[Hackrf-dev] Is my new (old) HackRF Deaf?

[Cinaed Simson]

On 07/10/2017 09:36 PM, Jerry wrote:
> Jake
> 
>  
> 
> Thanks for the sound advice.  I have had spectrum analyzers and learned
> early to be careful with nearby RF sources ☹
> 
>  
> 
> Right now I am getting a wide confluence of signals between 98.5 and
> 101.5 on the FFT.  If it were my SA I would narrow the bandwidth to
> improve the signal resolution but on the Osmocom Source changing Ch0
> Bandwidth from 10 Hz to 500 Hz doesn’t appear to change the FFT display
> noticeably.
> 
>  
> 
> Attached is a picture.

The largest signal is the HackRF's DC offset.

The tutorials will show you how to avoid it.

-- Cinaed
> 
>  
> 
> Jerry NY2KW
> 
>  
> 
>  
> 
> *From:* HackRF-dev [mailto:hackrf-dev-bounces at greatscottgadgets.com] *On
> Behalf Of *Gavin Jacobs
> *Sent:* Monday, July 10, 2017 6:22 PM
> *To:* hackrf-dev at greatscottgadgets.com
> *Subject:* Re: [Hackrf-dev] Is my new (old) HackRF Deaf?
> 
>  
> 
> Jerry,
> 
> Learning how to use Ubuntu, and Gnu, and HackRF is a challenge! I went
> down that path about a year ago. The issue you describe hits every new
> user. When you are running GNU radio, you have to turn up the IF gain to
> about 40 - it defaults to 0. Also, turn up the BaseBand gain to about
> 30. Leave the RF gain at 0 (that setting is confusing; a value of 0 just
> means the RF LNA is left off; 14 means it is on; but you rarely need it
> on).
> 
>  
> 
> Also, a word of caution. Since you are a ham, you likely have an HT or a
> base station. You have to take care to never exceed the maximum field
> strength anywhere near the HackRF. I don't recall the exact spec, but
> basically if you transmit with a 5 Watt HT, right next to HackRF, you
> can fry the RF front end.
> 
>  
> 
> Hope that helps.
> 
> Jake
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *From:*HackRF-dev <hackrf-dev-bounces at greatscottgadgets.com
> <mailto:hackrf-dev-bounces at greatscottgadgets.com>> on behalf of Jerry
> Stern <jsternmd at att.net <mailto:jsternmd at att.net>>
> *Sent:* July 10, 2017 2:54:16 PM
> *To:* hackrf-dev at greatscottgadgets.com
> <mailto:hackrf-dev at greatscottgadgets.com>
> *Subject:* [Hackrf-dev] Is my new (old) HackRF Deaf?
> 
>  
> 
> Is my HackRF deaf?  I am a ham radio hobbyist and I bought a HackRF One
> to enhance my deeper learning of SDR but also as a broadband RF source. 
> To my dismay, installing the software has become days of learning Ubuntu
> basics and dealing with instructions that are at times outdated or
> nuanced towards a person with much more than basic Linux skills.  So, I
> gave up on Ubuntu only because it was faster for me to install and test
> with Windows 7.   My HackRF One (GreatScott) must have been a leftover
> as the firmware was dated 2014(August).  I installed the latest version
> HackRF tools and updated the firmware to Feb 2017.  I followed Mike's
> video tutorial for creating a basic GNU flow for FM and also installed
> SDR#.  I have very strong FM broadcast stations in my area which I can
> easily demodulate with my Rigol Spectrum analyzer using the ANT500.
> However both with GNU and SDR# my HackRF appears deaf in FM broadcast
> mode.  I read that a few years back there may have been some issues with
> cold solder joints on the HackRF pcb....  I have a lot of test equipment
> - from RF generators up to 2 GHz, etc but before I go that route is
> there something I am perhaps missing in my setup.  Not sure where or
> what details to provide here without overloading my question further .
> 
> 
> 
> Thanks
> 
> 
> 
> Jerry
> 
>  
> 
> 
> Sent from my iPhone
> 
> 
> 
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