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Local HDTV Info and Reception Learn about your local HDTV stations, availability, reception issues, OTA antennas and any other local issues. |
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#1 |
High Definition is the definition of life.
Thread Starter
Join Date: Oct 2005
Posts: 176
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Is there specific thread giving an in depth explanation on splitters/combiners?
I have been looking about and have not come up with anything. I know there is a lot info scattered about. I am looking for something consolidated. If somebody could point me to some comprehensive information that would be great. Or a specific page on the net. I require some clarification on when and what type of splitters should be used and not be used under given circumstances. Also looking for information concerning which splitters within a given companies line are considered the best quality where factors such as insertion loss and noise are concerned. Are there any there any threads concerning testing of splitters using spectrum analyzers. Rabbit73 has been nice enough share some testing he has done. Which I greatly appreciate. The reason I am asking this is that I am going to trying various combinations of antenna's including separate VFH Hi and Lo along with separate dedicated preamps for the VHF and UHF sides. Thank you. |
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#2 |
HDF SUPER-MODERATOR
Join Date: Aug 2005
Location: Brooklyn..It's not a Place, it's an Attitude, & LI,NY
Posts: 23,621
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Unfortunately, there is no 'dedicated' thread re: Splitters/combiners etc. Sorry.
Monoprice.com used to have some helpful descriptions on their site www.monoprice.com |
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#3 | |
High Definition is the definition of life.
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Join Date: Oct 2005
Posts: 176
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#4 |
High Definition is the definition of life.
Join Date: Dec 2013
Posts: 79
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Channel Master has a pretty good page on splitter loss.
https://support.channelmaster.com/hc...gh-A-Splitter- |
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#5 | |
High Definition is the definition of life.
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Join Date: Oct 2005
Posts: 176
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Good info. What I am looking for though is which splitters are of better quality and will degrade the signal quality and strength the least. As well as propper application there of. |
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#6 |
High Definition is the definition of life.
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Join Date: Oct 2005
Posts: 176
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Lets look at it this way.
I was just introduced to Dx'ing. Looking to optimize the antenna system. As mentioned in another thread I will be modding a HD8200U to power the VHF and UHF separately. I will either combine behind the preamps or behind their power sources. Also. I will be stacking a VHF-Lo, VHF-Hi, And two yagi's or 2 DB8e's. I am switching out all the circuit boards with ferrite Channel Master baluns that were used on the old 4228's and 4251's. I will be powering the the VHF and UHF antenna's with separate preamps. I have a Winegard AP-3700 for the VHF side and an AP-3800 for the UHF side. I was planning on running 2 drops inside the house and combining behind the preamp power sources using a UVSJ combiner. I was planning on using a Blonder Tongue ZHLSJ in front of the preamp for the VHF antenna's My uncertainty begins as to when it is appropriate to use splitters with power pass, bi-directional, passive and full band. I am also having difficulty finding information on which devices are the most efficient. From what I gather. Blonder Tongue and Holland are the best quality. Followed by the old Macom. Then Pico-Macon and Tru-spec. Ergo why I am looking for some clarification on both what components should be used for the above installations and why. As well as what components have actually been tested by members or elsewhere and been determined to be the most efficient and creating the least amount of noise and loss. |
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#7 | |
High Definition is the definition of life.
Join Date: Mar 2014
Posts: 77
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#8 | |||
It's the Antenna!
Join Date: Apr 2010
Posts: 1,067
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It's important not to confuse a splitter with a UVSJ or a HLSJ. They look alike, but they are very different.
A splitter passes all three TV bands, VHF-Low, VHF-High, and UHF. It is usually used to divide all bands in two to feed two TVs, but it can also be used in reverse to combine all bands from two sources, as from two antennas. A UVSJ (UHF-VHF-Separator-Joiner) and a HLSJ are more properly called diplexers. The prefix di indicates that two bands are being separated or joined. Quote:
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You also must pay attention to balun losses. Conventional all-band ferrite core baluns like the CM-94444 have more insertion loss at some frequencies than others. When I designed a 4-bay bowtie antenna for max gain on channel 15, I tried 21 different baluns and found that the insertion loss difference between the best and the worse was 4 dB. The lowest loss balun is a half-wave coaxial balun, but it is only good for one band and is difficult to construct. You also must consider the noise figure of the preamp. The NF of the preamp directly subtracts from the antenna gain, as does the balun loss. The low NF preamps like the KT-200 are more sensitive to static damage; that is the trade-off, but the internal static-protection devices have improved. Last edited by rabbit73; 02-11-2018 at 05:14 PM.. Reason: corrected balun number |
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#9 | |
It's the Antenna!
Join Date: Apr 2010
Posts: 1,067
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#10 |
High Definition is the definition of life.
Join Date: Mar 2014
Posts: 77
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I have run into people like this Sev before. Sev will never be satisfied, always looking for a antenna with more gain or a uvsj with a little bit less loss. It is a complete waste of everyones time.
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#11 | |
High Definition is the definition of life.
Thread Starter
Join Date: Oct 2005
Posts: 176
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I am also doing a little DX'ing. I have spent far less on antennas and components than I ever spent in a couple of months on Sat. 60.00 bucks here and 20.bucks there for an antenna is not all that expensive. Another 100 bucks for baluns, preamps and combiners. Doesnt add up to 3 months of Sat so far. Then of course there is the money being saved by cutting the cord and streaming over the net. It is far less expensive than spending 2000.00 a pop on the pool cues I used to have custom built. So it is all relative. So far its a far cheaper hobby than others I have had. |
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#12 | |
High Definition is the definition of life.
Thread Starter
Join Date: Oct 2005
Posts: 176
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I have really just begun playing around with antenna's this past year or so. So attempting to gather components that will bring the best results is not unreasonable. The other thing is to avoid wasting money on the wrong components. Have proper knowledge will limit this. Oh by the way I also picked up a nested tilt tower for 100 bucks. So you add another month against the 109.00 a month I used spend on Sat. ![]() I am in a geographically challenged location. And yet have managed to reach out and touch around 73 stations. So my question to you is. Do you have anything constructive to add? Or are you here merely to disparage reasonable requests for information? Last edited by Sev; 02-11-2018 at 12:22 PM.. |
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#13 |
It's the Antenna!
Join Date: Apr 2010
Posts: 1,067
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I love to make TV signal and antenna measurements. I only NEED one signal level meter, but I have four. I don't think I have wasted any money on my antenna experiments because I have learned something from every one.
I'm now 84, and have been doing antenna experiments since I was 8. Life is short; you have to follow your passion and do what you love to do. There is no second chance. |
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#14 | |
High Definition is the definition of life.
Join Date: Mar 2014
Posts: 77
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#15 | |
High Definition is the definition of life.
Thread Starter
Join Date: Oct 2005
Posts: 176
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Also if I am amplifying 2 DB8e's or yagi's. Do I not need a full spectrum power passing splitter/joiner? Would the return be power passing or passive? Last edited by Sev; 02-11-2018 at 06:08 PM.. |
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