Re: [Discuss-gnuradio] gr-rds

[Mike]

Hi Marcus,

I did some further testing. Took me some time unfortunately. The RDS
reception outside is slightly better. But I still got "Lost Sync" info
in the terminal window. However, I could see decoded information. I
can't fight the feeling, that I am missing quite a bit of sensitivity. I
did some more testing with a flowgraph from the gr-gsm packet in the
apps directory. There must be BTSs out there ;-). But I could not see
anything. I used the Ettus Log-Per antenna.

I want to check the hardware and make sure everything is working
correctly. But I will move my question concerning the hardware to the
USPR-users mailing list.

Best regards,
Mike

> Hi Marcus,
> 
> I hoped so, that is why I bought one ;-). I think the max is 73dB. The
> actual value I set with a slider is 90dB. Thus I am pretty much maxed
> out there. But like I wrote earlier, that is the only way to receive at
> least one station. Don't have good RF working conditions. Even cellular
> is a problem.
> 
> BR
> Mike
> 
> 
>> Hi Mike,
>> the B200 should usually be a little more reliable than the RTL dongles;
>> what gain setting are you using?
>>
>> Best regards,
>> Marcus
>>
>> On 08/25/2015 02:08 PM, Michael Thelen DK4MT wrote:
>>> Hi Andreas,
>>>
>>> thanks for the hint. However I am using a Ettus B200 and do not have
>>> access to a different SDR right now. I will test outside and then trying
>>> to find out what is going on.
>>>
>>> BR
>>> Mike
>>>
>>>
>>>> Hi Michael,
>>>>
>>>> i read your mail and i could remember i had a similar problem with a lot
>>>> of lost sync and bad block messages.
>>>>
>>>> My solution was to use a different RTL USB stick and to play with
>>>> antenna type / antenna position and the gain of the RTL stick.
>>>>
>>>> I used a "classical" lamda / 2 dipol UKW Radio antenna. The stick was a
>>>> noname.
>>>>
>>>> regards,
>>>> Andreas
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Am 23.08.2015 um 20:02 schrieb Michael Thelen DK4MT:
>>>>> Hi Marcus,
>>>>>
>>>>> thanks, tried your script and found out, that it is always a little bit
>>>>> uncomely if something is not really reproducible. This is the status:
>>>>>
>>>>> With your script I did not get the earlier error anymore. However with
>>>>> my original I did not get it either. Instead I get the following message
>>>>> in GRC:
>>>>> @@@@@ Sync State Detected
>>>>> @@@@@ Lost Sync (Got 50 bad blocks on 50 total)
>>>>>
>>>>> I do not get this message if I run your script. Both scripts though do
>>>>> not show RDS information. So before I steal somebody's time I wonder if
>>>>> one reason could be, that I can only receive one station really at the
>>>>> limit and only if I set gain to a max. I can hear fairly clear audio,
>>>>> but I am not sure if I can conclude from, that RDS decoding should work.
>>>>> I am pretty much insulated from RF at my place. What would be in favor
>>>>> by people being sensitive to EM waves, but for experimenting it is
>>>>> pretty bad.
>>>>>
>>>>> So I might gonna check this outside, where I can see in my car, that RDS
>>>>> reception is working on my radio and then I can compare. Just want to
>>>>> make sure we or you aren't chasing an error which might be based on poor
>>>>> reception.
>>>>>
>>>>> However the messages in the terminal have been there last time and the I
>>>>> copied to also were there. Still don't no if this is part of the problem
>>>>> though. Therefore probably more testing on my side.
>>>>>
>>>>> Best regards,
>>>>> Mike
>>>>>
>>>>>
>>>>>
>>>>>> Hi Mike,
>>>>>>
>>>>>> dashed only means "message port connection" rather than "item stream",
>>>>>> so that's nothing to worry about, usually.
>>>>>> So the bad news is that this is possible a GRC bug, which on the other
>>>>>> hand is good news, because it means that gr-rds isn't broken, GRC just
>>>>>> has a hard time correctly generating the python file.
>>>>>> Since that worked for me: can you try the attached python file?
>>>>>>
>>>>>> Best regards,
>>>>>> Marcus
>>>>>>
>>>>>> On 22.08.2015 11:26, Michael Thelen DK4MT wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I am using GNU Radio 3.7.7.2 and I checked out out and built gr-rds.
>>>>>>> However RDS Decoding is not working. I found that there are to two
>>>>>>> connections have dashed lines (see picture). And in the terminal all I
>>>>>>> get is Error: Cannot create connection. But I could not find a hint,
>>>>>>> what is going wrong. Can somebody tell me, what to check for?
>>>>>>>
>>>>>>> Best regards,
>>>>>>> Mike
>>>>>>>
>>>>>>>
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