Re: [Discuss-gnuradio] RX channel 1 out of range for configured RX frontends

[Marcus D. Leech]

On 03/18/2016 02:33 PM, Marcus Müller wrote:

Yes, the N210 take daughterboards, and in fact, they only take one RX and one TX daughterboard, or a single "full-sized duplex board".
Point is that with the Basic* and LF* boards, you can either use the I & Q signal lines combinedly as a single complex stream, or isolatedly as two real streams. However, as the latter totally "breaks standard behaviour", you have to specify a subdevice specification explaining how you want your channels to be mapped.

Best regards,
Macus

With the notable exception of the TVRX2, which has a low-IF, so can (and does) exercise both DDC channels in the N2xx, giving you two
  independently-tunable channels.

On 03/18/2016 06:06 PM, Nikos Balkanas wrote:

I stand corrected. Didn't even know that N210s took daugterboards :(​

Nikos

On Fri, Mar 18, 2016 at 6:39 PM, Martin Braun <address@hidden> wrote:

You *can* have 2 rx channels in an N210 (by means of dual DDC chains),
but you probably haven't set the subdev spec appropriately (Something
like 'A:0 A:0', depending on your daughterboard, check the UHD manual).

Cheers,
Martin

On 03/18/2016 08:53 AM, Nikos Balkanas wrote:
> Hi,
>
> You can have only 1 RX and 1 TX channel in a N210. You are asking for 2
> RX channels in your flow. Runtime complains that he can access only 1
> channel (Rx0).
>
> HTH,
> Nikos​
>
> On Fri, Mar 18, 2016 at 5:39 PM, SUGANYA M <address@hidden
> <mailto:address@hidden>> wrote:
>
>     Hi All,
>     I am using GNU Radio Companion 3.7.5 and USRP N210.
>     When I implemented a simple flow graph of SIMO system with two
>     channels using USRP source block ( attached grc flow graph snapshot
>     for reference),
>     I am getting following error:
>
>     Traceback (most recent call last):
>       File "/home/student/SUGAN/ONE_TWO.py", line 130, in <module>
>         tb = ONE_TWO()
>       File "/home/student/SUGAN/ONE_TWO.py", line 72, in __init__
>         channels=range(2),
>       File
>     "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py",
>     line 122, in constructor_interceptor
>         return old_constructor(*args)
>       File
>     "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py",
>     line 1740, in make
>         return _uhd_swig.usrp_source_make(*args)
>     RuntimeError: LookupError: IndexError: multi_usrp: RX channel 1 out
>     of range for configured RX frontends
>
>     Can anyone help me to fix this error?
>     Thanks in advance
>
>     Regards,
>     Suganya.M
>
>
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