I also have a trio on order. The issues I can see surrounding this approach
are:
o Consumer electronics parts lineups are capricious and unreliable--the
target device may use the "SDR-capable chip" this month, and next month,
they've found that they can shave $0.35 of off the B.O.M. by going with a
totally different parts line-up they will, even though it will cost them
$50K in engineering costs up front--they sell thousands and thousands a
month. There are already *TWO* versions of this dongle, one using the
"good" RTL2832U chip, and the other using an Afatech chip (AF9015 or
AF9035). The "magic sauce" that Antti discovered in the RTL2832U chip to do
"raw samples" is peculiar to the RTL2832U chip, and doesn't necessarily map
on to other DVB-T digital demod chips on the market.
o The 28.8MHz master oscillator is a very cheap 100PPM part, which will
produce unpleasant frequency offsets, and phase-noise to match
o Not sure how good the noise figure is, since there's no LNA in front of
the E4000 tuner chip.
o Don't know how they implement re-sampling. If it's not done right, then
there'll be nasty aliases in the passband handed to the host
None of these are fatal, but be aware that the approach of "re-purposing"
consumer electronics is fraught with dangers as described above.
-Marcus
On Thu, 22 Mar 2012 10:53:13 -0400, Tom Rondeau wrote:
Andrew and Sean,
Glad to hear you both thinking about doing this! Coordinate as you can
and keep us up to date on the progress.
Tom
On Thu, Mar 22, 2012 at 10:45 AM, Nowlan, Sean
<address@hidden> wrote:
Funny enough, a coworker mentioned it to me yesterday morning and then it
popped up on discuss-gnuradio. He must have seen it on Reddit as well.
I have one on order too, and I was also contemplating a GNUradio driver...
let me know if you want to coordinate.
Sean
-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of Andrew Davis
Sent: Wednesday, March 21, 2012 9:34 PM
To: David Kierzkowski; address@hidden
Subject: Re: [Discuss-gnuradio] This is nice
Saw it on Reddit a couple days ago, already have one on order. Then I might
work on making a GnuRadio driver or something for real-time use.
On Wed, Mar 21, 2012 at 3:17 AM, David Kierzkowski<address@hidden>
wrote:
The osmocom guys are using a 20$ USB catv tuner as a RF source in gnuradio.
3.2MS/s !
http://sdr.osmocom.org/trac/wiki/rtl-sdr
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