Originally posted by DemonLee
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Co-Phasing CoCo's with DVB-T's
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Originally posted by Responder View PostMany thanks K5TED for your reply. I understand what you're saying. I would need approx 40 feet between my antenna's and so, this wouldn't work.
So, I'm gonna have to do what rueckwaertsflieger suggests and cut the tree down - well, just the top 5 feet anyway. Chainsaw Time haha
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Originally posted by K5TED View PostPhased antenna arrays are certainly not uncommon, or solely in the realm of CB. Antenna stacking is typical in all sorts of radio communications applications, and relies on phasing harnesses to bring it all together.
The problem here lies not with the concept of phasing your vertical antennas, but the fact that phasing relies on precise lengths and spacing based on a fraction of wavelength. Because 1090MHz is such a high frequency, your phasing harness would be only inches in length, not feet. At that frequency, even a tiny imperfection could result in an out of phase system, effectively cancelling out signals. The physics involved wouldn't allow you to spread the antennas far apart.
So, I'm gonna have to do what rueckwaertsflieger suggests and cut the tree down - well, just the top 5 feet anyway. Chainsaw Time haha
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Originally posted by Responder View PostRemember back in the day, when we had Citizen Band Radio's and to get that extra distance, we used to Co-Phase 2 identical Antenna's approx 10 feet apart?
Can the same apply with CoCo's into a single NooElec DVB-T2 dongle or would it fry the dongle due to too much data coming into it?
I have a good 270 degree coverage with my single CoCo at the rear of my house but I also have a high conifer tree in front yard, which is blocking the remainder 90 degrees and it is impossible for me to push my current antenna any higher and so, I thought about putting an identical CoCo in the front yard and probably Co-Phase the two together into one dongle, so that I have full 360 degrees coverage.
Is it possible?
The problem here lies not with the concept of phasing your vertical antennas, but the fact that phasing relies on precise lengths and spacing based on a fraction of wavelength. Because 1090MHz is such a high frequency, your phasing harness would be only inches in length, not feet. At that frequency, even a tiny imperfection could result in an out of phase system, effectively cancelling out signals. The physics involved wouldn't allow you to spread the antennas far apart.
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By far nothing compares to CB when it comes to wonders driven by myths. You won't get any improvement by whatever phased antenna array unless you place one of it beyond the conifer. If you can't go beyond cut the tree.
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Co-Phasing CoCo's with DVB-T's
Remember back in the day, when we had Citizen Band Radio's and to get that extra distance, we used to Co-Phase 2 identical Antenna's approx 10 feet apart?
Can the same apply with CoCo's into a single NooElec DVB-T2 dongle or would it fry the dongle due to too much data coming into it?
I have a good 270 degree coverage with my single CoCo at the rear of my house but I also have a high conifer tree in front yard, which is blocking the remainder 90 degrees and it is impossible for me to push my current antenna any higher and so, I thought about putting an identical CoCo in the front yard and probably Co-Phase the two together into one dongle, so that I have full 360 degrees coverage.
Is it possible?Tags: None
Leave a comment: