Date   

locked Re: chip and airspyHF+

prog
 

On Fri, Feb 9, 2018 at 10:06 am, Pierre Martel wrote:
Will try to run it from the root user.. could fix the illegal call
The CPU does not support some DSP instructions we use in the the spyserver. No amount of hacking will fix that.


locked Re: chip and airspyHF+

Pierre Martel
 

yeah seen the havoc on the bbs. But been able to work on some stuff with that little machine.. Nothing fancy but I like the fact that it has a backup battery on it.. Headless it run pretty well. it all goes to hell with any of the 2 daughter board for hdmi or vga output.

Would have been fun to make this work. Was running all my command on sudo and the chip user.. Will try to run it from the root user.. could fix the illegal call


locked Re: chip and airspyHF+

David Ranch
 


Putting it another way, even if you were able to get it running, a CHIP isn't going to have enough CPU power to keep up.  There are other small SBCs out there that have enough CPU power to run something like SpyServer but they aren't cheap (if that's your goal).  The other thing to consider is that NTC as a company is essentially dead.  They have customers who paid for products over a year ago that have yet to receive anything and I don't think they ever will:

   https://bbs.nextthing.co/t/planning-for-the-inevitable/19958

Don't get me wrong.. I think the CHIP Pro is a great SBC for low power projects.  I have two of them but I've essentially abandoned them as they have no future, no OS maintenance, etc.  Sad to see but it's pretty hard to run a solvent business when your trying to sell $9 boards against the likes of all the Raspberry Pis, *berry clones, BeagleBones, Tinkerboards, etc.  Brutal market for sure.

--David
KI6ZHD



On 02/09/2018 03:43 AM, prog wrote:
On Fri, Feb 9, 2018 at 02:16 am, Pierre Martel wrote:
Illegal instruction
The CHIP is definitely not supported and it is not recommended for SDR in the first place, at least for the time being. It uses a very old CPU that is not worth the hassle for any developer.


Re: linux compatible softare that talks to Spy server #spyserver #raspberrypi

aburnham@...
 

thanks a bunch -- i can keep an eye on gqrx then and hope for the best.  i did a lot of reading and couldn't seem to pinpoint a product -- now i know why!

ab

On 02/08/2018 10:45 PM, Martin Smith via Groups.Io wrote:
As far as I know there is none yet, but there is code out there to access spyservers
https://github.com/opensatelliteproject/xritdemod/blob/master/demodulator/src/SpyServerFrontend.cpp

And gqrx may/might/should/could have support for spyserver at some future date "Note: Spyserver interface not yet supported" (ref: http://gqrx.dk/supported-hardware#airspy )



locked Re: chip and airspyHF+

w9ran <w9ran@...>
 

On 2/9/2018 8:58 AM, Pierre Martel wrote:
Well it has a better processor then a pi zero.
Pierre, my suggestion is to forget about the CHIP.  CPU aside it's power management scheme is extremely poorly implemented, resulting in random uncontrolled shutdowns and subsequent data corruption, especially if you're using the USB port.  All this is well documented on their forum (along with the lack of response from the company).   It is of course out of production now, perhaps to be replaced by a new design that has been promised for months but with no response to requests for updated information.    An overview of their bulletin board system will show that it's devolved to a place for venting frustration, complaining,  and threats against the company.    Find a convenient drawer to store your CHIP in and move to a decent SBC.

