29 May
2011
29 May
'11
6:16 p.m.
Hi!
For those interested, I've taken apart the case and did some
investigation how the FCDP hardware architecture looks like.
The results are available at
http://tetra.osmocom.org/trac/wiki/Funcube_Dongle
It seems the silicon tuner actually is intended for DVB-T, thus the
bandwidth it can down-convert is _much_ higher. However, the audio
codec that they use can only do 96kHz.
That's actually really sad. I wish they had used something with higher
ADC rate. But it seems like even high-end audio codecs never get you
beyond 196/216 kHz - still insufficient for e.g. GSM.
Regards,
Harald
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
1 Jun
1 Jun
11:19 a.m.
Hi!
2011/5/29 Harald Welte <laforge(a)gnumonks.org>rg>:
Hi!
For those interested, I've taken apart the case and did some
investigation how the FCDP hardware architecture looks like.
The results are available at
http://tetra.osmocom.org/trac/wiki/Funcube_Dongle
That's quite interesting as the E4000 seems to handle all the analog
stuff without external LNA, etc.
Simplifies things a lot.
It seems the silicon tuner actually is intended for
DVB-T, thus the
bandwidth it can down-convert is _much_ higher. However, the audio
codec that they use can only do 96kHz.
That's actually really sad. I wish they had used something with higher
ADC rate. But it seems like even high-end audio codecs never get you
beyond 196/216 kHz - still insufficient for e.g. GSM.
I wasn't able to find the output bandwidth of the E4000 somewhere on
the website. Do you have an idea of the bw?
Still, gluing a faster dual-ADC plus hi-speed USB IF to the tuner
shouldn't be that much of a problem.
It seems though, the E4000 can only be obtained from Elonics. No luck
with digikey, R+S, farnell...
Maybe we should try to ask Elonics if they'd be willing to provide
some samples+datasheet and the DVB-T reference design.
If we somehow could put an open design together, I guess we could find
someone to build+sell larger quantities.
I really would be interested in such a dongle w/ faster ADCs.
What do you think?
Regards,
Benedikt / hunz
2:56 p.m.
Hi,
I am in the process of building a
small unit with the E4000 connected to our mini-USRP design. We
expecting the receiver board to be ready by the end of August.
The device is under NDA, you need to sign and NDA with the company in order to get their
datasheet. And once they have approved your company they
will send you the datasheet as well as the name of their local
distributer.
The device has an internal programmable IF RC Filter between 1MHz and 21.4 MHz in 16
steps.
BR,/Farhad
________________________________
From: Benedikt Heinz <zn000h(a)gmail.com>
To: Harald Welte <laforge(a)gnumonks.org>
Cc: tetra(a)lists.osmocom.org
Sent: Wednesday, June 1, 2011 11:19 AM
Subject: Re: Fun Cube Dongle Pro internals
Hi!
2011/5/29 Harald Welte <laforge(a)gnumonks.org>rg>:
Hi!
For those interested, I've taken apart the case and did some
investigation how the FCDP hardware architecture looks like.
The results are available at
http://tetra.osmocom.org/trac/wiki/Funcube_Dongle
That's quite interesting as the E4000 seems to handle all the analog
stuff without external LNA, etc.
Simplifies things a lot.
It seems the silicon tuner actually is intended
for DVB-T, thus the
bandwidth it can down-convert is _much_ higher. However, the audio
codec that they use can only do 96kHz.
That's actually really sad. I wish they had used something with higher
ADC rate. But it seems like even high-end audio codecs never get you
beyond 196/216 kHz - still insufficient for e.g. GSM.
I wasn't able to find the output bandwidth of the E4000 somewhere on
the website. Do you have an idea of the bw?
Still, gluing a faster dual-ADC plus hi-speed USB IF to the tuner
shouldn't be that much of a problem.
It seems though, the E4000 can only be obtained from Elonics. No luck
with digikey, R+S, farnell...
Maybe we should try to ask Elonics if they'd be willing to provide
some samples+datasheet and the DVB-T reference design.
If we somehow could put an open design together, I guess we could find
someone to build+sell larger quantities.
I really would be interested in such a dongle w/ faster ADCs.
What do you think?
Regards,
Benedikt / hunz
2 Jun
2 Jun
4:57 p.m.
Hi Hunz,
On Wed, Jun 01, 2011 at 11:19:52AM +0200, Benedikt Heinz wrote:
yes, one of those highly integrated silicon tuners. Lots of voodoo, no
documentation. welcome to the brave new world :(
The results
are available at
http://tetra.osmocom.org/trac/wiki/Funcube_Dongle
That's quite interesting as the E4000 seems to handle all the analog
stuff without external LNA, etc. Simplifies things a lot. I wasn't able to find the output bandwidth of the
E4000 somewhere on
the website. Do you have an idea of the bw?
i think this was answered before. in the QT gui application you can
select something like up to 21 MHz. And as it is intended as a DVB
tuner, I would expect usual DVB bandwidths.
I really would be interested in such a dongle w/
faster ADCs.
What do you think?
As indicated on IRC/jabber, some of the 'usual suspects' are already
looking into this. it's too early to commit to anything, though.
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
4712
days inactive
4716
days old
3 comments
3 participants
participants (3)
-
Benedikt Heinz -
Farhad Abdolian -
Harald Welte