[Hackrf-dev] HackRF One RX Gain issue ?

[Jason c.]

Perfect (not the blown amp!), but the article reference is..


Thanks again,

Jason

________________________________
From: simonhkennedy at gmail.com <simonhkennedy at gmail.com> on behalf of Simon Kennedy <simon at thekennedys.info>
Sent: December 3, 2016 1:40:06 PM
To: Jason c.
Cc: hackrf-dev
Subject: Re: [Hackrf-dev] HackRF One RX Gain issue ?

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<mailto: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<mailto: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<mailto: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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