73, Bob W9RAN


locked Re: chip and airspyHF+

prog
 

On Fri, Feb 9, 2018 at 07:05 am, Pierre Martel wrote:
Well it has a better processor then a pi zero.
What's point?

thanks anyway for the answer. will still be trying..
Good luck.


locked Re: chip and airspyHF+

Pierre Martel
 

Well it has a better processor then a pi zero.

thanks anyway for the answer. will still be trying.. 


locked Re: chip and airspyHF+

Pierre Martel
 

DId try the magic sudo option as stated on the quick setup page ;-) not working either, but thanks for the answer ;-)


Re: RX_TOOLS alternatives

Ruben Navarro Huedo (EA5BZ)
 

I didnt find other


Re: HF+ This will keep things cool

prog
 

FYI, the tuner is AEC-Q100 compliant. Your PC will probably fail way before the HF+ starts losing its specs.


locked Re: chip and airspyHF+

prog
 

On Fri, Feb 9, 2018 at 02:16 am, Pierre Martel wrote:
Illegal instruction
The CHIP is definitely not supported and it is not recommended for SDR in the first place, at least for the time being. It uses a very old CPU that is not worth the hassle for any developer.


locked Re: chip and airspyHF+

Mark Bailey
 

For grins, try (for a problematic non-root permissions scenario):

$ sudo ./spyserver spyserver.config


HF+ This will keep things cool

Fred Vos
 

This will help keep thing cool on the Australian Summer 40+c.


Re: linux compatible softare that talks to Spy server #spyserver #raspberrypi

Martin Smith
 

As far as I know there is none yet, but there is code out there to access spyservers
https://github.com/opensatelliteproject/xritdemod/blob/master/demodulator/src/SpyServerFrontend.cpp

And gqrx may/might/should/could have support for spyserver at some future date "Note: Spyserver interface not yet supported" (ref: http://gqrx.dk/supported-hardware#airspy )


locked chip and airspyHF+

Pierre Martel
 

OK after a lot of digging and cursing and learning.

I've been able to install the latest version of libairspy.

compile it and went well.

then moded spyserver.config to fit with my airspyhf+

and when it start, all is ok. But as soon I try to connect sdrsharp to it i got this.
chip@chip:~$ ./spyserver spyserver.config
SPY Server v2.0.1629 - http://airspy.com
Reading the configuration file: spyserver.config
Listening for connections on 0.0.0.0:5555
Accepted client 192.168.1.121:52931 running SDR# v1.0.0.1637 on Microsoft Windows NT 6.2.9200.0
Device was sleeping. Wake up!
Acquired the device
Illegal instruction
chip@chip:~$

Anyone can point me in the right direction?


 


RX_TOOLS alternatives

Ronneil Camara <ronneilcamara@...>
 

I think rx_tools is a dead repo. The author has not answered for weeks now.

Aside from rx_tools, any other cli tools I can try?

Thanks!


Re: Impedance matching of Airspy R2 input #hardware

doug
 


On 02/08/2018 03:55 PM, David Eckhardt wrote:
Hit send from somewhere before I had finished...........................

Here's a good paper on the subject.  Antenna factors, at least in my 30+year experience in the EMC world, assumea 50+/- j0 ohm system throughouts.  Therefore, you can easily calculate the voltage based on a 50-ohm system.  I confess, the concept of antenna factor took me a while to get used to and it seems totally unique to the EMC world. 

You can rightfully argue that especially at the low end of our required measurement spectrum for RE, 30 to 45 MHz, unless the antenna includes loss matching , the impedance at the antenna terminals (the type-N connector to which we connect our coax) present anything but 50-ohms.  Once the frequency transitions to the log periodic portion, the antenna terminal impedance is pretty well defined and usually remains within the 2:1 circle on the Smith Chart.  The balun used in some designs between the actual antenna and the type-N connector does not help in leveling the raw antenna impedance to 50-ohms.  It just provides a lumped and broadbanded transistion from DM to CM.  So, especially at the low end, heaven knows what you are dealing with as far a a source impedance is concerned.  The antenna factor attempts to sweep this fact under the carpet in reflecting a rather badly responding antenna structure at the low end of the measurement spectrum (inefficiecnt antenna structure and bad mismatch to 50-ohms for the frequency).    

  https://www.com-power.com/application%20notes/AN-106%20Antenna%20Factor.pdf

My advice:  Just assume the input of the AirSpy is 50-ohms and apply the antenna factor and don't ask further questions.  That's basically what we do when using a spectrum analyzer or intervening preamp between the antenna and receiver.  If you're goosey about that, add attenuation to force a match to 50-ohms, especially at the low end, and take that out in your calculations of final measured field strength.  A 6 dB pad will bring you within the 2:1 circle no matter what the source impedance is (12 dB return loss). At least then, you will be assured of working in a 50-ohm system. 

