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

[David Bengtson]

You're going to need several stages of amplification to get to 5+
watts out. It can all be done on a single board, but making it work
requires a fair amount of experience. The other issue is the various
regulatory bodies are going to frown on something like that if you try
to sell it.

You can't really avoid multiple filters to keep harmonics and spurious
in check. Lot's of switched paths are the way to go.


Dave


On Sun, May 8, 2011 at 6:02 AM, Stefan Gofferje <address@hidden> wrote:
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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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