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EG

Eugene Grayver

Fri, Aug 8, 2025 6:49 PM

Hi,

I have a bunch of N320/N321s. All but one are working OK. One has an output power that's ~20 dB lower than expected. Testing with tx_waveforms --gain 60 generates a tone at around 1 dBm, instead of the expected ~20 dBm. The USRPs get rather warm — could this be a heat-related failure? But if so, why just one?

Any ideas?

Thanks.

Eugene Grayver, Ph.D.
Principal Engineer
310-336-1274

Hi, I have a bunch of N320/N321s. All but one are working OK. One has an output power that's ~20 dB lower than expected. Testing with tx_waveforms --gain 60 generates a tone at around 1 dBm, instead of the expected ~20 dBm. The USRPs get rather warm — could this be a heat-related failure? But if so, why just one? Any ideas? Thanks. Eugene Grayver, Ph.D. Principal Engineer 310-336-1274

NB

Nikos Balkanas

Fri, Aug 8, 2025 8:09 PM

Hi Eugene,

I assume your usrps are connected to the same host and UHD. This seems to
be a usrp hardware issue.
I would talk to NI to send my unit back:(

On Fri, Aug 8, 2025 at 9:49 PM Eugene Grayver eugene.grayver@aero.org
wrote:

Hi,

I have a bunch of N320/N321s. All but one are working OK. One has an
output power that's ~20 dB lower than expected. Testing with tx_waveforms
--gain 60 generates a tone at around 1 dBm, instead of the expected ~20
dBm. The USRPs get rather warm — could this be a heat-related failure?
But if so, why just one?

Any ideas?

Thanks.

Eugene Grayver, Ph.D.
Principal Engineer
310-336-1274

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

Hi Eugene, I assume your usrps are connected to the same host and UHD. This seems to be a usrp hardware issue. I would talk to NI to send my unit back:( On Fri, Aug 8, 2025 at 9:49 PM Eugene Grayver <eugene.grayver@aero.org> wrote: > Hi, > > I have a bunch of N320/N321s. All but one are working OK. One has an > output power that's ~20 dB lower than expected. Testing with tx_waveforms > --gain 60 generates a tone at around 1 dBm, instead of the expected ~20 > dBm. The USRPs get rather warm — could this be a heat-related failure? > But if so, why just one? > > Any ideas? > > Thanks. > > Eugene Grayver, Ph.D. > Principal Engineer > 310-336-1274 > _______________________________________________ > 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

Fri, Aug 8, 2025 10:08 PM

On 2025-08-08 16:09, Nikos Balkanas wrote:

Hi Eugene,

I assume your usrps are connected to the same host and UHD. This seems
to be a usrp hardware issue.
I would talk to NI to send my unit back:(

I agree. This seems like a hardware issue--perhaps a failing RF PA section.

Please contact NI/Emerson support for repair advice.

On Fri, Aug 8, 2025 at 9:49 PM Eugene Grayver
eugene.grayver@aero.org wrote:

 Hi,

 I have a bunch of N320/N321s.  All but one are working OK.  One
 has an output power that's ~20 dB lower than expected.  Testing
 with tx_waveforms --gain 60 generates a tone at around 1 dBm,
 instead of the expected ~20 dBm.  The USRPs get rather warm —
 could this be a heat-related failure?  But if so, why just one?

 Any ideas?

 Thanks.

 Eugene Grayver, Ph.D.
 Principal Engineer
 310-336-1274
 _______________________________________________
 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 2025-08-08 16:09, Nikos Balkanas wrote: > Hi Eugene, > > I assume your usrps are connected to the same host and UHD. This seems > to be a usrp hardware issue. > I would talk to NI to send my unit back:( I agree. This seems like a hardware issue--perhaps a failing RF PA section. Please contact NI/Emerson support for repair advice. > > On Fri, Aug 8, 2025 at 9:49 PM Eugene Grayver > <eugene.grayver@aero.org> wrote: > > Hi, > > I have a bunch of N320/N321s. All but one are working OK. One > has an output power that's ~20 dB lower than expected. Testing > with tx_waveforms --gain 60 generates a tone at around 1 dBm, > instead of the expected ~20 dBm. The USRPs get rather warm — > could this be a heat-related failure? But if so, why just one? > > Any ideas? > > Thanks. > > Eugene Grayver, Ph.D. > Principal Engineer > 310-336-1274 > _______________________________________________ > 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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N321 output power too low