There's a lot in EMC that goes against good engineering practices and basic EM physics, but, remember, all our directives, limits, measurement procedures, French documents, and....... are agreed upon and dictated by COMMITTEE.  This is the ONE SOLE REASON I refused to ever sit on a committee.  I could not abandon my physics upbringing and cave in to the 'committee rule'.  Have a serious read through of C-63.4 while wearing your rigorous physics and EM hat. ............ But,.....but,..........      the committee sez it's gospel.   Oh, yes, 3-meter EUT-to-antenna distance measurement distance dictated by our very own FCC???  For a table mounted EUT, according to 2D^2/lambda typically doesn't occur until 300 MHz!  The rest of the world dictates 10-meters which is only 1-wavelength at our lower limit for measuring RE, 30 MHz.  Certainly, at 1-wavelength, the wave impedance is still quite complex.  I give up.  And any of us who have been in the discipline are painfully aware that the dictated 'linear extrapolation' to account for different measurement distances does not hold true in practice.  I give up.       

Dave - WØLEV
EMC Design & Test, LLC


On Thu, Feb 8, 2018 at 8:24 PM, David Eckhardt <davearea51a@...> wrote:
Here's a good paper on the subject.  Antenna factors, at least in my 30+year experience in the EMC world, the impedance of the system is assumed to be 50+/- j0 ohms.  Therefore, you can easily calculate the voltage based on a 50-ohm system throughout.  I confess, the concept of antenna factor took me a while to get used to and it seems totally unique to the EMC world.  You can rightfully argue that espcially at the low end of our req ur ourth  

  https://www.com-power.com/application%20notes/AN-106%20Antenna%20Factor.pdf

On Thu, Feb 8, 2018 at 2:25 PM, <lucas.wennerholm@...> wrote:
Hello airspy friends!
I have recently started using the airspy R2 and I'm trying to build an antenna characterizer system with it. 

My problem: 
The antenna I'm using to measure EM fields has a detailed data sheet for it's Antenna factor which implies that I have to measure the voltage on the input of the airspy. Im using Gnuradio to get the IQ data but it's difficult to know what I'm seeing. Does anyone have any data on the input impedance as function of frequency for the airspy. Also what is the airspy actually measuring on it's ADC (It appears to be the revived power in milliwatts over some 50 ohm impedance)?
If anyone has answers to this please help!



--
Dave - WØLEV
Just Let Darwin Work

I apologize for repeating all of this, but the man is right. I did a lot of EMI measuring while employed at Ademco*, a manufacturer of burglar alarm equipment, much of which used RF

signals to transmit to a house alarm box (Short Range Radio) and some of which was designed to transmit to a distant receiver on a cell-tower or similar. (Long Range Radio.)** We obviously had

to meet FCC specifications in order to sell the products, which were retailed thru alarm dealers.  The 2d^2/Lambda rule was marginally met at 345 MHz, where our range was 3 meters,

but the antenna factor nonsense always blew my mind. (Of course, all the commercial test antennas came with antenna factor charts.)  Generally the test antenna was a dipole at the
'
low frequency. and a Yagi at tjhe 928/852 MHz end.  The Yagi at least provided some way to convert antenna gain into microvolts at the spectrum analyzer.  We also did some work in the

 4GHz band, and used a calibrated wide-band horn antenna. I don't remember now if it had antenna factors--it probably did. All of that was such nonsense! Let me have gain. any time!


*Ademco was purchased by Honeywell in about 2002 and still manufactures burglar alarm and other security equipment under the Honeywell name.
**That system has now been converted to use cellular frequencies and hardware. Ademco Long Range Radio is dead.


