Re: LF: WSPR 15 tonite

[John Lutz <n9jl@rocketmail.com>]

Edgar,

 

I looked at the grabber you linked to... amazing!  I can't imagine how a low power ~135 KHz signal could span a distance of 16K+ kilometers.  Very impressive.  I assume the propagation mode for this doesn't involve signal refraction off the F2 layer of the ionosphere.  Is that your understanding too?

 

You mentioned:

"... Also you need to pass the signal from the IDC-136II through software
like HDSDR before the WSPR software."

 

I would like to know more about this.  My intention was to take the ~6 KHz audio from the IDC-136II and route it directly into the sound card of my PC.  Sounds like that wouldn't necessarily be a good idea.  Am I correct in thinking that HDSDR or 'Spectrum Lab' is used to create some kind of audio bandpass filter (centered at ~6 KHz)?  If so, which program would you recommend?

 

Thanks for the guidance.

 

John / N9JL 

On Monday, October 21, 2013 2:08 AM, edgar <edgarjtwining@virginbroadband.com.au> wrote:

Hi John,

The reception is not WSPR but you may wish to look at this grabber,
which is using an IDC-136II receiver to monitor DCF39 and HGA22 and DK7FC.

https://dl.dropboxusercontent.com/u/101251787/testIDC.html

Also you need to pass the signal from the IDC-136II through software
like HDSDR before the WSPR software.

The normal WSPR 2200m dial frequency is 136 kHz, signal frequency is
137.4 to 137.6 kHz.

The the IDC-136II's oscillator is 130 kHz.

Regards, Edgar
Moonah, Tasmania.