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Re: [Discuss-gnuradio] Re: A low-budget SDR - Was: PCIe know-how?

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Re: A low-budget SDR - Was: PCIe know-how?
Date: Tue, 6 Mar 2007 13:33:53 -0800
User-agent: Mutt/1.5.9i

On Tue, Mar 06, 2007 at 10:46:49PM +0200, address@hidden wrote:
> And indeed I've thought about saturating the ADC. I first thought
> about a varistor for the sole  purpose of protecting it from voltage
> spikes, but I realized that it could cause clipping, which would look
> like overmodulation and could drown signals in noise.
> One of the High Speed Data Transfers videos behind the link I posted
> in the blog mentions a circuit I could use to condition the input
> before it reaches the ADC, and it also mentions a balun very, very
> briefly. I think of all of this as the RF frontend, and a problem I
> don't need to solve yet. The RF frontend should be designed to allow
> for undersampling too, so it's far from straight-forward. I think I'll
> be designing it or looking for existing designs as the last thing,
> because it is so important.
> -- 
> Nos

FYI, there's a discussion on front-end protection taking place right
now on the hpsdr list.  Lots of clueful discussion, including parts
selection, etc.

Here's the head of the thread:


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