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Re: [Discuss-gnuradio] USRP custom hardware suppliers?

From: Stefan Gofferje
Subject: Re: [Discuss-gnuradio] USRP custom hardware suppliers?
Date: Sun, 08 May 2011 13:02:14 +0300
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On 05/07/2011 05:28 PM, David Bengtson wrote:
> That's a pretty aggressive goal, to hit 5W over the USRP BW. To get
> reasonable linearity, you're probably looking at something  that draws
> 25W of DC power. An external Amp is probably off the shelf. For
> example, Minicircuits has a TIA-1000 that does 4+ watts out from 100
> to 1000 MHz for $2000. You're probably going to need post PA filtering
> to eliminate harmonics and spurious as well.

Yeah, Marcus pointed me to the Minicircuits site. Pretty impressive
stuff. Here in Europe, you mainly get the usualy band-limited amps off
the shelf, like HF, 2m, 70cm, etc.
I'm pretty new to the whole SDR-stuff and not totally familiar with
everything yet. I had the chance to look into a commercial SDR some time
ago which was making 5W from 30 to 512MHz and at least I couldn't figure
out any amp module in there, so I assumed, the 5W came directly from the
SDR core - which Marcus told me is highly unlikely.
I'm still wondering about how to realize a system with a high bandwidth
(basically like the WBX but actually, we only need to go up to about
950MHz) without the need for several amps and/or filters while still
keeping the harmonics and spurious in check.
The main goal is ease of operation, i.e. the operator shouldn't need to
think about switching cables/hitting RF switches depending on the RF band.

- -- 
 (o_   Stefan Gofferje            | SCLT, MCP, CCSA
 //\   Reg'd Linux User #247167   | VCP #2263
 V_/_  Heckler & Koch - the original point and click interface
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