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#27
January 24th 14, 02:42 AM
posted to rec.radio.amateur.antenna
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Relationship Between Antenna Efficiency and Received Signal Strength
On Thursday, January 23, 2014 8:21:27 PM UTC-6, Jerry Stuckle wrote:
On 1/23/2014 7:18 PM, wrote: On Wednesday, January 22, 2014 4:32:31 PM UTC-6, Irv Finkleman wrote: Q. Is there a relationship between the efficiency of an antenna and the received signal strength? Signal to noise ratio, very little. Received signal level vs a more efficient antenna, can be quite a bit. But if the s/n is appx the same, no biggie.. Lower level on the S meter, but things should sound about the same when listening to it. You forgot the noise generated by the receiver. With a weaker signal, the S/N ration will be lower. That would be an issue on VHF/UHF. We are talking HF here. On HF, external noise picked up by the antenna is almost surely going to greatly swamp any internal receiver noise. Assuming a decent receiver anyway, and the one he has should be fairly good. That's one reason why I say if the background noise increases when connecting the antenna, it should be good enough. If it doesn't, there could be a problem. But it will take a really dead antenna system to be like that on HF. Even just sticking a 5 feet piece of wire into the center pin of a decent receiver will cause the noise level to increase, and thus be a fairly viable antenna. Not that it's going to pick up everything, but it should pick up quite a bit. Note the portable SW radios with short whips, etc.. |
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