Hi Dan,
The E310/E312 has the switchable set of receive and transmit filters which
the B2xx does not. This will impact the noise figure due to the additional
losses of the switches and filters. As with most receivers an external LNA
and filter matched to a frequency of interest will reduce the tot
Yep, I am aware of that document and I am using the Y-factor method.
The 3 dB attenuator was calibrated with the B200 - i.e. I measured the NF
of the USRP + 3dB attenuator as a system. That data then serves as the
calibration data to correct for it's contribution to the subsequent NF
measurement o
A 3dB attenuation will really improve the reflection coefficient.
Using this calculator
http://www.rfcafe.com/references/calculators/vswr-return-loss-conversion-calculator.htm
you can see that a 3 dB attenuation will improve a 3:1 VSWR to 1.7:2,
or a 6 dB return loss to 12 dB, so you've really impr
I saw no improvement when including a 3dB 50 Ohm attenuator as part of the
B200 NF meter. I guess I could try higher attenuator values.
On Thu, Feb 1, 2018 at 9:16 PM Dan CaJacob wrote:
> I was gonna say, there's actually three of them ;)
>
> On Thu, Feb 1, 2018, 9:06 PM Robin Coxe via USRP-user
I was gonna say, there's actually three of them ;)
On Thu, Feb 1, 2018, 9:06 PM Robin Coxe via USRP-users <
usrp-users@lists.ettus.com> wrote:
> On p.8 of B200 schematic:
> T801 is Macom ETC1-1-13TR (RF2)
> T800 is Minicircuits TC1-1-43A+ (RF3)
> U802 is Anaren BD3150L50100AHF (RF1)
>
> On Thu, F
On p.8 of B200 schematic:
T801 is Macom ETC1-1-13TR (RF2)
T800 is Minicircuits TC1-1-43A+ (RF3)
U802 is Anaren BD3150L50100AHF (RF1)
On Thu, Feb 1, 2018 at 5:45 PM, Ron Economos via USRP-users <
usrp-users@lists.ettus.com> wrote:
> There's also a balun on the AD9361 input. Unfortunately, the balu
There's also a balun on the AD9361 input. Unfortunately, the balun part
number for the low frequency path is not on the schematic.
Ron
On 02/01/2018 05:39 PM, Dan CaJacob via USRP-users wrote:
That's an interesting thought. The 9361 does have a pretty bad match.
I'll try adding a 50 Ohm attenu
That's an interesting thought. The 9361 does have a pretty bad match. I'll
try adding a 50 Ohm attenuator and see if that helps.
On Thu, Feb 1, 2018 at 5:14 PM Robin Coxe wrote:
> Hi Dan. Both the B200 and the E312 use the Analog Devices AD9361 RF
> integrated transceiver. This chip does have
Hi Dan. Both the B200 and the E312 use the Analog Devices AD9361 RF
integrated transceiver. This chip does have an integrated LNA. Perhaps
there's some sort of mismatch between your DUTs and this integrated LNA at
<1 GHz?
ADI publishes the RX S-parameters:
https://ez.analog.com/thread/41208#13
Hey guys,
I have put together a noise figure meter application that uses a USRP as
the sensing device. It started off as a way to measure the NF of the USRP
itself. I have a calibrated noise source from an HP 8970B Noise Figure
Meter. To test the NF of the USRP, I connect the head to the USRP inpu
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