[Linrad] Re: Linrad 03.05b and SDR-IQ

[attglobal.net; radio1@xxxxxxxxxxxxxxxx>]

When my waterfall was blank, I found a box in the lower right corner 
with "20 db" in it I changed this to -10 db and it looks like I had expected.
John K1VBM

---- Original Message ----

From: "Thomas D. Dean" <tomdean@xxxxxxxxxxxxx>
To: linrad@xxxxxxxxxxxxxxxx
Cc: 
Subject: [Linrad] Re: Linrad 03.05b and SDR-IQ
Date: Thu, April 09, 2009, 09:21:00


On Thu, 2009-04-09 at 12:21 +0200, Leif Asbrink wrote:

> of something like 20Hz to 24kHz it is easy. I do not think you can
> use the SDR-IQ at these low frequencies. The specification is
> 10kHz and upwards. You should just use a soundcard.

The SDR-IQ is stated as useable down to 100Hz.  I know about the low
freq rolloff.
> 
> > I want to view signals from the noise
> > floor to say -50db.


> -50 dB what? You must specify relative to something. 
> 

I think the signal level from NLK in my area is about -50dbm.
I am unsure of the measurement, this is the value from the SV calibrated 
screen.

> You will have to connect an analog signal source to the soundcard

I am not using a sound card, only the SDR-IQ.

> > I want to have the waterfall advance at some slow
> > rate that I do not know how to specify.
> You will easily find out once you have your soundcard running
> with an input signal. (There is an F1 help)

Is it possible to get a waterfall display with the SDR-IQ?

I have connected the SDR-IQ to my 12x12x36", 21 turn loop.  I can see
several VLF stations in the FFT (is spectrum right word?) display.  I
cannot see the waterfall display, it seems blank.







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