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Re: [Discuss-gnuradio] differences between usrps

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] differences between usrps
Date: Tue, 06 Sep 2011 18:07:48 -0400
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On 09/06/2011 08:27 AM, Walter Barmak wrote:

as some of you already know, i have a usrp1 with 2 rfx1800 burned to
rfx900, two small antenas (13db, 60 watts) and a stock clock of 64mhz
which i'm planning to change for the external clocktamer. however,
before i do that, i'd like to know which is the best option for me.

1) as i understand, the main difference between usrp1 and usrp n210 is
the frequency range. does this have to do with the capacity for
concurrent calls? is this why the usrp1 can have 7 concurrent calls
while the usrp n210 can have up to 12 concurrent calls (without further
Not frequency range. The USRP1 and USRP2/N210 family will operate over identical frequency ranges for the same daughtercards. But the *instantaneous bandwidth* towards the host is higher with the N210 (25Msps vs 8Msps), so depending on the channel allocation scheme of
  whatever your application is, this can allow more channels.

2) also, i'd like to know what would be the reach of my system in open
field. i guess, as i now have it, would be around 200 meters, so if i
would like to improve that i would need either a filter (for transmit
and receive?) or a duplexer and a higher power antena?
You'd need a power amplifier and duplexor arrangement, likely. But that would take an operation that is already on the edge of legality, and make it utterly illegal in most places, since you'd be interfering with licensed services (the GSM operators).

3) what is the ethernet connection in the usrp n210 for?
The ethernet connection is how samples go into/out-of the N210. On the USRP1, those samples
  are carried over USB.

4) if i would like to increase the number of concurrent calls, i guess i
would need to buy more usrps, which ones would be better to achieve a
higher number of concurrent calls? ie, which is designed to be able to
connect to other usrps and increase the number of concurrent calls?

thanks in advance,

That's a question for the OpenBTS list. OpenBTS is one of *hundreds* of different applications extant for Gnu Radio and the USRP family of digital transceivers. Direct OpenBTS questions to the appropriate list.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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