[TenTec] Eagle Tuner

[Carl Moreschi]

S units are a logarithmic scale and you don't use the ratio of S units 
for signal to noise.  If both the signal and the noise are reduced by 3 
S Units, which is 18 db, the actual signal to noise ratio stays exactly 
the same.

Beverages are often quieter because they don't hear equally in all 
directions.  If the noise happens to be in a different direction than 
the signal and the noise is in an unfavorable direction for the 
beverage, then the signal to noise is improved.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 9/9/2014 7:53 PM, Richards wrote:
>
> On 9/9/2014 4:51 PM, Carter wrote:
>> If the *noise* is "noticeable[y] quieter, 1 to 2 S units", wouldn't
>> the wanted *signal* also be down 1 to 2 S units?
>
> ___________________________________________________
>
>
> Hi Carter --
>
> I liked you question, and ponder... suggest... er... just thinking out
> loud...
>
> I wonder if the important or operative concept is "signal-to-noise"
> ratio. Consider Beverage antennas. They have much weaker signals, but
> also much lower noise factors, and make great receiving antennas. I
> suspect (i.e., guess) some thing similar is happening in Bob's case.
>
> A tentative theory: (i.e., wild guess) = If BOTH signal and noise are
> reduced, then the resulting signal seems stronger compared to the noise.
> Say, you have a signal level of of 8 S-units and a noise factor of 5
> S-units, then you have a ratio of 1.6; but lowering each by three
> S-units, assuming some sort of linearity between the two, you get a
> ratio of 2.5, so the signal level seems stronger relative to noise level.
>
> OK, Maybe it just seems that way. I am sure there is a mathematical or
> electrical fallacy lurking in the weeds, and I recall Jim Brown trying
> to explain a similar fallacy regarding the effects of the RF-GAIIN
> control... which I am still trying to wrap my head around... But I have
> not forgotten it... so, at least it SEEMS OR APPEARS to have a better
> signal to noise ratio, (remember the Beverage antenna seems to work this
> way) and that would be an advantage.
>
> OK... just a stab in the dark, the usual disclaimers apply.
>
> ------------------ K8JHR
> ------------------------------------------------------
>
>
>
>
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