Re: LF: Re: Today...

["PA1SDB, Peter" <pa1sdb@amsat.org>]

Hello Stefan,

I did already re-build the LF RX situation here befor your mail came in.

I went back to 9 Khz already and was not able to do that noise measurement test.

 

I'm not sure why you are 'only' 20 dB S/N. In my opinion it was already very strong :-)

The Alinco DX70 is not that good at such low frequency's. Perhaps that is the reason ?

 

If I remember well, then I did modify it to get that low.

 

I will try that noise measurement test on 9 Khz as well.

But for now I have to go to bed.

I have to work at night (night shift) this week...

 

Btw, there was also a station on air who did send a K.

At about 19h35 UTC

 

 

 

73's and tnx you all for the input !

 

Peter, PA1SDB

 

 

 

 

----- Original Message -----

From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>

To: <rsgb_lf_group@blacksheep.org>

Sent: Monday, March 26, 2012 7:56 PM

Subject: Re: LF: Re: Today...

> PS: On your VLF 
spectrogram, it would be useful to enable the spectrum 
> as well. 
Normally you should see the Alphas at 20...30 dB S/N. But they 
> are 
covered by the very equal noise floor. Wow many dBs does the noise 
> 
floor drop when you disconnect the antenna from the soundcard, or 
> 
disconnect the power supply?
> 
> 73, Stefan
> 
> Am 
26.03.2012 20:33, schrieb PA1SDB, Peter:
>> Hello Stefan,
>> 
Loud and clear here in Appingedam, JO33kh
>> http://www.qsl.net/pa1sdb/
>>
>> I use that Mini Whip I was writing about a few 
times last week.
>>
>> 73's, Peter - 
PA1SDB
>>
>> Mini Whip @ 4 meters above the ground and Alinco 
DX70 rtx.
>>
>>
>