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From: | Kyeong Su Shin |
Subject: | Re: [Discuss-gnuradio] 802.11a capture with HackRF - Why am I not receiving signals anymore? |
Date: | Fri, 16 Aug 2019 06:02:26 +0000 |
Hello Eamon,
You should see something like this on your spectrum. I used QT Fosphor Sink (from gr-fosphor) instead of the QT GUI Frequency sink, because bursty packets are 'more visible' this way.
A few thing that you should do:
Also, you can actually damage the RF frontend of your SDR transceiver by putting it too close to strong RF emitters. Although I think the chance is low (I think most WiFi routers won't kill your HackRF so easily), but always be careful when you are putting
them close together.
I think WiFi has null subcarriers on the DC frequency, so you probably do not have to correct the DC term, but maybe you want to double-check that. If your DC term is correctly removed, you won't see any peak at the center of your "QT Frequency Sink" plot.
Regards,
Kyeong Su Shin
보낸 사람: Eamon Heaney <address@hidden> 대신 Discuss-gnuradio <discuss-gnuradio-bounces+ksshin=address@hidden>
보낸 날짜: 2019년 8월 16일 금요일 오전 10:21 받는 사람: Müller, Marcus (CEL) <address@hidden> 참조: address@hidden <address@hidden> 제목: Re: [Discuss-gnuradio] 802.11a capture with HackRF - Why am I not receiving signals anymore? Pic of the output from the QT GUI Frequency sink is shown below. I didn't see anything significantly different from this, even when I put the radio right up next to my home router.
I've been told that it would be a good idea to set a DC offset for my source, but I'm unsure how to calculate that, and it was working without an offset before.
On Mon, Aug 12, 2019 at 8:20 PM Müller, Marcus (CEL) <address@hidden> wrote:
Ah OK, but then it's *barely* enough for wifi. -- Eamon Heaney
Fleet Commander
President, Model UN at Virginia Tech
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