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Date: Tue, 09 Sep 2008 18:55:37 +0200
From: =?ISO-8859-1?Q?Wolfgang_B=FCscher?= <dl4yhf@freenet.de>
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Subject: Re: LF: AOR 7030 replaced
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Hi Laurie and the group,

Fortunately, there are alternatives to these new shiny 
TFT-colour-display-equipped "top class" radios:
For weak signal modes, use software defined radios like SDR-IQ, Perseus, 
etc to name just a few.
They are basically digital downconverters with internal high-performance 
A/D converter, and interface to the USB port directly (no soundcard 
required).
RF and IF gain are selectable (via control software) but not automatic, 
so ideally suited for weak signal modes.

I think Brian CT1DRP uses the SDR-IQ with the original software, but 
other weak-signal processing software like Alberto's Winrad, or DL4YHF's 
Spectrum Lab, support these radio too.

Best regards,
  Wolf .


lawrence mayhead schrieb:
> This could be a backward step for those of us using Argo/ Spectran etc 
> to look for
> weak signals. All DSP receivers including the Icom 756 Pro 111 are not 
> able to turn
> off the AGC. Hence when looking in a small bandwith usually much 
> smaller than the
> DSP or even conventional filter bandwiths a strong signal within this 
> larger b/w will
> de-sensitise the receiver to the extent that the weak signal will be 
> lost. This was the
> problem I had in the early days of TA working.
> 73 Laurie.