Hi Rik

 

Thanks for looking up that information and sharing it. It is so good when the figures work out logically. I have been careful not to make excessive claims of my ERP as has Roger. I try to take account of any slight improvements I make. A good thing because any silly claims would have been blown out of the water by the actual figures.

 

There is one more comparison, that of my ERP against G4JNT. Andy averages 23dB more than me; his ERP is stated as 0.2W, 30dB more than mine. This discrepancy is in the same direction as the JNT – XBM example, we need that 6dB standard dev again.

 

Interestingly the RF at 50ohm difference G4JNT 100Watts, G3ZJO 1Watt is 20dB. I would fully expect my antenna to be 10dB worse than Andy’s.

 

Most interesting.

 

73    

 

 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Rik Strobbe
Sent: 21 January 2010 10:43
To: [email protected]
Subject: LF: about guns, water pistols and dripping tabs

 

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: [email protected] [ mailto:[email protected]] On Behalf Of Andy Talbot
Sent: 20 January 2010 22:01
To: [email protected]
Subject: Re: LF: G3XBM
 
Congratulations,  "water pistol"
1200km - a very comfortable margin too.
 

Andy
www.g4jnt.com

2010/1/20 Lubos OK2BVG <[email protected]>
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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