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How To Modulate a H24
Posted 15 February 2012 - 12:58 AM
Posted 15 February 2012 - 01:06 AM
Is that what you're trying to do?
Posted 15 February 2012 - 01:58 AM
Posted 15 February 2012 - 07:25 AM
Inserting URLs isn't working for me, so do a Google search for "CahnnelPlus'.
Edited by jdspencer, 15 February 2012 - 07:36 AM.
Posted 15 February 2012 - 11:43 AM
Thanks now heres the 64k question they have 3 channels they have their own feeds on will these mods work the same way? thanks again for the input
The things to consider are the output power of the existing modulators so you can "balance" the one you add in. This would also mean modifying the way the existing mods are combined. Could be a simple 3way splitter where you would just replace it with a 4way.
What kind of modulators do they have now? How long is the cabling? How many TVs?
Could replace them all with the device VOS posted a link to but may need an amplifier on its output if there are many TVs or the cable runs are long enough. If the overall runs are short or there are not that many TVs then that mod would work fine on its own. This would be practical if all the existing equipment is in the same place.
Posted 15 February 2012 - 11:50 AM
If you are looking at doing 2 or more channels at the same time, you will need 2 or more recievers and then this channel Plus will work or you can also get a commerical grade demod and out put combiner to do the same job.
Posted 15 February 2012 - 05:37 PM
Posted 16 February 2012 - 10:36 AM
You can get a used commercial modulator that will have enough power to get the signal to the TVs without any snow. Here's an example:
This is a very nice modulator that probably cost A LOT when it was new. Its got some features that may not be good for the OPs situation. The main thing that jumps out on that one is its got a HIGH output. That kind of output assumes you are going to eat up a lot of the gain through the various combiners at the headend. The level adjustment on commercial mods like this are usually only 10dB so running it at the lowest setting will put out over +50dBmV. Combining 4 modulators with a 4way splitter will drop that to +43dBmV. Unless we are talking about feeding 30+ tvs or the cable runs are many hundred feet you will have to pad the level down with something like these:
Im only posting that as an example not saying that is the values you need. You would actually want a handful of these at various values which range from 3dB to 20dB and they can be daisy changed if necessary. This is also necessary to balance the level with the other channels which it sounds like the OP is saying already look weak. In the case of this mod you would probably end up with too strong of a signal which is always a worse picture than too weak.
If I was doing the job I would use equipment like the ebay link, but in the case of this particular job and lack of OP having an RF meter it might be a good idea to use the one posted before that did 4 channels so all the sources go to the same device and all channels get output at the same level. Then if the signal was not strong enough for the number of TVs and/or there is a lot of cable loss you could get a general purpose amplifier to make up for the splitter and cable loss.
If you could get me the actual layout and splitters and approx distances on the cabling we may be able to give you some better advice.
Posted 16 February 2012 - 07:09 PM
Posted 16 February 2012 - 08:39 PM
Does jdogi70 realize that these recommended modulators do not develop an HD signal? How much are the cheapest zee vee mods these days? Still close to $1,000?
The zeevee model that does 1080i still costs +$1000.