--doug, WA2SAY, retired RF Engineer



Re: Impedance matching of Airspy R2 input #hardware

David Eckhardt
 

Using SpectrumSpy which comes free with the download of SDR#, you can measure actual power.  It functions much like a spectrum analyzer and is good from about 20 MHz through 1.8 GHz.  In that respect, don't forget, there is always the substitution method reqiring a set of 1/2-wavelength dipoles.  But, the antenna factor of the basic dipole is pretty well defined.  Just be sure you are in the far field.  Given a power measurement in a 50-ohm system, you can easily calculate the voltage. 
Be sure you read what came after the accidental 'send' on my first reply. 

Dave - WØLEV 

On Thu, Feb 8, 2018 at 8:24 PM, David Eckhardt <davearea51a@...> wrote:
Here's a good paper on the subject.  Antenna factors, at least in my 30+year experience in the EMC world, the impedance of the system is assumed to be 50+/- j0 ohms.  Therefore, you can easily calculate the voltage based on a 50-ohm system throughout.  I confess, the concept of antenna factor took me a while to get used to and it seems totally unique to the EMC world.  You can rightfully argue that espcially at the low end of our req ur ourth  

  https://www.com-power.com/application%20notes/AN-106%20Antenna%20Factor.pdf

On Thu, Feb 8, 2018 at 2:25 PM, <lucas.wennerholm@...> wrote:
Hello airspy friends!
I have recently started using the airspy R2 and I'm trying to build an antenna characterizer system with it. 

My problem: 
The antenna I'm using to measure EM fields has a detailed data sheet for it's Antenna factor which implies that I have to measure the voltage on the input of the airspy. Im using Gnuradio to get the IQ data but it's difficult to know what I'm seeing. Does anyone have any data on the input impedance as function of frequency for the airspy. Also what is the airspy actually measuring on it's ADC (It appears to be the revived power in milliwatts over some 50 ohm impedance)?
If anyone has answers to this please help!




--
Dave - WØLEV
Just Let Darwin Work




--
Dave - WØLEV
Just Let Darwin Work


Re: Impedance matching of Airspy R2 input #hardware

David Eckhardt
 

Hit send from somewhere before I had finished...........................

Here's a good paper on the subject.  Antenna factors, at least in my 30+year experience in the EMC world, assumea 50+/- j0 ohm system throughouts.  Therefore, you can easily calculate the voltage based on a 50-ohm system.  I confess, the concept of antenna factor took me a while to get used to and it seems totally unique to the EMC world. 

You can rightfully argue that especially at the low end of our required measurement spectrum for RE, 30 to 45 MHz, unless the antenna includes loss matching , the impedance at the antenna terminals (the type-N connector to which we connect our coax) present anything but 50-ohms.  Once the frequency transitions to the log periodic portion, the antenna terminal impedance is pretty well defined and usually remains within the 2:1 circle on the Smith Chart.  The balun used in some designs between the actual antenna and the type-N connector does not help in leveling the raw antenna impedance to 50-ohms.  It just provides a lumped and broadbanded transistion from DM to CM.  So, especially at the low end, heaven knows what you are dealing with as far a a source impedance is concerned.  The antenna factor attempts to sweep this fact under the carpet in reflecting a rather badly responding antenna structure at the low end of the measurement spectrum (inefficiecnt antenna structure and bad mismatch to 50-ohms for the frequency).    

  https://www.com-power.com/application%20notes/AN-106%20Antenna%20Factor.pdf

My advice:  Just assume the input of the AirSpy is 50-ohms and apply the antenna factor and don't ask further questions.  That's basically what we do when using a spectrum analyzer or intervening preamp between the antenna and receiver.  If you're goosey about that, add attenuation to force a match to 50-ohms, especially at the low end, and take that out in your calculations of final measured field strength.  A 6 dB pad will bring you within the 2:1 circle no matter what the source impedance is (12 dB return loss). At least then, you will be assured of working in a 50-ohm system. 

