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From: | Urban Kuhar |
Subject: | Re: [Discuss-gnuradio] USRP N200 + SBX - problem receiving signal |
Date: | Tue, 15 Nov 2011 09:18:42 +0100 |
Hello!
Sorry for a bit late response. Regarding my problem
1. Yes I can see the signal that I am transmiting with spectrum analyzer
2. I tried all possible combinations for RX antenna
3.I have tried increasing RX gain
I attached my GRC flowgraph.
Does that mean you have confirmed transmission with a spectrum analyzer?
On 11/11/2011 07:37 AM, Urban Kuhar wrote:
> Hello!
>
> I've recenty got two USRP N200 with SBX daughter boards. I have managed to
> transmit simple sine signal with one USRP but I have problems receiving
Can you tell more information, or send your GRC flowgraph?
> this signal. I dont see anything but noise in spectrum. I have measured
> signal that I am transmiting with spectrum analyzer and I see a spike in
> spectrum, so the transmiter must be working.
>
> I am using UHD source and sink blocks as a "top layer" for USRP devices,
> and WX GUI FFT block for displaying spectrum. Sine frequency is 1kHz and I
> am samping with 200kHz. I have set the center frequency on 500MHz. I have
> tried both antenna ports on receiving device.
>
> Is there some setting that I am missing?
What frequency, what digital amplitude, gains, etc...
If I can make some suggestions:
* Digital amplitude should be max magnitude 1.0, start with something
way lower like 0.3.
* Use a larger sample rate, at least 1Msps. This can make it easier to
debug.
* Did you pick the correct RX antenna?
* Have you tried increasing RX gain?
-Josh
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