TeeVee over Fibre
in [Design]
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From: VWWall on 13 Apr 2010 01:45 David Lesher wrote: >>> It looks like 200' is the max for unamplified LNB cable runs. Even with >>> low loss cable and amps mid way, it still may not work well. Then you >>> need to power the amps, etc. > >> IIRC Ecoflex is around 11-12dB per 100m at a GHz, so you'd lose 40-50dB >> over this run. Doesn't sound so terrible if amplified and equalized >> correctly. Amps can't be that expensive, for regular UHF I've got >> several in the basement here to drive coax runs. > > But that leave me with my isolation concern. > You also have to supply power to the LNBs. This is normally done through the co-ax, but might be a problem with a long run. > >>> But, someone does make LNB-Fiber links >>> <http://www.dawnfiber.com/auto_links/pdf/FSS-95F5T.pdf> He should call >>> them to see if it will work in a consumer application. > Be aware that with this method you need an optical fiber for each LNB. You also need power for the fiber transmitter and the LNBs. The unit described above provides the LNB power. There is also a "switch" that routes the output of the required LNB to the requesting receiver. This can be at the receiving end of the optical links. There are systems that "stack" all of the LNBs outputs on one fiber. This requires that that they be "un-stacked" before the receiver switch. >> Sez reasonable pricing, whatever that means :-) > > $1200 and up... > He'll need three circuits with power supplies at each end. This will serve several TV receivers with the normal switch. Dish and DirectTV use slightly different systems, but they both require multiple LNBs and a way to allow all TV receivers to access the correct one. >> But if the guy has a 80,000 gallon indoor pool it'll all be chump change. > > If he spends all his money on this stuff; there will be no pool.. It would be a lot easier and cheaper to put the dish closer. -- Virg Wall, K6EVE
From: David Lesher on 13 Apr 2010 02:53 VWWall <vwall(a)large.invalid> writes: >> But that leave me with my isolation concern. >You also have to supply power to the LNBs. This is normally done >through the co-ax, but might be a problem with a long run. The dish will be at a location with power; the same place the solar arrays are.` >Be aware that with this method you need an optical fiber for each LNB. >You also need power for the fiber transmitter and the LNBs. The unit >described above provides the LNB power. There is also a "switch" that >routes the output of the required LNB to the requesting receiver. This >can be at the receiving end of the optical links. >There are systems that "stack" all of the LNBs outputs on one fiber. >This requires that that they be "un-stacked" before the receiver switch. How did we get to multiple LNB's? >He'll need three circuits with power supplies at each end. This will >serve several TV receivers with the normal switch. Dish and DirectTV >use slightly different systems, but they both require multiple LNBs and >a way to allow all TV receivers to access the correct one. Gads. Is that why their stock setup has multiple coax's? >It would be a lot easier and cheaper to put the dish closer. Hardly. Rule 1: the dish has to be be able to see the birds. You can not do that from within the forest; you can from outside it. -- A host is a host from coast to coast.................wb8foz(a)nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
From: Copacetic on 13 Apr 2010 03:11 On Tue, 13 Apr 2010 04:17:19 +0000 (UTC), David Lesher <wb8foz(a)panix.com> wrote: >> I have an Acer Aspire Revo "nettop" computer that was $200. It is >>running "XBMC" (X Box Media Server). That runs under windows or Linux, >>and is what most folks are using for media these days, not MythTV. > >Still a reach for teenage daughters.... Huh!? It has a menu that has five entries: Weather Music Video Pictures Programs Pretty simple. Even a cave man can do it. You must have raised some pretty dumb daughters.
From: Joerg on 13 Apr 2010 10:31 David Lesher wrote: >>> It looks like 200' is the max for unamplified LNB cable runs. Even with >>> low loss cable and amps mid way, it still may not work well. Then you >>> need to power the amps, etc. > >> IIRC Ecoflex is around 11-12dB per 100m at a GHz, so you'd lose 40-50dB >> over this run. Doesn't sound so terrible if amplified and equalized >> correctly. Amps can't be that expensive, for regular UHF I've got >> several in the basement here to drive coax runs. > > But that leave me with my isolation concern. > That's what baluns were invented for :-) As a kid the cheapest ones I made consisted of cutting the coax, looping in back at a 1" or so radius, soldering center to shield, do same with other side, tape together. Of course, first you must go from Aircell to something more pliable. > >>> But, someone does make LNB-Fiber links >>> <http://www.dawnfiber.com/auto_links/pdf/FSS-95F5T.pdf> He should call >>> them to see if it will work in a consumer application. > >> Sez reasonable pricing, whatever that means :-) > > $1200 and up... > That's not too bad but you'd also have to factor the cost of the fiber versus the coax. The coax won't be cheap either. >> But if the guy has a 80,000 gallon indoor pool it'll all be chump change. > > If he spends all his money on this stuff; there will be no pool.. Got to make choices :-) I don't quite get it why teenage daughters all need their own sat channel choices. Time to get family life back into families ... -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 13 Apr 2010 10:32
David Lesher wrote: > VWWall <vwall(a)large.invalid> writes: > [...] > >> It would be a lot easier and cheaper to put the dish closer. > > Hardly. Rule 1: the dish has to be be able to see the birds. > You can not do that from within the forest; you can from outside > it. > A big Stihl or Jonsered chainsaw would take care of that. This would also drop the heating bill for the next 4-5 years to close to zero. Just kidding :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |