[Hackrf-dev] obtaining RSSI from max2837

Benjamin Yap vivawariors at hotmail.com
Mon Jun 6 05:30:45 EDT 2016 

Hi Louie!

I'm studying HackRF's schematic as well. I'm not quite sure if you got the connections right. Pin32 (RSSI) of the MAX2837 seems to be connected directly to Pin2 (ADC0_1/ADC1_1) of the LPC4320 processor. According to the 2837 spec sheet, the RSSI is an analog signal ranging from 0.4 to 2.2V with a slope of 30mV per dB. The analog signal is likely digitised by the 4320 processor to give a digital value. I'm not quite sure if anything on the schematic suggests a connection with the CPLD/headers. Not sure if I missed out anything. Might be tricky to breakout that pin.

Ben

> From: hackrf-dev-request at greatscottgadgets.com
> Subject: HackRF-dev Digest, Vol 44, Issue 2
> To: hackrf-dev at greatscottgadgets.com
> Date: Fri, 3 Jun 2016 01:29:35 -0400
> 
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> Today's Topics:
> 
>    1. SDR# (i2NDT)
>    2. Re: SDR# (Micha? Byrecki)
>    3. obtaining RSSI from max2837 (Louie lu)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 2 Jun 2016 11:29:04 +0000 (UTC)
> From: i2NDT <i2ndt at yahoo.it>
> To: "hackrf-dev at greatscottgadgets.com"
> 	<hackrf-dev at greatscottgadgets.com>
> Subject: [Hackrf-dev] SDR#
> Message-ID:
> 	<1570916998.2473311.1464866944629.JavaMail.yahoo at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
> 
> hi!I am waiting for my HackRF One to be delivered next week and, in meantime, I need to choose a software for it!I am familiar with SDR# (and windozzz other sdr programs...) and wonder if I can also transmit with it.by the way, at the moment,? I need only to generate a "continuos wave" RF signal without modulation.
> thanks in advance
> best 73 
> dei2NDT Claudio?
> 
> ?i2NDT's Web Site?i2NDT's Grabber CompendiumIcom IC pcr-1000
> BigArgo V1.134 
> Locator JN45tq
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> ------------------------------
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> Message: 2
> Date: Thu, 02 Jun 2016 14:13:32 +0200
> From: Micha? Byrecki <michal.byrecki at techniline.com>
> To: "hackrf-dev at greatscottgadgets.com"
> 	<hackrf-dev at greatscottgadgets.com>
> Subject: Re: [Hackrf-dev] SDR#
> Message-ID: <1464869612.6317.86.camel at techniline.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Howdy Claudio,
> 
> If You want to go beyond widely used windows software like SDR# I'd
> suggest You to get in cope with GNU Radio Companion (aka grc). It's a
> GUI for interfacing DSP modules. Getting started reqires some time to
> familiarize with digital signal processing rules (like complex/float
> math, some sampling princples), but allows You to do a really nifty
> tricks with not only SDR radios, but the signals processing in general.
> 
> You may go visit HackRF website and check out Mike's tutorials. There is
> also a worthy set of videos by Balint Sebeer on YT:
> https://www.youtube.com/watch?v=N9SLAnGlGQs
> that really goes into details.
> 
> Regarding to the transmission - I've always been keen on receiving, so I
> cannot tell You much. Except, the HackRF circuit does not incorporate RF
> band-pass filters (no anti-aliasing mechanisms) and it may spoil Your
> transmitting signal with harmonics and other nasty things.
> 
> Cheers,
> Mike SP5BYK
> 
> 
> Dnia 2016-06-02, czw o godzinie 11:29 +0000, i2NDT via HackRF-dev pisze:
> > hi!
> > I am waiting for my HackRF One to be delivered next week and, in
> > meantime, I need to choose a software for it!
> > I am familiar with SDR# (and windozzz other sdr programs...) and
> > wonder if I can also transmit with it.
> > by the way, at the moment,  I need only to generate a "continuos wave"
> > RF signal without modulation.
> > 
> > 
> > thanks in advance
> > 
> > 
> > best 73 
> > 
> > de
> > i2NDT Claudio
> >  
> > 
> > 
> >  
> > i2NDT's Web Site 
> > i2NDT's Grabber Compendium
> > Icom IC pcr-1000
> > BigArgo V1.134 
> > Locator JN45tq
> > 
> > _______________________________________________
> > HackRF-dev mailing list
> > HackRF-dev at greatscottgadgets.com
> > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
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> Message: 3
> Date: Thu, 2 Jun 2016 14:34:23 +0000
> From: Louie lu <luyi_louie at hotmail.com>
> To: "hackrf-dev at greatscottgadgets.com"
> 	<hackrf-dev at greatscottgadgets.com>
> Subject: [Hackrf-dev] obtaining RSSI from max2837
> Message-ID: <DUB126-W81E400A64265F6C7EF5575E3580 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> Hi guys,
> I am trying to get RSSI measurement/value from max2837 on hackrf one board. 
> After reading max2837 programming guide, I know how to enable RSSI measurement. But after that, I am  not what I got is correct RSSI measurement.
> I am just wondering if there is any one here who successfully got RSSI value from max2837 on hackrf one. 
> Since I started this task, I have ran into following problems
> 1/ identifying RSSI pinWell, I can see the max2837 pin 32 is the RSSI output pin, But, where does it lead to? Looking at pcb schematic pdf file, it seems like this "RSSI pin32 (max2837) ---> P67/SGPIO12 (LPC4320) ---> Bank2F3M12 ( CPLD)". I am not sure if this is correct?
> 2/ If I am correct above, How to get RSSI value?Since RSSI pin 32 output signal is analog signal (I could be wrong here), How do I get voltage of pin 32 output signal via SGPIO12? I tried to connect oscilloscope to Bank2F3M12 PIN 21 on P28 but what display on the screen does not make any sense to me.
> Can anyone here help?
> 
> Cheers,Louie 		 	   		   		 	   		  
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