On 02/12/2024 11:53, Muhammad Anas wrote:
Daughtercard is WBX, so how much gain should I achieve in Spectrum
analyzer?
Actually, I just checked, and I was wrong about the +20dBm. According to
the datasheet:
https://kb.ettus.com/WBX#TX_Power_.28Max.29
The *gain control range* on the WBX goes from 0 to 31.5dB. So, if the
maximum output power at the antenna connector
looks like +20dBm, then at a gain setting of 0, you should expect
about -11.5dBm.
This assumes that your baseband signal magnitude is somewhere in the
{-1.0,+1.0} range, although it's generally
a good idea to not exceed {-0.85,+0.85} or so. Individual systems
will vary slightly.
You can use the "tx_waveforms" example to produce a very simple test:
Something like:
tx_waveforms --args "addr=192.168.10.2" --rate 1e6 --freq 50e6 --ampl
0.8 --gain 30 --wave-type SIN --wave-freq 10e3
Which will produce a CW tone 10kHz up from your tuned frequency of 50MHz.
I cannot provide guidance on how to set-up your spectrum analyzer.
On Mon, Dec 2, 2024, 9:30 PM Marcus D. Leech <patchvonbr...@gmail.com>
wrote:
On 02/12/2024 05:43, Muhammad Anas wrote:
Dear,
I'm using USRP N210 with GNU radio companion for transmission of
signal of 50M Hz and testing the signal on the R&S FSH20 Spectrum
analyzer using SMA cable, unfortunately I am not getting the
desired gain level of 20 dBm according to the datasheet of USRP,
in the spectrum analyzer. I'm getting -92 dBm at 0 level gain
from the usrp sink block in GNU radio and getting the only max
-68 dBm gain at 25 gain level from USRP sink block. After 25, to
even 100 level, I'm still getting the -68 dBm at the receiving
point. Here are my settings of FSH20:
Ref: -20 dBm
Att: 20 dB
RBW and VBW: 30k Hz
SWT: 1.29 s
Kindly, help me that if the problem is with the USRP or I will do
something to achieve the desired gain of 20 dBm, without using
any external amplifier. What are the reasons behind this problem
and how I can diagnose them.
Regards
Muhammad Anas
You haven't said which daughtercard you're using. I don't think
ANY of our radios will produce +20dBm, even at
MAX gain with high baseband magnitude.
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