On 27/03/2023 16:39, Rob Kossler via USRP-users wrote:
Hi Eugene,
I don't know why the basic Rx has a lower frequency listed. It seems
inconsistent with other notes such as the following found here
<https://kb.ettus.com/Selecting_a_RF_Daughterboard>
Some USRP radio users elect to use an external front end providing
upconversion, downconversion, amplification and filtering
functionality. In these cases, the frontend often outputs an
intermediate frequency (IF). It is also possible for the frontend
to provide an analog, quadrature interface. In either case the
BasicRX/BasicTX and LFRX/LFTX daughterboards are good candidates,
as they provide a unity gain interface to the ADC(s) and DAC(s) of
the USRP hardware.
I have not tried so I can't confirm if it will work. I can only say
that it was my understanding that the Basic Rx could be used for your
specific application.
Rob
The datasheet for the input balun transformer:
https://www.minicircuits.com/pdfs/ADT1-1WT.pdf
Would seem to indicate that the quoted "1MHz" bottom-end was a *bit*
conservative but not horrifically so. I'd guess that at
100kHz the insertion loss might be as much as 2dB.
The series coupling on the balanced side of the transformer probably has
some loss below the stated 1MHz as well.
On Mon, Mar 27, 2023 at 12:08 PM Eugene Grayver
<eugene.gray...@aero.org> wrote:
Yes, as evidenced by UBX-160. X310 can stream 200 Msps complex,
which is sufficient for 160 MHz of BW.
________________________
Eugene Grayver, Ph.D.
Aerospace Corp., Principal Engineer
Tel: 310.336.1274
________________________
------------------------------------------------------------------------
*From:* Robert McGwier <rwmcgw...@gmail.com>
*Sent:* Sunday, March 26, 2023 7:50 PM
*To:* Brian Padalino <bpadal...@gmail.com>
*Cc:* Eugene Grayver <eugene.gray...@aero.org>; usrp-users
<usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] Re: Wideband IQ Daughterboard
Can the existing firmware support that bandwidth? The 10Gbps
Ethernet can but I am not sure about the rest of the USRP. I own
two of them and have never tried to do that.
Bob
On Wed, Mar 22, 2023 at 9:58 AM Brian Padalino
<bpadal...@gmail.com> wrote:
You're right - I completely missed that part of the email.
My apologies.
Brian
On Tue, Mar 21, 2023 at 7:12 PM Eugene Grayver
<eugene.gray...@aero.org> wrote:
Yes, as stated in the original post 'Basic-RX with a
minimum of 1 MHz'. The DC is cutoff by the balun on the
basicRX making it unsuitable for IQ.
________________________
Eugene Grayver, Ph.D.
Aerospace Corp., Principal Engineer
Tel: 310.336.1274
________________________
------------------------------------------------------------------------
*From:* Brian Padalino <bpadal...@gmail.com>
*Sent:* Tuesday, March 21, 2023 3:18 PM
*To:* Eugene Grayver <eugene.gray...@aero.org>
*Cc:* usrp-users <usrp-users@lists.ettus.com>
*Subject:* Re: [USRP-users] Wideband IQ Daughterboard
On Tue, Mar 21, 2023 at 6:12 PM Eugene Grayver
<eugene.gray...@aero.org> wrote:
Hello,
I want to use an external IQ mixer with an external
LO. My signal is 160 MHz wide, which fits nicely into
the nominal complex 200 MHz Nyquist of the X310.
Unfortunately the only daughterboards for direct
access to the ADCs are LFRX which maxes out at 30 MHz,
and the Basic-RX with a minimum of 1 MHZ.
I am thinking of spinning a custom daughter board
derived from LFRX with a wideband differential driver
such as
https://www.analog.com/media/en/technical-documentation/data-sheets/6406fc.pdf
or
alternatively just replacing the chip on an LFRX since
these appear to be footprint compatible.
Separately, I was looking at LFTX schematics and the
part # for the amplifier is not specified. Can
somebody at Ettus/NI save me some time and lookup that
part #.
Comments?
Have you considered the BasicRX?
https://www.ettus.com/all-products/basicrx/
https://files.ettus.com/schematics/basic_dbs/BasicRX.pdf
Brian
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--
Dr. Robert W McGwier, Ph.D.
Affiliated Faculty, Virginia Tech
Affiliated Faculty, University of Scranton
Former ARDC Member of Board
N4HY: ARRL, TAPR, AMSAT, EARC, CSVHFS
Sky: AAVSO, Sky360, explorescu.org <http://explorescu.org>,
Skyscrapers
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