There is some question as to whether using short runs of 75 ohm makes any difference, with most saying it dosen't. Longer runs would accumulate some attenuation. Mixed runs may introduce problems. Since the receivers are technically 50 ohm, running 50 ohm cable will cause less second guessing if a problem pops up. I've tried swapping 75 and 50 on 10 foot loops for fun and not seen any difference in RF strength, although the resolution on the receivers I use is in 5 Db steps, so it may just not show.It should be 50 ohm cable and connectors for antenna (e.g. RG58 cable), correct?
Yes, With RG58 being 68pf per foot and RG8 being 29pf per foot, the capacitive loading is more than halved, so you can run twice as long a run with less of a loss. Ultimately, it is the capacitor effect that kills the signal.RG58 for short runs, RG8 for longer runs.
\the cable that connects the antennas to the recievers is what im asking aboutAre you asking about the BNC connectors themselves or the cable that connects the antennae to the receivers/antenna distribution?
Yep BNC = BNC And if you're using two shark fin receiver antennas be careful to use one horizontal and the other vertical. At UHF polarization matters and we had a lot of drop outs until we noticed both had been installed horizontally and corrected it.
Yes, one never knows what direction the antenna on a body pack or handheld will be facing! 90 degree rotation on the receiving antennas provides the diversity to pick up the signal at any angle. That's why even when using the stick antennas you want them at pretty good opposing angles.And if you're using two shark fin receiver antennas be careful to use one horizontal and the other vertical.
I built this the other day to get the antenna's out of the rack and into a line-of-sight position.
True more for transmitting than receiving, thus the "Antenna Farm." I have one rack with 12 antennas sticking out the back. They don't really seem to care. Every metal object is a receiving antenna when you think about it. The signal doesn't know it is not being monitored In other words, the rack, rails, audio cables, power cables all have the same effect as additional antennas.Without using an antenna distro system, you’ll do better getting the antennas and receivers separated a lot more than the distance your harness allows. Example - we improved performance significantly for a school with a pile of Shure PGXs by creating a mounting solution to space them 1 meter apart across the front of the (fortunately wide) booth. Esp. True for lower price point receivers with not super-great shielding... the intermodulation distortion potential decreases approx with square law /2 as spacing increases. Similar applies to individual antennae ... too close and they interfere. Also beware reuse of longer leftover antennae from older decommissioned receivers that operated in different bands. Found a church system full of those recently.
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