LF: about guns, water pistols and dripping tabs

[Rik Strobbe <rik.strobbe@fys.kuleuven.be>]

Eddie, Andy, Roger, all,

the nice thing about WSPR and the
www.wspr.org web site
is that a lot af data is available.
I copied the my spots (past 7 days) of G4JNT, G3XBM and G3ZJO from the
web site and threw them in the mill to check how often I copied  at
least 2 of the 3 calls in the same time slot:
I took only the night time spots as I assume that propagation then is 1
hop ionospheric and small differences in distance are less
important.

* G3XBM - G3ZJO: 6 'hits', average difference = 8dB (in favor of
Roger)
6 data sets is a bit low to to proper statistics, but the difference of
8dB between Roger and Eddie fits well into the claimed ERP's (1mW and
200uW = 7dB)

* G4JNT - G3XBM : 60 'hits', average difference = 15dB (in favor of
Andy)
15dB difference would mean that if Roger's 1mW ERP is correct that Andy
would run "only" 30mW ERP ?
But the standard dev. is 6dB, so it could be (a more realistic) 120mW as
well ...

* G4JNT - G3ZJO: 6 'hits', average difference = 23dB (in favor of
Andy)
Nice, this is the sum of the previous values (as iit should be ;-)
)

All values are give or take some dB, but they seem to make
sense.

73, Rik  ON7YD - OR7T

At 23:14 20/01/2010, you wrote:

Yeh ! Congratulations Roger.
 
Lubos you have the Water Pistol, can you now RX a tiny Dripping Tap, my QRPp 200uW ERP is on..
 
73
 
Eddie G3ZJO
 
-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [ mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Andy Talbot
Sent: 20 January 2010 22:01
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: G3XBM
 
Congratulations,  "water pistol"
1200km - a very comfortable margin too.
 

Andy
www.g4jnt.com

2010/1/20 Lubos OK2BVG <bvgbob@hotmail.com>
Hello Roger, LF!
This moment is just now:

2136  -7  0.2   0.503874  0 G4JNT IO90 23

2142 -29 -0.5   0.503910  1 G3XBM JO02 0

Congratulation!

Lubos, OK2BVG, JN88KS

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