Date   
Re: Airspy noise figure

david@...
 

Thanks Dave,

Could you tell me a little more about how you measured NF?

Thanks,

David

On 12/03/18 08:37, David Eckhardt wrote:
I've measured both the R1 and my present R2.  They both come in around 4 dB.  I believe 7 to 8 dB is a bit much based on my experience with them.
Dave - WØLEV
On Sun, Mar 11, 2018 at 9:34 PM, <david@... <mailto:david@...>> wrote:
Hi - I've been setting up a system to measure noise figures of SDRs
in real time, an extension of some similat tests we performed a few
years ago:
https://www.rowetel.com/?p=5057 <https://www.rowetel.com/?p=5057>
I'm getting a NF of 7-8dB for a new Airspy R2 and Airspy mini.  The
spec quotes 3.6dB.  Has anyone else measured the NF?
I note the 3.6dB figure is exactly the same as the front end tuner
R820 tuner.  However a system noise figure will always be poorer
than the front end device.
Thanks,
David
--
*Dave - WØLEV
*
*/Just Let Darwin Work/*

Re: Airspy noise figure

David Eckhardt
 

I've measured both the R1 and my present R2.  They both come in around 4 dB.  I believe 7 to 8 dB is a bit much based on my experience with them. 

Dave - WØLEV

On Sun, Mar 11, 2018 at 9:34 PM, <david@...> wrote:

Hi - I've been setting up a system to measure noise figures of SDRs in real time, an extension of some similat tests we performed a few years ago:

  https://www.rowetel.com/?p=5057

I'm getting a NF of 7-8dB for a new Airspy R2 and Airspy mini.  The spec quotes 3.6dB.  Has anyone else measured the NF?

I note the 3.6dB figure is exactly the same as the front end tuner R820 tuner.  However a system noise figure will always be poorer than the front end device.

Thanks,

David




--
Dave - WØLEV
Just Let Darwin Work

Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

WReeve
 

Niceto - Thanks for looking at this problem. I previously reported USB noise in the spectrum at but received no reply.

I just spent 3 hours in my lab testing various USB cables and ferrite beads. For these tests I terminated the R2 receiver in 50 ohms to eliminate a noise path to the RF input. Most of my tests were with new Volutz USB cables, 1 m and 5 m long, and Fair-Rite clamp-on beads, 31 and 61 mix..

I confirmed what I had suspected before: The USBs and ferrite chokes have only a minor or negligible effect. Instead, the spyserver software or receiver is inconsistent. USB noise can be made to come and go simply by stopping and then starting SDR#.

See attached screenshots. For these, I simply started and stopped the spyserver using SDR# Connect/Disconnect button and Play/Stop button. I did not touch the physical setup in any way. And I could replicate the good and bad spectrum with any cable and any configuration of ferrite beads. In other words.the cable or ferrite chokes had nothing to do with it.

I found that I can almost always make the USB visible or invisible by pressing in order Connect, Play, Connect again (to disconnect) and then Play again, waiting a few seconds between each press. If the noise is there, repeat the sequence and the noise will be gone. Sometimes simply pressing Play, Stop, Play will do it.






--
--
Whitham D. Reeve
Anchorage, Alaska USA
--

Airspy noise figure

david@...
 

Hi - I've been setting up a system to measure noise figures of SDRs in real time, an extension of some similat tests we performed a few years ago:

  https://www.rowetel.com/?p=5057

I'm getting a NF of 7-8dB for a new Airspy R2 and Airspy mini.  The spec quotes 3.6dB.  Has anyone else measured the NF?

I note the 3.6dB figure is exactly the same as the front end tuner R820 tuner.  However a system noise figure will always be poorer than the front end device.

Thanks,

David

Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

Patrick
 

Thanks for the tip Dave ;-)

Regards,
Pat

2018-03-11 21:54 GMT+01:00 D R via Groups.Io <robsond90@...>:

Hi Patrick - I got the name wrong: it's BlitzWolf, not Wolfblitz!!  Just search for

BlitzWolf AmpCore Turbo BW-MC8 2.4A Braided Durable Micro USB Charging Data Cable 6ft/1.8m

and they'll pop straight up.  I bought three @ 1.8m and two @ 1m, and delivery took 8-10 days.  (Just make sure you don't order Type-C by mistake!)

