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List:       gnuradio-discuss
Subject:    [Discuss-gnuradio] Fw: Read about the GNU RFfrontend on the project
From:       "cfk" <cfk () pacbell ! net>
Date:       2004-04-06 2:13:30
Message-ID: 02b501c41b7c$c1ba8e60$640a0a0a () yang
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----- Original Message -----
From: "cfk" <cfk@pacbell.net>
To: "David Beberman" <dbeberman@corporatewavenet.com>
Cc: <dicsuss-gnuradio@gnu.org>
Sent: Monday, April 05, 2004 7:10 PM
Subject: Re: Read about the GNU RFfrontend on the project website.


> Dear David:
>     I did lay out and have six of the 4702 frontend boards made. One of
them
> is with Eric Blossom and he is checking it out with the USRP right now.
Once
> I know the layout and schematic are proven, then Eric & Matt will decide
how
> they want to produce them.
>
>     The vagc line is essentially a control of the sensitivity of the
tuner.
> It can be made more or less sensitive by changing the analog voltage on
that
> line.
>
>     Erir and Matt are mostly getting the USRP rev1 boards functional. The
> tuner is a small adjunct to their main effort.
>
>     I am certain that the USRP and the frontend4702 should receive OFDM
just
> fine. In fact, that is one of my reasons for laying it out in the first
> place. I want to study ATSC modulation a bit, amongst other things.
>
>     At this point, I would urge you to understand the software created by
> Eric and Matt. Just get on the newsgroup and jump in.
>
>     Charles
>
>
> ----- Original Message ----- From: "David Beberman"
> <dbeberman@corporatewavenet.com>
> To: <cfk@pacbell.net>
> Sent: Monday, April 05, 2004 11:20 AM
> Subject: Read about the GNU RFfrontend on the project website.
>
>
> > Hi Charles,
> >
> > I am just starting to learn about the GNU Software Radio project.
> > From the website, you wrote that you are working on a daughter card for
> the
> > USRP.  Are you planning to produce this?
> > I am trying to figure out if I can create an implementation of an OFDM
> > algorithm I have been working on, using a software radio.
> >
> > My analog knowledge is pretty much gone at this point, so I can't
> > really make much of your schematic.  I did notice that there was a
> > line labelled vagc.  Any chance that this is a receive signal strength
> > indication?
> >
> > I'm looking to do packet burst transmission and reception.  I need
> > to be able to do energy detection to find the start of the packet and
> > training symbols.  I'd like to also be able to control the transmit
> > power with at least some level of granularity.  Just some thoughts
> > if your board isn't already capable of this.
> >
> > Any help or pointers in the right direction, would be appreciated.
> >
> > Thanks,
> >
> > David Beberman
> >
>




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