Re: LF: http://rtlsdr.org/softwarewindows

[M0FMT <m0fmt@yahoo.co.uk>]

Hello group

 

Tell me more?

 

I have to say an up converter in front of a DVB-T TV stick works well at HF but at MF/LF owing to the necessity of spreading the band (owing to narrow allocation etc) the display presentation is not good. Very blocky I guess as a result of the slower processing but signals don't sound bad. Also the up converter in my case using an SBL-1 whilst fine at HF in terms of gain with no pre-amp at MF appears to need one. RX antenna gain at MF/LF is surely a factor and may be LO injection levels may not be at their optimum in my circuit.

 

I am very interested in the comment about added frequency coverage SANS up converter. Any detailed info would be most welcome?

 

73 es GL Pete M0FMT IO91UX

From: "victor13@online.nl" <victor13@online.nl>
To: rsgb_lf_group@blacksheep.org
Sent: Friday, 9 November 2012, 14:32
Subject: RE: LF: http://rtlsdr.org/softwarewindows

Hello Graham,

I use this rtlsdr with a lf converter with SBL1 to monitor the range from
4-140 khz,works very fine for such a cheap system!

73

Victor

-----Oorspronkelijk bericht-----
Van: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]Namens Graham
Verzonden: vrijdag 9 november 2012 13:49
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: http://rtlsdr.org/softwarewindows


Tnx Eberhard,

I think with post  dsp  processing the  dynamic range is  increased  in
narrow  window  ?  but  in 3  MHz will  be  42 ~  ?

There  is  a  version of the  software  that  enables  use to  be  made of
the  AD  directly  , needs  the  Rf  feed  to  be attached to  one of the
pins , not  the  main  input , with  then  no  need  for the  converter (not
tried yet as  my  original installation failed  will  need  to  remove  and
start again)

but for  £13 , not  a bad  system !

73 -G..

--------------------------------------------------
From: ""Eberhard v.Wedelstädt"" <dl3zid-1@mvnet.de>
Sent: Friday, November 09, 2012 10:08 AM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: http://rtlsdr.org/softwarewindows

> hi Graham
>
> any problems :  8-Bit  ADC  =>  bad dynamic range 48dB, real:
> (8-1)Bit => 42dB
>
> frequency-drift from the onboard-tuner  E4000  (50MHz up to 2.2GHz, a
> hole from  1.1GHz to 1.25GHz)
>
> frequency-drift from the konverter LO 67.899MHz
>
> but good usable as very simple spectrum-analysator.
>
> my neighbours plasma-TV:
>
> www.mvnet.de/priv/vw/ScreenShot002.jpg
>
> www.mvnet.de/priv/vw/ScreenShot004.jpg
>
>
>
>
> 73 Eberhard DL3ZID
>
>



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