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Re: LF: First MF TA since a longer time

from [Andy Talbot] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: First MF TA since a longer time
From: Andy Talbot <[email protected]>
Date: Fri, 25 Sep 2015 10:13:51 +0100
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-6dB in 2.5kHz is very audible

This utility I wrote a while ago generates CW / audio tones in specified bandwidth to listen to, and allows you to put custom filters around the signal.   http://www.g4jnt.com/SNDemo.exe   (just ignore any security warnings and just run it, I promise it won't harm your machine )


You'll see that down to about -14dB S/n (2.5kHz) is just about detectable as an audio tone - although I doubt many even experienced OPs  could read CW that low

Andy  G4JNT


On 25 September 2015 at 10:00, Fausto Coletti <[email protected]> wrote:
Hi Stefan,
 
a wspr -6dB sgnal is audible ?
The question is this: with this condition and if necessary a bit more power it is possible a cw qso?
 
73, Fausto IK4NMF
 
 
----- Original Message -----
From: DK7FC
Sent: Friday, September 25, 2015 10:41 AM
Subject: Re: LF: First MF TA since a longer time

Hi all,

Last night there were excellent condx on 630m on the TA path! G8HUH, F5WK and DK7FC managed to be decoded in above 5000 km in WSPR.

I've got exceptional good SNR reports!:

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
 2015-09-25 04:52   DK7FC   0.475683   -23   0   JN49ik   1   WG2XKA   FN33lq   5970   297 
 2015-09-25 04:32   DK7FC   0.475683   -16   0   JN49ik   1   WD2XSH/17   FN42pb   5927   294 
 2015-09-25 04:32   DK7FC   0.475684   -6   0   JN49ik   1   W1TAG/1   FN43sv   5789   296 
 2015-09-25 00:32   DK7FC   0.475683   -5   0   JN49ik   1   TF3HZ   HP94ad   2440   323 

-6 dB by W1TAG/1 means that many weaker stations could have made the path as well, in that time slot!

73, Stefan

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