This argument will never die.
But remember the last time you called CQ and a station came back that you could hear, but
not copy. (I'm thinking CW, but it also applies to SSB).
You know he is in there, but despite struggling with the narrowest possible bandwidth and
every trick your receiver is capable of, you just can't get his call as he floats in and
out of the noise.
I maintain that even ONE dB matters in this situation.
On 9/27/2013 10:03 AM, Ron D'Eau Claire wrote:
Quite true on HF.
3dB often matters doing weak signal work on 6 meters and up, and sometimes
on 10 meters, but on HF there are too many other variables, QSB, etc.
Back in the 30's and 40's the "Radio Engineering" texts used to list 6 dB as
the minimum change one might expect to detect by ear on HF due to all the
propagation variations. (Back then, 10 meters was a UHF band.)
I always thought that was why Collins settled on 6dB for one S-unit on their
receiver S-meters.
73, Ron AC7AC
-----Original Message-----
I think there is a lot of evidence that 3dB does not matter. 10dB matters.
6dB might matter.
wunder
Walter Underwood
K6WRU
CM87wj
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Vic, K2VCO
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