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[#1] 出售: AudioPrism 6500 FM 天線 (交易完成)    
HK$800

Audioprism's Hi-Q 6500 is a flat box 9 by 9 by 2 1/4 inches. It is designed for FM listeners in large-city downtowns where there are many high buildings; there the problems include too many strong signals rather than weak ones. Its frequency selector knob helps it filter out interfering signals, while another knob tames signals that are strong enough to overload the tuner.

An interesting feature of this antenna is that it is omnidirectional when placed flat on a table or shelf, but when it is set upright on its narrow side it becomes directional. When it is stood up on its side it is claimed that the radiation polar pattern is cardioid in shape. Front to back gain is claimed to be 6 dB. Since it is now directional, it picks up about 3 dB of gain. If you are in an area with strong, interference-free signals, you can leave the antenna flat and do not have to worry about moving it around when changing stations (you still have to tune it—drat). If you have multipath or a strong undesired signal, the 6500 may yield better reception than a dipole or rabbit ears because it does have some front-to-back rejection. Things get a little more unpredictable, though, because the antenna receives the horizontally polarized component of the signal when it is flat but the vertical signal component when it is on its side.
When the signal strength was high enough, the 6500 worked very well in my setup. It almost always equaled or outperformed a dipole or rabbit ears. Best results occurred most often with the antenna on its side. Again, a properly aimed dipole near the ceiling per- formed better on weaker signals, for the reasons cited above. Adding the Radio Shack amplifier or even the Signal Sleuth did not help. AudioPrism never claimed the 6500 was designed for a fringe-area signal


bighead
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2020-06-23 13:27
[#2] 出售: AudioPrism 6500 FM 天線 (交易完成)    
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bighead
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2020-06-29 08:55
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