[hpsdr] ADC overload problems.

[Kjell Karlsen]

Hi Lars.

Thank you for the tip!

I called a friend of mine working at EISCAT and he confirmed the signals  
are coming from them. But when I explained what I have observed, he meant  
there must be something wrong with the transmitters. They have got some  
new equipment and they are doing some tests with it so I really hope they  
are not going to continue with this type of "modulation".

As far as he knew, they usually transmits CW, ON and OFF for every 2-5  
seconds so this should not give any broadband spectrum. But 12  
transmitters, 100 KW each combined to >1 MW will for sure drive my ADC to  
overload. There is a mountain between the TX and Tromso and the distance  
is 15 Km so normally the ground wave is attenuated a lot but the reflected  
sky wave is very strong at times.

As I said in my first e-mail, we have not had this type of problems from  
EISCAT before so I really hope it is a fault!

73, Kjell





På Wed, 17 Oct 2012 15:12:14 +0200, skrev Lars E. Pettersson  
<lars at homer.se>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Kjell,
>
> On 10/16/2012 07:47 PM, Kjell Karlsen wrote:
>> Spectrum Analyzer and located the signal to 4,545 MHz the first time and
> ...
>> but no code sent as far as I heard.  Today a signal is on at 4,040 but
> ...
>> We are going to see if we can locate this transmitters. I am quite sure
>> it has not been active before.
>
> It's your neighbour, the EISCAT's ionospheric Heating facility in  
> Tromsø, http://www.eiscat.se/about/info/heating/
>
> 73 de Lars, sm6rpz


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