[Discuss-gnuradio] QPSK basic modulator

[karim]

Hi,
I need to implement a simple transmitter that uses QPSK as the 
demodulation mode. It should read data (characters) from a file and 
transmit them as they are without preamble or anything.

What's the simplest and fastest way to do it.
I checked the benchmark_tx.py it adds a preamble and a lot of data 
before the actual payload which I don't need.

Thanks
Karim