Re: [Discuss-gnuradio] gmsk+fec

[Marcus Müller]

Hi Ekko,
that screenshot is too small to tell anything significant. Could you
1. use the screenshotting function of GRC (File->Screen Capture) and
2. post the resulting PNG e.g. to imgur.com, but don't resize it.

Best regards,
Marcus

On 12/27/2015 06:02 PM, Ekko wrote:

hello all

i have a simple GMSK modulation tx and rx chain in gnuradio.data is read from a file,and recieve demod into another file, this model works well

i would like to add convolutional encoding/decoding,and this is my grc,

​i got some problem

Using Volk machine: sse4_2_32

INFO: tried to set frame to 12000; max possible is 4096

INFO: cc_decoder: tried to set frame to 12000; max possible is 4096

FATAL: Missing a required length tag on port 0 at item #0

thread[thread-per-block[3]: <block fec_tagged_encoder (3)>]: Missing length tag.

i think that i am not using the fec in a correct way , so i want to ask is there someone who can give me some instruction about how to add a fec into gmsk,or how to use fec in gnuradio.

thank you 

--Ekko 

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