There is no need to wonder how good your (or anyone's) receive syatem 
is. By using the databases for Opera and/or WSPR
(http://wsprnet.org/drupal/wsprnet/spots)
simply compare the reports you are giving a particular station with 
the reports from others who are a similar distance away from that 
station. You can also average the comparitive reports on Opera and 
WSPR to get an idea of how accurate your frequency setting is.  

In your case, Martin, you appear to be receiving DCF39 well, but I 
expect it would work even better with a tuned antenna. My own system 
shows over 60dB between DCF39 and noise in an SSB bandwidth during 
the daytime, but of course I have less land between me (in 
Hertfordshire) and Germany. I have just looked at the database and 
cannot see your reports so I presume you are not uploading any.

Mike, G3XDV
==========

> 
> Watching Roger's adventures on 136kHz, I thought I'd go  take a look
> and I wondered -
> 
> DCF39 is about 50dB above the noise at 16:44UTC.
> 
> I'm using a 150ft inverted L, untuned, stuffed directly into an Elad
> FDM-S2 SDR.
> 
> Decoded G3XIZ, G4FTC, G8HUH & G4GIR between 16:12 and 16:44.
> 
> What does this say about my setup?
> 
> Is it deaf/average/ok?
> 
> How far above the noise is DCF39 in an optimised "good" setup?
> 
> Anyone tell me?
> 
> Martin GW3UCJ Swansea.
>