[Hackrf-dev] I Q signal on Oscilloscope

[Dominic Spill]

On 13 March 2016 at 10:12, ERNEST MATEY <ernestmatey310 at gmail.com> wrote:
>
> Thank you very much for ‎responds.
>
> I had connected to P9 on my hackrf board before.

Which pins did you connect to?

> But as expected a I see only a single signal. I cannot justify if that is the I component or the Q component. ‎However I am wanting to see both components ( two signals) for my analysis.   How can I do this tapping the base band from P9 as I did?

It looks like pins 4/6 are RX Q (-/+) and 5/7 are RX I (-/+)

> What are your suggestions for the levels on my oscilloscope?

I have no idea, I don't think it should be a problem at all, the
levels of those signals on HackRF are probably very small compared
with the voltages most scopes can handle.

Dominic

> Sent from my BlackBerry 10 smartphone.
>   Original Message
> From: Dominic Spill
> Sent: Sunday, March 13, 2016 9:27 AM
> To: ERNEST MATEY
> Cc: hackrf-dev
> Subject: Re: [Hackrf-dev] I Q signal on Oscilloscope
>
> On 13 March 2016 at 07:01, ERNEST MATEY <ernestmatey310 at gmail.com> wrote:
>>
>> I purchased HackRf one about a month ago. It is a great receiver.
>> However for my application, I need to analysis I Q signals on oscilloscope.
>> How can I get these two signals from the hackRF board
>>
>> The Q signal on one channel, and I signal on another channel.
>> How can I achieve this from the board?
>
> The P9 header on the board allows you to access the baseband [1].
> You'll need to make sure that the levels are appropriate for your
> scope, but I would imagine that they should be fine. You can see the
> hardware design files in the HackRF repository[2], and you should
> consult those for the pin connections.
>
> Thanks,
> Dominic
>
> [1] https://github.com/mossmann/hackrf/wiki/HackRF-One#expansion-interface
> [2] https://github.com/mossmann/hackrf/