[Discuss-gnuradio] Re: fm_tx_2_daughterboards output 2nd board is AM!!

[anmar]

> I don't think anything's wrong.  What do you expect the output to be?

fm modulated signale on the scoop.

> The way you've got it set up, side A is modulating a 10 MHz carrier
> with a 600 Hz tone.  Side B is modulating a 12Mz tone with the sum of
> 350 + 440 Hz tones.

> 
> I'm assuming you've got two Basic Tx daughterboards installed, right?

yes

> While this is running, have you looked at all 4 outputs, the two on
> the A side and the two on the B side?  The two on the A side will be
> related.  One of them is shifted 90 degress from the other.  Likewise,
> the two on the B side are related.  One of them is shifted 90 degrees
> from the other.

ok i tryed that and indeed 90 degrees shift
> 
> Eric

how does the sample rate and the interp effect the output, should the 
sample rate be 64 MPS because we have two outputs.
i have read on the forum that we should not use 'set_freq(0, freq0)', 
but use
self.u.tune(self.subdev[side]._which, self.subdev[side], target_freq) 
insted. what are the differnt?

and can i want to use 10mhz low pass filter how can i add it to the 
code? how should i connect it to the sig? btw what is the function of 
the interleaver. 'intl = gr.interleave(gr.sizeof_gr_complex)'

thanks
anmar



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