[Hackrf-dev] HackRF One RX Gain issue ?

[Simon Kennedy]

Jason,
I haven't noticed any affect to Tx only to Rx as I believe the IC is
dedicated to Rx.
There is a good write up of the symptoms and how to fix it here:
http://www.t4f.org/articles/repairing-the-hackrf/

Simon.

On 3 December 2016 at 19:12, Jason c. <jlcook83 at hotmail.com> wrote:

> Thanks for the quick reply Simon, it's not the news I was hoping for.. but
> explains the sudden change in Rx behavior.
>
> Will this affect other modes of operation (i.e. Tx..?) is it the same amp
> IC?
>
> What have others done to resolve the problem, is it just the replacement
> of the one IC (I'm ok with SMD soldering) ?
>
> I hate to phrase it this way, but seems like a design flaw.. I understand
> the need for care and attention when using rf test tools, but I guess I
> expected a bit more robustness for the price paid..
>
> Jason
>
> Sent from my iPhone
>
> On Dec 3, 2016, at 6:12 AM, Simon Kennedy <simon at thekennedys.info> wrote:
>
> Yep, that's a sure symptom of having blown the RF amp.
>
> I did it when I forgot to turn off the HackRF and transmitted 50W at HF
> near it.
>
> Simon.
>
> On 3 Dec 2016 09:43, "Jason c." <jlcook83 at hotmail.com> wrote:
>
>> Hey group, just got my HackRF One today, playing around with it, I'm
>> pretty happy!
>>
>> However,  I'm Having a strange issue with the RX Gain control.  It seems
>> that when RX Gain is now set to anything above 0 (such as the expected
>> 14db), the RX amp appears to shut off, (signal strength drops!).  I
>> could have sworn earlier on today, I was seeing my signal strength increase
>> when switched to 14db....  anyone else experience this?
>>
>> I am using the osmocom in GRC to set the gain value.  One other thing to
>> note, I was playing around with a 2-way radio near HackRF unit trying to
>> get that to receive,  I don't think I would have gotten closer than 3-4
>> feet.  Could I have blown the Rx Amp in any way doing this?  I wouldn't
>> think so.... but could be wrong.  It's strange that when I expect the amp
>> to be turning ON, the Gain drops....  could this be a bad amp?
>>
>> JC
>>
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>>
>>
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