[Hackrf-dev] Testing my new HackRF One

[Emmanuel Fusté]

Le 22/08/2014 15:37, Michael Ossmann a écrit :
> That's good news!  (faulty ANT500 instead of faulty HackRF One)
>
> There is a good chance that you can correct the antenna fault yourself.
> Carefully unscrew the metal shield of the SMA connector from the black
> plastic section.  You'll probably find that the spring inside is damaged
> or out of place.  It should form a connection through the shield without
> touching the shield.  If you adjust it and reassemble, the antenna may
> work properly.
>
> It is possible to test for this condition with a continuity tester or
> multimeter.  The telescopic section should have continuity through to
> the pin within the SMA connector.  Neither the telescopic section nor
> the pin should have continuity to the shield.
>
> If it still doesn't work, I'll replace it for you.
>
> Mike
Antenna repaired !
The last turn of the spring was touching the shield because the part 
that goes into the pin of the SMA connector was not centered.
Pictures to show the pblm and the fix:
https://lh5.googleusercontent.com/yY5zip6eMtzyup5aV8LOnfLNGLOE11yACLOM8jAJ5kk=w303-h208-p-no
https://lh4.googleusercontent.com/zgH__V7KMO262hg8IB_BS2MuraoiJUTgt5MvTmTxhQc=w264-h208-p-no
https://lh3.googleusercontent.com/c2TfTqSiPrf0MM0zIndxtF9sDzno9O5iyre1CrrzdFQ=w242-h208-p-no

Now could listen some FM broadcast stations even if the conditions are 
not ideal (HackRF under the desk in harsh RF environment in a bad 
building). The HackRF One is definitively in good conditions.

Emmanuel.
>
>
> On Fri, Aug 22, 2014 at 03:01:53PM +0200, emmanuel.fuste at laposte.net wrote:
>>
>> Hello,
>>
>> Somme news :
>> - Antenna is dead !! short circuit.
>> - with a small piece of wire (~30cm)I was able to (only)receive a very very close FM broadcast station. Need to test with a good antenna now. But with the same wire, signal in the DVB-T band is pretty good.
>>
>> Emmanuel.
>>
>> ---
>>
>> ----- Mail original -----
>>
>>> Hello,
>>> As Jon B and Larry, I got my HackRF One working under GQRX, GNURadio &
>>> gr-osmosdr (Debian Sid and Pentoo) but got only noise and a flat spectra.
>>> I was very worried that the RF stage is dead (sorry Michael for the hurry
>>> ...).
>>> But as I was not alone, and with the drastic fab validation Michael put in
>>> place, the problem is surely not there...
>>> - Tomorrow, I will try to play a bit more with the gain settings. I was a bit
>>> shy and did not push the settings too far.
>>> - Will test the antenna, perhaps this is the same problem as Jon ?
>>> With my 868Mhz alarm remote fired at 1m50, I see the transmission pulse, but
>>> with a very very low signal. An antenna problem is a good track : the signal
>>> strength is the same with and without antenna !!
>>> Whatever I will find, it deserve a small "RF validation procedure for
>>> beginner" tutorial.
>>> I hope it will only be a big fright...
>>> Emmanuel.
>>> ---
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