Quote:
Originally Posted by GroundUrMast
The Holland UVSJ would be appropriate as a combiner when you have one antenna serving only UHF reception and another serving only VHF. None of the satellite diplexers would be useful as OTA antenna combiners. Regardless, I can't see any point in worrying about tenths of a dB of difference between different vendors' UHF/VHF combiners.
If you need to overcome the loss of the UHF/VHF combiner, equip each antenna with a preamplifier of it's own (this would be an extreme situation). The gain of the preamplifier will overcome the noise margin 'hit' of the combiner provided the preamplifier is upstream of the combiner. The same is true of cable and splitter losses. If the preamplifier is upstream of the loss, you can ignore the loss and subsequent cost in NM.
...
|
Technically I don't need to do anything but I'm trying to learn more about noise and signal loss to have a better setup. I'm thinking that I could possibly gain some additional channels with a little more gain, particularly the channels that are closer to me with strong signals and get a couple of channels more regularly that are farther away and only partially come in.
You are correct in that I have one VHF antenna (AntennaCraft Y10-7-13) and UHF antenna (Winegard HD-9032). I have them stacked appropriately and one coax run to my tuner. What I'm trying to understand is that I know I'm loosing about 3.5db by joining the two antennas - will using the UVSJ joiner from Holland reduce that to just 0.7db? In essence, isn't that a 2.8db gain?
If I combine that with a 2db gain by upgrading the coax cable, wouldn't that be a net 4.8db gain to my setup? That might be enough for me to get some less reliable
channels that I receive and perhaps the more local channels that are currently blocked by that one pine tree. I know the signal is there, it's just not strong enough for me to get it regularly. Currently, the weakest stations I can get regularly are -5.5db and I can sometimes get one at -8.6 so just a little gain would give me those channels more regularly. I might also be able get the channels channels in the -12.5db range occasionally so any any little bit helps.
Thanks again....Dave