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

[Mike Jameson]

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
>>>>>
>>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>
>
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