Hi Rob,
I need complex signal. But I tried with a constant, too. I set what you said.
But the result has not changed. I changed variables. I tried different setups
in the context of what you wrote like lo_offset to 1MHz, 5MHz, bandwidth to
5MHz, 10MHz, master_clock_rate to 20MHz all this combin
Hi Henry,
Given that your main issue is that you get different results simply by
rotating your antenna 180 degree (and changing nothing else) and that if
you use a different transceiver, you get consistent results, I'm not sure
that the following will help. But, the following are some things I noti
Addition:
I think the problem is about LO leakage.
I made 4 different experiment.
First, I used just my B200 both receiver and transmitter and a specific
location which is the difference between 0 and 180 degree of Horn antenna is
2,5dB.
Second, I used just my B210 both receiver and transmitt
I am changing the distance between 1 and 1,5 meter. I usually change gain
settings. But I always make 100dB totals. Right now, RX=35, TX=65.
I used VNA as a signal generator. I set -20dBm signal in VNA and I ran my SDR
as receiver. Actually, the results are satisfactory. SDRs receiver seems okay
On 01/03/2023 09:30, henry.powell...@gmail.com wrote:
I don’t understand how this happen. Everythings are same, I just
change USRP.
First, I tried with USRP B200 and the difference between 0 and 180
degree is 3dB.
Then I plug Pico VNA, the difference is zero. Then I plug Nano VNA
(It’s 50
I don’t understand how this happen. Everythings are same, I just change USRP.
First, I tried with USRP B200 and the difference between 0 and 180 degree is
3dB.
Then I plug Pico VNA, the difference is zero. Then I plug Nano VNA (It’s 50
dollar VNA cheap.) the difference is zero.
I plug my other
Hello, I am sharing how i did it. I set lo_offset=20e3 then i am changing
center_frequency. Also thank you Marcus, have a nice day.
```
self.uhd_usrp_source_0.set_center_freq(uhd.tune_request(center_freq,
rf_freq=center_freq-lo_offset,
rf_
On 28/02/2023 01:20, henry.powell...@gmail.com wrote:
Hello, again.
I tried with step attenuators and the result is there was difference
around 2dB between 0 degree and 180 degree rotation of horn without
attenuator. When I connected the attenuators to rx and tx paths, the
difference raised
Hi Henry,
I am unsure if you tried with an "LO offset" or if you just changed your
center frequency. Changing the center frequency will not avoid the
problems which can occur at the LO frequency.
There are two ways you can create a CW signal that is offset from the LO
frequency. You can either c
Hello, again.
I tried with step attenuators and the result is there was difference around 2dB
between 0 degree and 180 degree rotation of horn without attenuator. When I
connected the attenuators to rx and tx paths, the difference raised around
10dB. When I change step of attenuator, I can decr
Is it possible that you are using a CW signal with no offset such that the
CW signal is right on top of the LO leakage? Perhaps the LO leakage
"interference" is causing problems. You could try this experiment with an
LO offset.
Rob
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On 23/02/2023 02:02, henry.powell...@gmail.com wrote:
I wanna make this operation in far-field so i calculated from (2D^2)/λ
and made this distance almost 2meter. My horns are good at 4GHz i am
working at this freq. I adjust RX and TX gain with range operator in
GNU, I mean for the observatio
I wanna make this operation in far-field so i calculated from (2D^2)/λ and made
this distance almost 2meter. My horns are good at 4GHz i am working at this
freq. I adjust RX and TX gain with range operator in GNU, I mean for the
observation I am changing gain. To see the signal, I need to make 7
On 23/02/2023 00:54, henry.powell...@gmail.com wrote:
Hello,
I connected 2 Horn antennas to USRPs ports as TX and RX. I made the
diagram on GNU Radio. I think diagram is okey. And I measured the
coaxial cables in VNA. There is no problem.
When I rotate RX antenna 45 degree in roll axis, I s
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