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Wideband IQ Daughterboard

EG
Eugene Grayver
Tue, Mar 21, 2023 10:11 PM

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?

Eugene.

Eugene Grayver, Ph.D.
Aerospace Corp., Principal Engineer
Tel: 310.336.1274

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? Eugene. ________________________ Eugene Grayver, Ph.D. Aerospace Corp., Principal Engineer Tel: 310.336.1274 ________________________
BP
Brian Padalino
Tue, Mar 21, 2023 10:18 PM

On Tue, Mar 21, 2023 at 6:12 PM Eugene Grayver eugene.grayver@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?

On Tue, Mar 21, 2023 at 6:12 PM Eugene Grayver <eugene.grayver@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
EG
Eugene Grayver
Tue, Mar 21, 2023 11:12 PM

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 bpadalino@gmail.com
Sent: Tuesday, March 21, 2023 3:18 PM
To: Eugene Grayver eugene.grayver@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.grayver@aero.orgmailto:eugene.grayver@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

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 <bpadalino@gmail.com> Sent: Tuesday, March 21, 2023 3:18 PM To: Eugene Grayver <eugene.grayver@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.grayver@aero.org<mailto:eugene.grayver@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
MD
Marcus D. Leech
Wed, Mar 22, 2023 12:32 AM

On 21/03/2023 18:11, Eugene Grayver 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?

Eugene.

I believe that it's an AD8318--which you can see in the schematics if
you zoom way in.  It looks like someone typoed on the
  part-number "back in the day", and it was "corrected" with the
insertion of a "3".

Anyway, I THINK the frequency response is set by the output resistor and
capacitor in that circuit.    The 8138 itself has
  good response out to about 100MHz--from the datasheets.   So I think
the roll-off is implemented with that series R-C on
  the output.

On 21/03/2023 18:11, Eugene Grayver 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? > > Eugene. > > I believe that it's an AD8318--which you can see in the schematics if you zoom way in.  It looks like someone typoed on the   part-number "back in the day", and it was "corrected" with the insertion of a "3". Anyway, I THINK the frequency response is set by the output resistor and capacitor in that circuit.    The 8138 itself has   good response out to about 100MHz--from the datasheets.   So I think the roll-off is implemented with that series R-C on   the output.
BP
Brian Padalino
Wed, Mar 22, 2023 1:56 PM

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.grayver@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 bpadalino@gmail.com
Sent: Tuesday, March 21, 2023 3:18 PM
To: Eugene Grayver eugene.grayver@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.grayver@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

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.grayver@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 <bpadalino@gmail.com> > *Sent:* Tuesday, March 21, 2023 3:18 PM > *To:* Eugene Grayver <eugene.grayver@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.grayver@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 >
RM
Robert McGwier
Mon, Mar 27, 2023 2:50 AM

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 bpadalino@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.grayver@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 bpadalino@gmail.com
Sent: Tuesday, March 21, 2023 3:18 PM
To: Eugene Grayver eugene.grayver@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.grayver@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

USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com

--
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, Skyscrapers

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 <bpadalino@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.grayver@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 <bpadalino@gmail.com> >> *Sent:* Tuesday, March 21, 2023 3:18 PM >> *To:* Eugene Grayver <eugene.grayver@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.grayver@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 >> > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com > -- 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, Skyscrapers
MD
Marcus D. Leech
Mon, Mar 27, 2023 2:55 AM

On 26/03/2023 22:50, Robert McGwier wrote:

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

You can (theoretically) stream 200Msps from an X310 over 10GiGe. Getting
a 'pooter that can sustain that rate for
  any length of time is.....challenging.

On Wed, Mar 22, 2023 at 9:58 AM Brian Padalino bpadalino@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.grayver@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 <bpadalino@gmail.com>
     *Sent:* Tuesday, March 21, 2023 3:18 PM
     *To:* Eugene Grayver <eugene.grayver@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.grayver@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

 _______________________________________________
 USRP-users mailing list -- usrp-users@lists.ettus.com
 To unsubscribe send an email to usrp-users-leave@lists.ettus.com

--
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

USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com

On 26/03/2023 22:50, Robert McGwier wrote: > 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 You can (theoretically) stream 200Msps from an X310 over 10GiGe. Getting a 'pooter that can sustain that rate for   any length of time is.....challenging. > > > On Wed, Mar 22, 2023 at 9:58 AM Brian Padalino <bpadalino@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.grayver@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 <bpadalino@gmail.com> > *Sent:* Tuesday, March 21, 2023 3:18 PM > *To:* Eugene Grayver <eugene.grayver@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.grayver@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 > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com > > -- > 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 > > _______________________________________________ > USRP-users mailing list --usrp-users@lists.ettus.com > To unsubscribe send an email tousrp-users-leave@lists.ettus.com
EG
Eugene Grayver
Mon, Mar 27, 2023 4:06 PM

