TeeVee over Fibre
in [Design]
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From: Joerg on 12 Apr 2010 17:27 David Lesher wrote: > Oh learned s.c.d; the source spring of all knowledege; I humbly > request a very small smidgen of your wisdom..... > > TV over fibre -- No, not the stuph Verizontal sells.... > > I have a friend & client building a log cabin in the woods. > (To set the scale, the [indoor] pool is 80Kgallons.) > > It's 1200 ft to where the solar array and satellite dishes will > be. My question is: who if anyone makes the electronics needed > to convert to glass for both video down and any data back up? > > I have as little to do with TV, much less satellite TV, as > possible; I assume you can use one dish on multiple receivers, > which implies the feed from the dish is at some IF but is > broadband of many megahertz. > > (The alternative is the channel selection takes place at the > dish; which would one channel at a time. I understand that's how > SBC's U-verse is set up; the settopbox actually sends channel > commands back to the 29-B coffin..) > > I welcome enlightenment. Why not use Airflex or Ecoflex coax if you are worried about attenuation, then equalize at the amp? Should be cheaper than fiber and less hassle. For the data link I can't imagine that needing more than 1200bd so CAT5 should work. But you may have to splice that since ordinary spools only contain 1000ft. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Paul Keinanen on 12 Apr 2010 17:30 On Mon, 12 Apr 2010 22:55:41 +0200, Sjouke Burry <burrynulnulfour(a)ppllaanneett.nnll> wrote: >> It's 1200 ft to where the solar array and satellite dishes will >> be. My question is: who if anyone makes the electronics needed >> to convert to glass for both video down and any data back up? >There is no advantage in fiber for a direct connection this short. The first thing I would worry about is the lightning protection at such distances. For a single microwave head for a single polarization generates signals in the 0-2000 MHz range, which would require some intermediate amplifiers, trying to run two polarizations and multiple satellites through a coaxial cable, would require amplifiers every few meters. Using WDM, there is no problem of handling multiple orbital positions and two polarizations on a single mode fiber.
From: Joerg on 12 Apr 2010 17:42 Paul Keinanen wrote: > On Mon, 12 Apr 2010 22:55:41 +0200, Sjouke Burry > <burrynulnulfour(a)ppllaanneett.nnll> wrote: > >>> It's 1200 ft to where the solar array and satellite dishes will >>> be. My question is: who if anyone makes the electronics needed >>> to convert to glass for both video down and any data back up? > >> There is no advantage in fiber for a direct connection this short. > > The first thing I would worry about is the lightning protection at > such distances. > > For a single microwave head for a single polarization generates > signals in the 0-2000 MHz range, which would require some intermediate > amplifiers, trying to run two polarizations and multiple satellites > through a coaxial cable, would require amplifiers every few meters. > Really from 0 MHz? That would be an inconvenience, else you can place baluns to isolate. > Using WDM, there is no problem of handling multiple orbital positions > and two polarizations on a single mode fiber. > While FO to coax converters are ubiquitous the converters from coax to FO are probably expensive. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: David Lesher on 12 Apr 2010 18:32 Copacetic <Copacetic(a)iseverythingalright.org> writes: > You can make it fiber if you convert everything to a network stream at >the feed end and back to video/data/all else on the receive side. >Essentially placing a server at the signal source, and use a media server >in the home to pull streams from it. > Use 10GbE or 100GbE over fiber. > There will be no inexpensive method to pipe the streams you want, the >way you want. I just hope you know that. No, I don't know that. Lots of video is run over fiber in many forms. [Belden just bought one company that does that at sporting events...] When I last looked at broadband video over fiber 15+ years ago, it was doable but pricy. Now, I don't know that's even still true. True, if we turn it unto TCP/IP at the head end; it's straightforward, but that will need MythTV or similar at each set. I'm aware of an ASTV tuner with internal web server that does that encoding, but is the Satellite TV system feed really ATSC, QAM, or something else? -- 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: David Lesher on 12 Apr 2010 18:43
Paul Keinanen <keinanen(a)sci.fi> writes: >>> It's 1200 ft to where the solar array and satellite dishes will >>> be. My question is: who if anyone makes the electronics needed >>> to convert to glass for both video down and any data back up? >>There is no advantage in fiber for a direct connection this short. >The first thing I would worry about is the lightning protection at >such distances. Give the man a prize. That's the first reason why I'm big on fiber here. We'll have multiple strands between the two locations as well as the 4160 vac. We can dedicate what's needed to this. I'm also concerned re: duct space and the hassle of that long run of coax. ISTM some systems require multiple coaxes to the dish as well. >Using WDM, there is no problem of handling multiple orbital positions >and two polarizations on a single mode fiber. Not sure if they'll need >1 bird, but there shall be multiple sets; he'll have [by then...] teenage daughters.... -- 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 |