[Hackrf-dev] Hackrf Rx sensitivity

[Nader Omer]

Thanks dear Glen for info

I figured out some issues concerned my Hackrf sensitivity.
Some broadband local interference seem overloaded it.
 I followed the steps listed here 
1- Shut down every electrical equipments in my shack
2-  USB cable changed, several ferrite beads added over it. 
3- laptop ran on battery.
4- Ferrits beads added around the coax near hackrf .
5- Cancelling adapters between hackrf coax and antenna switch N-type connector fix instead. Yeees I succeeded to receive many satellites with Hackrf.
Here a link to short clip - receiving Amsat AO-86 audio beacon.
https://www.youtube.com/watch?v=L84ZUVkbm78


      From: Glen Overby <gpoverby at gmail.com>
 To: Nader Omer <st2nh at yahoo.com> 
Cc: "hackrf-dev at greatscottgadgets.com" <hackrf-dev at greatscottgadgets.com>
 Sent: Friday, January 15, 2016 6:38 AM
 Subject: Re: [Hackrf-dev] Hackrf Rx sensitivity
   

Yes, I've had some frustrations finding settings for the best sensitivity.  On VHF I've found I get the best sensitivity with the IF gain set to 40db and the baseband gain set to zero.  The baseband gain seems to bring up the noise level and obliterate signals. The preamp certainly helps but I've been wary of enabling it (or keeping it enabled) due to the blown preamp stories here.

I put a preamp based on the RFMD SPF 5043 (a board from g4ddk & wa5vjb) in front of the hackrf but without much success.  I did have some good results with the SPF5043 and a MAR-6, but I also got some oscillations at times.  I continue to experiment with that.

Glen, kc0iyt


On Thu, Jan 14, 2016 at 4:28 PM, Nader Omer via HackRF-dev <hackrf-dev at greatscottgadgets.com> wrote:

 Hi all
Any issues about hackrf receiving sensitivity ??
I crank up LAN and Amp to upper limit and still I found it very poor in sensitivity compare to other SDR devices.!!!
I used  HF antenna,Yagi Antenna,vertical antenna.
software SDRSHARP. SDR-RADIO and gqrx.
I'm thinking of front end pre-selector ?? Any suggestions.TU
Nader
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