[Hackrf-dev] FM receive difference between HackRF and RTL-SDR

[Mehdi Asgari]

I'd already updated the SPI. I upadted the CPLD too.
I managed to get a good quality in GRC (before  updating), but not in Gqrx.
What would you do in this scenario? What should be checked to make sure
everything is OK?
Could this be a problem if Gqrx?

On Mon, Sep 22, 2014 at 6:49 PM, Mike Jameson <mike at scanoo.com> wrote:

> Have you updated both the 'SPI Flash' and 'CPLD' firmware and rebooted the
> hackrf in between?  Instructions below:
>
> https://github.com/mossmann/hackrf/wiki/Updating-Firmware
>
> Mike
>
> --
> Mike Jameson M0MIK BSc MIET
> Email: mike at scanoo.com
> Web: http://scanoo.com
>
> On Mon, Sep 22, 2014 at 4:00 PM, Mehdi Asgari <mehdi.qbic at gmail.com>
> wrote:
>
>> Thank you Mike.
>> I tried the above items, but there's no significant change in result.
>> I can clearly hear the radio, but it still comes with noise (In fact I've
>> played with every config that I thought is related, but I can't reach the
>> same quality level that I am receiving via RTL-SDR)
>>
>> On Mon, Sep 22, 2014 at 6:04 PM, Mike Jameson <mike at scanoo.com> wrote:
>>
>>> Some things to try:
>>>
>>> 1) Make your antenna as small as possible as you may be overloading it.
>>> Broadcast FM stations are strong!
>>> 2) Reduce the gain on all three gqrx gain controls (RF,IF & BB).  Try
>>> just raising IF until the signal appears.
>>> 3) Set the center frequency to something slightly above or below the
>>> target frequency and click on the wanted frequency.
>>> 4) Set the sampling rate to 10e6 (10M)
>>> 5) Start GQRX using a fresh config with 'gqrx -r'
>>>
>>> Mike
>>>
>>> --
>>> Mike Jameson M0MIK BSc MIET
>>> Email: mike at scanoo.com
>>> Web: http://scanoo.com
>>>
>>> On Mon, Sep 22, 2014 at 3:18 PM, Mehdi Asgari <mehdi.qbic at gmail.com>
>>> wrote:
>>>
>>>> Hmmm, I am using the last version of tools (and I don't know how should
>>>> I change the magnitude)
>>>> By the way, why the same setup in Gqrx produces different outputs for
>>>> RTL-SDR and HackRF One?
>>>> Here's a link to two screenshots from Gqrx window which may be helpful.
>>>> HackRF: http://i60.tinypic.com/o7127d.png
>>>> RTL-SDR: http://i57.tinypic.com/10r79lc.jpg
>>>>
>>>> Thanks
>>>> Mehdi
>>>>
>>>> On Mon, Sep 22, 2014 at 4:54 PM, Simon IJskes <simon at ijskes.org> wrote:
>>>>
>>>>> The experience sounds the same as my first attempt, under linux, with
>>>>> the old osmosdr software, where the magnitude of the signal was incorrectly
>>>>> assumed to be unsigned.
>>>>>
>>>>> After fixing this, it all sounded a whole lot better.
>>>>>
>>>>> Maybe this is also the case in your setup?
>>>>>
>>>>> Gr. Simon
>>>>>
>>>>>
>>>>> On 22-09-14 15:08, Mehdi Asgari wrote:
>>>>>
>>>>>> Hi
>>>>>> I am a beginner in SDRs (and DSP)
>>>>>> For the first sample, I'm, trying to build a FM receiver. I've tried
>>>>>> both RTL-SDR and HackRF One (with both GNU Radio and Gqrx)
>>>>>> I can easily get the desired station (on 88.0 MHZ) without noise on
>>>>>> RTL-SDR (using Gqrx or GRC)
>>>>>> But when I use HackRF One (with Gqrx or GRC), I can get the radio, but
>>>>>> it's noisy.
>>>>>> Is is because HackRF's higher sensitivity or does it need more
>>>>>> adjustment to work fine?
>>>>>>
>>>>>> Note 1: I am using GNU Radio Live DVD and HackRF One with firmware
>>>>>> 2014.08.1 and RTL-SDR (RTL2832)
>>>>>> Note 2:
>>>>>> Link for using RTL-SDR with GRC:
>>>>>> http://www.instructables.com/id/RTL-SDR-FM-radio-receiver-
>>>>>> with-GNU-Radio-Companion/?ALLSTEPS
>>>>>> Link for using HackRF with GRC: Mike's lesson 1
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> HackRF-dev mailing list
>>>>>> HackRF-dev at greatscottgadgets.com
>>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> HackRF-dev mailing list
>>>>> HackRF-dev at greatscottgadgets.com
>>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> HackRF-dev mailing list
>>>> HackRF-dev at greatscottgadgets.com
>>>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>>>
>>>>
>>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist9.pair.net/pipermail/hackrf-dev/attachments/20140922/47efc1af/attachment.html>