RadioBanter - View Single Post - Relationship Between Antenna Efficiency and Received Signal Strength

Jerry Stuckle · January 25th 14, 01:32 AM posted to rec.radio.amateur.antenna

On 1/24/2014 5:10 PM, wrote:
On Friday, January 24, 2014 7:21:42 AM UTC-6, Jerry Stuckle wrote:

Low antenna efficiency affects not only the received signal, but the

received noise.

Of course. I've already said that several times. But they effect
both equally, so the s/n ratio will stay the same assuming the
overall level is overriding the recv internal noise.

And my point was - the overall level may NOT be overriding the
receiver's internal noise. And to be perfectly accurate, ANY lowering
of the external signal decreases the S/N ratio because the internally
generated noise does not change. But I also understand what you're
getting at.

And yes, many inexpensive "modern" receivers suffer from poor front

ends.

Most will be good enough not to see the problems you are
mentioning though. Like I say, you'll have to see almost
nothing at all from the antenna system to have that problem.

Even my dinky mobile antennas greatly swamp the internal
noise, even on 10m, when using my Icom 706mk2g.

Heck, I've never had or used an antenna system that was
bad enough to see the problem you are mentioning.

Yes, most current ham rigs are that good (at least I don't know of any
which aren't). But a lot of less expensive general coverage ("SWL")
receivers aren't.

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