[hpsdr] problems using WDSP library

[Warren C. Pratt]

Hello Eduardo,

My first suggestion is to test with the built-in "PreGen" signal 
generator, being sure to use a tone frequency inside the filter 
bandwidth you specify.  I see in your code that you have experimented 
with that before as you have commented-out some calls to it.

73,

Warren  NR0V


On 5/2/2017 5:00 AM, Eduardo Alonso wrote:
> Hello friends,
> Hello Matt,
>
> I am having problems in my first steps with WDSP library under linux.
> With the very minimal example that I copy below, everything runs fine.
> see: http://ea3ghs.qrp.cat/332-tx-fm.png
>
> But if I call SetTXABandpassFreqs(1,-3000,3000) the output signal 
> disappears !!!.
>
> This problem also appears in other modes than FM.
> I think I am not initializing correctly the library, but in
> the documentation says nothing about the correct (init) procedure.
>
> Could you give some clues?
> Thanks in advance,
> Eduardo EA3GHS
>
> //WDSP EXAMPLE
> //complete code: http://ea3ghs.qrp.cat/332c.tgz
> main()
> {
> SNDReset();
>
> OpenChannel(1, FRAMES, 2048, 48000, 48000, 48000, 1, 0, 0.010, 0.025, 
> 0.000, 0.010, 0);
> SetTXAMode(1,TXA_FM);
> TXASetNC(1, 2048);
> TXASetMP(1, 0);
> //SetTXABandpassFreqs(1,-3000,3000);  //if I activate this line, I 
> will have no output signal
> SetChannelState (1,1,1);
>
> while(1)
>     {
>     SNDRead(); //blocking read call
> for(i=0;i<BUF;i++){in[i]=(double)rdbuf[i];in[i]/=0x7fff;}
>     e=0; do {fexchange0(1,in,out,&e);} while(e);
>     for(i=0;i<BUF;i++){wrbuf[i]=(s16)(out[i]*0x7fff);}
>     SNDWrite();
>     }
> }
> //END
>
> ps:
> The library version is the Linux port from John Melton, and
> inside comm.h appears a "(C) 2017 Warren Pratt, NR0V, Jae Stutzman, K5JAE"
> see http://ea3ghs.qrp.cat/332c.tgz
>

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