[TowerTalk] Fw: Feeding single band HF yagis 500+ ft from the shack

[Jim Brown]

On 5/18/2022 10:33 AM, Lee Hiers wrote:
> K1DG has a presentation he's done for Contest University.  Per his study
> over time, he estimates that a 1dB improvement in your station results in a
> 6% score increase in a contest.

N6ZFO, who worked as a statistician in big pharma before retiring, did a 
statistical analysis of Sweepstakes scores comparing high power to low 
power (1,500 to 100W), and came up with a comparable number.

My own observations were from 160M contests, when I was S&P up and down 
the band without retuning my amp. The difference in power output varied 
by 1 - 1.5 dB. I would call stations I'd miss on a second pass, and 
failing to work them, retune to get back to full power and work them.

Yes, as Jim Lux says, could be prop, but this happened often enough for 
me to believe it was probably power.

Copyability of a signal is largely signal to noise ratio. In my 
professional life in pro audio, I did voice paging in office buildings 
in the presence of background noise (largely HVAC systems, but also 
office noises). When balancing those systems, a change of 1-2 dB often 
made the desired difference.

73, Jim K9YC