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-boun...@greatscottgadgets.com] *On > Behalf Of *Gavin Jacobs > *Sent:* Monday, July 10, 2017 6:22 PM > *To:* hackrf-dev@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-boun...@greatscottgadgets.com > <mailto:hackrf-dev-boun...@greatscottgadgets.com>> on behalf of Jerry > Stern <jster...@att.net <mailto:jster...@att.net>> > *Sent:* July 10, 2017 2:54:16 PM > *To:* hackrf-dev@greatscottgadgets.com > <mailto:hackrf-dev@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 basics and dealing with instructions that are at times outdated or 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 > > > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > _______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
