[Hackrf-dev] TX Trouble

2017-10-17 Thread wiemeyer 
Hello All,

I'm still having trouble transmitting from file, a car door clicker
waveform that I saved, similar to one of the tutorial videos.

For one thing, the TX light comes on when I start the flowgraph, but when
I close it, the light stays on.  Is that normal?

And, generally speaking, what are things to look for when debugging TX
problems?  I can think of two problems:  I'm not transmitting with enough
power, or I messed up the waveform somehow when I recorded it.

Regarding the first, I've tried setting the RF gain as high as it will go,
and I've tried different antenna lengths.

Regarding the second, I'm worried that I may have saturated HackRF when I
recorded the waveform.  Is there a way to tell, if I view the recorded
waveform in the QT GUI time domain plot?  Anything above 1 V or below -1
V?  I guess the waveform would look clipped, but it appears so quickly,
that it is hard to tell.  Same question on transmit:  how can I tell if I
am saturating?

I'm also aware of the trick in the video about multiplying by a constant
to increase SNR.  Any other ideas?

Thanks,

Brian


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Re: [Hackrf-dev] RX/TX switching

2018-04-12 Thread wiemeyer 
All,

Kind of a similar question, but instead of TXing from a file, is there a
way to hook up a microphone to a hackRF and transmit mic output (with a
carrier frequency and appropriate modulation), i.e., for ham radio.

Brian




On Thu, April 12, 2018 4:53 am, Matteo Terzi wrote:
> Hi Jake,
>
> I’m a newcomer to GRC and I’m trying to learn as much as I can with
> it. I
> installed GNU Radio Companion on Windows 7.
>
> In my flow I’d like to receive a signal, register it into a file, switch
> from RX to TX and suddenly transmit it. My problem is that I can’t
> create a
> flow to switch.
>
> In attachment you can find my program.
>
> Thanks for the support
>
> Matteo
>
>
> --
> Matteo TERZI
> Google Gmail Member
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> HackRF-dev mailing list
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>


-- 
Brian Wiemeyer
2395 Cherry Tree Rd.
Gurley, AL  35748
(256) 725-4429
wieme...@nehp.net

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