nz/view/distribution_amplifiers/kingray_sa162f_splitter_amplif.php
http://www.dse.co.nz/cgi-bin/dse.storefront/en/Product/L4219?id=se



p.s What does "power pass" mean? It's on my 4-way splitter. Should i be using that output for freeview hd terrestrial?

tia,
charley


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  Reply # 160515 28-Aug-2008 17:18
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You're best with a 5 way splitter i think.
Power pass means that the power from the power injector for a masthead amp can go through it.



183 posts

Master Geek


  Reply # 160599 29-Aug-2008 00:29
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Ah yeah the 5-way splitter. Should i go amplified or is that over kill. My current signal seems to be on the edge with the hvr-2200 tuners.

If i used an amplifier would i want the freeview signal using the Power pass output?


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  Reply # 160607 29-Aug-2008 07:13
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Dont amplifiy until you are convinced you must, COFDM prefers a lower cleaner signal rather than a louder noiser one. Amplifiers normally cause more issues than they fix.

Not knowing how much signal is available where you are, but unless you are on the edge of a coverage region its very unlikely that you should need a amplifier with 15m of cable and a 4way splitter plus triplexer. This has a total loss of around 6dB, most amplifiers have a miniumum gain of 20dB, I see overload on its way.

What is your location, what antenna do you have.

Cyril



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Master Geek


  Reply # 160644 29-Aug-2008 10:06
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I'm up on a hill and have clear line of site to Kopukairua transmitter. I'm using a very old low gain uhf aerial. Has around 20 elements. Not X shaped like these newer ones. But yeah i really need one of those hardware signal testers but they cost to much.

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  Reply # 160652 29-Aug-2008 10:15
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Hi, so you have clear line of sight, and a 20element antenna, or do you mean 9element in real yagi terms, which is quite sufficient for most situations. My guess is try without an amplifier, if the quality/BER figure on any of the tuners does not dramatically drop off then leave well alone. As I said DVB-T appears to work well at significantly lower levels that analog would have been unwatchable.

What kind of distance are you from the Tx, google maps is wonderful. And yes a DVB-T meter is pricey, could have purchased 3 or 4 FV|HD STBs for what I paid for mine, but its worth every penny and earned its keep in the few months I have had it.

PS: my home town is Te Puke, and worked for the BCNZ at Te Aroha in the days that Kopukairua was installed, so reasonably farmilar with the area.

Cyril



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Master Geek


  Reply # 160692 29-Aug-2008 11:49
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I did a proper count and it has 18 single bars attached to a rod. Then there's 4 larger bars at the back in a concave shape. It was installed when we had sky over 15 years ago. The cable from uhf aerial to triplexor isnt even rg6 lol. I used the freeview tauranga map as a guide to distance from transmitter and we are about 22km away. Clos eenough to see the transmitter
p.s We are in green area of map, freeview coverage "very likely"

Would a 5-way splitter be better than connecting a 2-way splitter after the 4-way?

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  Reply # 160714 29-Aug-2008 13:12
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A two way then a 4way will have pretty much the same loss (within a couple of dB) as a 5way, which is infact a 6way. So 6 of one, half dozen of the other.

Cyril

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