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 rwmcgwier@gmail.com
Sent: Sunday, March 26, 2023 7:50 PM
To: Brian Padalino bpadalino@gmail.com
Cc: Eugene Grayver eugene.grayver@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 <bpadalino@gmail.commailto:bpadalino@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.grayver@aero.orgmailto:eugene.grayver@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 <bpadalino@gmail.commailto:bpadalino@gmail.com>
Sent: Tuesday, March 21, 2023 3:18 PM
To: Eugene Grayver <eugene.grayver@aero.orgmailto:eugene.grayver@aero.org>
Cc: usrp-users <usrp-users@lists.ettus.commailto:usrp-users@lists.ettus.com>
Subject: Re: [USRP-users] Wideband IQ Daughterboard

On Tue, Mar 21, 2023 at 6:12 PM Eugene Grayver <eugene.grayver@aero.orgmailto:eugene.grayver@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

USRP-users mailing list -- usrp-users@lists.ettus.commailto:usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.commailto:usrp-users-leave@lists.ettus.com

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.orghttp://explorescu.org, Skyscrapers

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 <rwmcgwier@gmail.com> Sent: Sunday, March 26, 2023 7:50 PM To: Brian Padalino <bpadalino@gmail.com> Cc: Eugene Grayver <eugene.grayver@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 <bpadalino@gmail.com<mailto:bpadalino@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.grayver@aero.org<mailto:eugene.grayver@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 <bpadalino@gmail.com<mailto:bpadalino@gmail.com>> Sent: Tuesday, March 21, 2023 3:18 PM To: Eugene Grayver <eugene.grayver@aero.org<mailto:eugene.grayver@aero.org>> Cc: usrp-users <usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>> Subject: Re: [USRP-users] Wideband IQ Daughterboard On Tue, Mar 21, 2023 at 6:12 PM Eugene Grayver <eugene.grayver@aero.org<mailto:eugene.grayver@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 _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> To unsubscribe send an email to usrp-users-leave@lists.ettus.com<mailto:usrp-users-leave@lists.ettus.com> -- 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
RK
Rob Kossler
Mon, Mar 27, 2023 8:39 PM

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

On Mon, Mar 27, 2023 at 12:08 PM Eugene Grayver eugene.grayver@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 rwmcgwier@gmail.com
Sent: Sunday, March 26, 2023 7:50 PM
To: Brian Padalino bpadalino@gmail.com
Cc: Eugene Grayver eugene.grayver@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 bpadalino@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.grayver@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 bpadalino@gmail.com
Sent: Tuesday, March 21, 2023 3:18 PM
To: Eugene Grayver eugene.grayver@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.grayver@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

USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com

--
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, Skyscrapers

USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-leave@lists.ettus.com

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 On Mon, Mar 27, 2023 at 12:08 PM Eugene Grayver <eugene.grayver@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 <rwmcgwier@gmail.com> > *Sent:* Sunday, March 26, 2023 7:50 PM > *To:* Brian Padalino <bpadalino@gmail.com> > *Cc:* Eugene Grayver <eugene.grayver@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 <bpadalino@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.grayver@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 <bpadalino@gmail.com> > *Sent:* Tuesday, March 21, 2023 3:18 PM > *To:* Eugene Grayver <eugene.grayver@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.grayver@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 > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com > > -- > 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, Skyscrapers > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com >
MD
Marcus D. Leech
Mon, Mar 27, 2023 10:10 PM

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.grayver@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 <rwmcgwier@gmail.com>
 *Sent:* Sunday, March 26, 2023 7:50 PM
 *To:* Brian Padalino <bpadalino@gmail.com>
 *Cc:* Eugene Grayver <eugene.grayver@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
 <bpadalino@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.grayver@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 <bpadalino@gmail.com>
         *Sent:* Tuesday, March 21, 2023 3:18 PM
         *To:* Eugene Grayver <eugene.grayver@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.grayver@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

     _______________________________________________
     USRP-users mailing list -- usrp-users@lists.ettus.com
     To unsubscribe send an email to usrp-users-leave@lists.ettus.com

 -- 
 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
 _______________________________________________
 USRP-users mailing list -- usrp-users@lists.ettus.com
 To unsubscribe send an email to usrp-users-leave@lists.ettus.com

USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-leave@lists.ettus.com

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.grayver@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 <rwmcgwier@gmail.com> > *Sent:* Sunday, March 26, 2023 7:50 PM > *To:* Brian Padalino <bpadalino@gmail.com> > *Cc:* Eugene Grayver <eugene.grayver@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 > <bpadalino@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.grayver@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 <bpadalino@gmail.com> > *Sent:* Tuesday, March 21, 2023 3:18 PM > *To:* Eugene Grayver <eugene.grayver@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.grayver@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 > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com > > -- > 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 > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-leave@lists.ettus.com > > > _______________________________________________ > USRP-users mailing list --usrp-users@lists.ettus.com > To unsubscribe send an email tousrp-users-leave@lists.ettus.com
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