[Hackrf-dev] transmitting problem

[Mike]

I agree, I don't think the harmonics are causing it to not transmit - that
was just an aside.
I mentioned before that your generated signal file is a lot shorter than
the recorded signal, and wondered if it might be smaller than a buffer size
in hackrf_transfer/libhackrf. Could you try a larger file?

On 30 June 2015 at 16:11, Peter Shipley <peter.shipley at gmail.com> wrote:

> Was it the harmonics that prevented the hackrf from  transmiting then ?
>
> Oddly when eyeballing the data and gnuplot the data looks almost identical
> except for my data being perfectly centered, the higher & low frequency are
> exactly the same but for the phase shift.
>
> would that make any difference?
> On Jun 29, 2015 3:42 PM, "Michael Ossmann" <mike at ossmann.com> wrote:
>
>> On Sun, Jun 28, 2015 at 08:49:40AM -0700, Peter Shipley wrote:
>> >
>> > As you may have guessed, my generated IQ stream was made with a loop
>> > calling sin/cos and timing the transitions to times where I&Q can swap
>> > symmetrically ( without jumping ).
>> > what is then proper method for making phase transitions?
>>
>> One method is to smoothly lower the amplitude to zero at the transition
>> and then back up to full amplitude by mid-symbol.  This is done, for
>> example, in PSK31.  A simpler approach is to use an FIR low pass filter
>> on your waveform before transmission.
>>
>> Mike
>>
>
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