There's a lot in EMC that goes against good engineering practices and basic EM physics, but, remember, all our directives, limits, measurement procedures, French documents, and....... are agreed upon and dictated by COMMITTEE.  This is the ONE SOLE REASON I refused to ever sit on a committee.  I could not abandon my physics upbringing and cave in to the 'committee rule'.  Have a serious read through of C-63.4 while wearing your rigorous physics and EM hat. ............ But,.....but,..........      the committee sez it's gospel.   Oh, yes, 3-meter EUT-to-antenna distance measurement distance dictated by our very own FCC???  For a table mounted EUT, according to 2D^2/lambda typically doesn't occur until 300 MHz!  The rest of the world dictates 10-meters which is only 1-wavelength at our lower limit for measuring RE, 30 MHz.  Certainly, at 1-wavelength, the wave impedance is still quite complex.  I give up.  And any of us who have been in the discipline are painfully aware that the dictated 'linear extrapolation' to account for different measurement distances does not hold true in practice.  I give up.       

Dave - WØLEV
EMC Design & Test, LLC


On Thu, Feb 8, 2018 at 8:24 PM, David Eckhardt <davearea51a@...> wrote:
Here's a good paper on the subject.  Antenna factors, at least in my 30+year experience in the EMC world, the impedance of the system is assumed to be 50+/- j0 ohms.  Therefore, you can easily calculate the voltage based on a 50-ohm system throughout.  I confess, the concept of antenna factor took me a while to get used to and it seems totally unique to the EMC world.  You can rightfully argue that espcially at the low end of our req ur ourth  

  https://www.com-power.com/application%20notes/AN-106%20Antenna%20Factor.pdf

On Thu, Feb 8, 2018 at 2:25 PM, <lucas.wennerholm@...> wrote:
Hello airspy friends!
I have recently started using the airspy R2 and I'm trying to build an antenna characterizer system with it. 

My problem: 
The antenna I'm using to measure EM fields has a detailed data sheet for it's Antenna factor which implies that I have to measure the voltage on the input of the airspy. Im using Gnuradio to get the IQ data but it's difficult to know what I'm seeing. Does anyone have any data on the input impedance as function of frequency for the airspy. Also what is the airspy actually measuring on it's ADC (It appears to be the revived power in milliwatts over some 50 ohm impedance)?
If anyone has answers to this please help!




--
Dave - WØLEV
Just Let Darwin Work



--
Dave - WØLEV
Just Let Darwin Work


Re: Impedance matching of Airspy R2 input #hardware

David Eckhardt
 

Here's a good paper on the subject.  Antenna factors, at least in my 30+year experience in the EMC world, the impedance of the system is assumed to be 50+/- j0 ohms.  Therefore, you can easily calculate the voltage based on a 50-ohm system throughout.  I confess, the concept of antenna factor took me a while to get used to and it seems totally unique to the EMC world.  You can rightfully argue that espcially at the low end of our req ur ourth  

  https://www.com-power.com/application%20notes/AN-106%20Antenna%20Factor.pdf

On Thu, Feb 8, 2018 at 2:25 PM, <lucas.wennerholm@...> wrote:
Hello airspy friends!
I have recently started using the airspy R2 and I'm trying to build an antenna characterizer system with it. 

My problem: 
The antenna I'm using to measure EM fields has a detailed data sheet for it's Antenna factor which implies that I have to measure the voltage on the input of the airspy. Im using Gnuradio to get the IQ data but it's difficult to know what I'm seeing. Does anyone have any data on the input impedance as function of frequency for the airspy. Also what is the airspy actually measuring on it's ADC (It appears to be the revived power in milliwatts over some 50 ohm impedance)?
If anyone has answers to this please help!




--
Dave - WØLEV
Just Let Darwin Work

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