|
A signal from real CH-6 would make a fair test signal, it's at the bottom of the FM band.
Real CH-11 is twice the frequency of the FM band center. It's about as bad a choice as one could hope to find because at 200 MHz, the elements of the FM antenna are twice as long as they should be in order to resonate (that actually forms a type of rejection filter). Your test suggests the combined pair rejects real CH-11 better than a single antenna, possibly due to the filter network formed by the coax + combiner harness + antennas.
For the best shot at a balanced combiner harness, use cables of equal length, cut from the same roll of coax. There can be variations between vendors, so that two store bought cable the same length, but from different sources, may not match well enough.
Quad shielding is not worth paying a penny more for... The point of extra shield is to keep signal from getting into or out of coax that's not directly connected to an antenna. (As in the case of a satellite system where there is a low-noise-block converter between the actual antenna and the coax. In a satellite system the LNB shifts the raw signal from the satellite to a lower range of frequencies. The range used in the LNB to receiver connection overlaps with land based radio services. You need to keep the two from interfering with one another, hence the extra shielding.) In OTA TV & FM, you have an antenna coupled directly to the coax, extra shielding buys you nothing, The antenna is a 'huge leak' in the shielding.
__________________
If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
(Please direct account activation inquiries to 'admin')
|