Re: [Discuss-gnuradio] gr-rds

[Marcus Müller]

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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