Thanks for your answer, Derek.
I got an attenuator between them.
Maybe i can ask in a different direction: I got problems with the
virtual interfaces provided by tunnel.py. Do I really need them?
In GRC there are the adresses of the USRPs inside the
USRP-source/sink-block, not any virtual interface adresses.
Maybe u can tell me, whether i should focus on gnuradio itself or try
to implement my project in GRC with creating blocks for my requirements?
Regards,
Henning
Quoting Derek Kozel <derek.kozel@ettus.com>:
> Hello Henning,
>
> I don't have advice on TDMA in GNU Radio, but want to step in and make sure
> that you have attenuation between the two B200's. The recommended maximum
> receive power on the B200 is -15 dBm and the transmit power is up to 10
> dBm. It sounds like you probably do have attenuation and aren't overdriving
> the ADCs given that you have a successful data link, but as a note to
> others reading the thread in the future 20 to 30 dB of attenuation is
> recommended as a safety measure to guard against accidental damage.
>
> Regards,
> Derek
>
> On Tue, Mar 29, 2016 at 1:52 AM, Henning Bredenberg <
> henning.bredenberg@tuhh.de> wrote:
>
>> Hi all,
>>
>> I'm using GNU-Radio for some weeks now and i try to implement a little
>> project. This list already helped me to get into it. Thanks for that.
>>
>> First step of my project now is to implement a simple tdma-frame using two
>> USRPs B200 connected via a coax cable. The first 20ms of a 80ms-frame are
>> assigned for me.
>> I used the tunnel.py, which builds a TAP-device. I got that working so far
>> and so i configured two virtual ethernet interfaces (gr0 and gr1) which i
>> can ping successfully. The aim is now to use this virtual interfaces to
>> emulate the occuring delays of my communication system in grc. Therefor i
>> tried to use the tdma_engine.py of pre-cog (grextras included) but some
>> issues occured due to the change from 3.6 to 3.7. I read about it in the
>> archives but it was all pretty outdated.
>> Are there any newer templates to implement a tdma structure? Or is it
>> advisable to use tdma_engine.py?
>>
>> best regards,
>> Henning
>>
>>
>>
>>
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