Regards,
Dave



From: Patrick <aunumero73@...>
To: main@airspy.groups.io
Sent: Sunday, 11 March 2018, 20:45
Subject: Re: [airspy] USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

Hi Dave,

Could you please provide the reference of the shielded cable you mention ?
Thanks.

2018-03-11 21:39 GMT+01:00 D R via Groups.Io <robsond90=yahoo.co.uk@groups.io>:
Hi David,

I'm currently using Wolfblitz shielded cables I bought on Banggood, and I've found them to be very good indeed.  I've been running an ELAD S2, an RSP1A and an HF+ simultaneously without a trace of PC/USB noise on any of them, whereas previously it took a ton of ferrite to get rid of about 90% of it - on supposedly "good quality" cables.  No ferrite is needed on the new cables.

I think they are only made with microUSB or Type-C connectors at the device end, so I had to get a couple of microUSB to Type B adapters for the S2 and RSP1A, but they don't appear to have compromised the end to end shielding.  They aren't expensive when bought direct, and are well worth a look.

Regards,
Dave



From: David Ranch <airspy-groupsio@...>
To: main@airspy.groups.io
Sent: Sunday, 11 March 2018, 16:44
Subject: Re: [airspy] USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi


Hello EA5ZL,

Thanks for taking the time to write this up and it's quite illuminating to see how poor some of those cables are.  I too have run into cables that LOOK like their quality made with built-in ferrites on both ends, etc. only to find their crap.  I wish we could find a reliable source of "RF tight" cables that both consistently good and aren't outrageously priced.

Anyway.. I look forward to your results on the OrangePi to see if it's any better.  Btw.. why the OrangePi vs. say a Tinkerboard or a Pine64 or other?  There are SO many SBCs out there now but it's impossible to beat the community and support found with the Raspberry Pi boards.

--David
KI6ZHD







Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

D R
 

Hi Patrick - I got the name wrong: it's BlitzWolf, not Wolfblitz!!  Just search for

BlitzWolf AmpCore Turbo BW-MC8 2.4A Braided Durable Micro USB Charging Data Cable 6ft/1.8m

and they'll pop straight up.  I bought three @ 1.8m and two @ 1m, and delivery took 8-10 days.  (Just make sure you don't order Type-C by mistake!)

Regards,
Dave



From: Patrick <aunumero73@...>
To: main@airspy.groups.io
Sent: Sunday, 11 March 2018, 20:45
Subject: Re: [airspy] USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

Hi Dave,

Could you please provide the reference of the shielded cable you mention ?
Thanks.

2018-03-11 21:39 GMT+01:00 D R via Groups.Io <robsond90@...>:
Hi David,

I'm currently using Wolfblitz shielded cables I bought on Banggood, and I've found them to be very good indeed.  I've been running an ELAD S2, an RSP1A and an HF+ simultaneously without a trace of PC/USB noise on any of them, whereas previously it took a ton of ferrite to get rid of about 90% of it - on supposedly "good quality" cables.  No ferrite is needed on the new cables.

I think they are only made with microUSB or Type-C connectors at the device end, so I had to get a couple of microUSB to Type B adapters for the S2 and RSP1A, but they don't appear to have compromised the end to end shielding.  They aren't expensive when bought direct, and are well worth a look.

Regards,
Dave



From: David Ranch <airspy-groupsio@...>
To: main@airspy.groups.io
Sent: Sunday, 11 March 2018, 16:44
Subject: Re: [airspy] USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi


Hello EA5ZL,

Thanks for taking the time to write this up and it's quite illuminating to see how poor some of those cables are.  I too have run into cables that LOOK like their quality made with built-in ferrites on both ends, etc. only to find their crap.  I wish we could find a reliable source of "RF tight" cables that both consistently good and aren't outrageously priced.

Anyway.. I look forward to your results on the OrangePi to see if it's any better.  Btw.. why the OrangePi vs. say a Tinkerboard or a Pine64 or other?  There are SO many SBCs out there now but it's impossible to beat the community and support found with the Raspberry Pi boards.

--David
KI6ZHD






Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

Patrick
 

Hi Dave,

Could you please provide the reference of the shielded cable you mention ?
Thanks.

2018-03-11 21:39 GMT+01:00 D R via Groups.Io <robsond90@...>:

Hi David,

I'm currently using Wolfblitz shielded cables I bought on Banggood, and I've found them to be very good indeed.  I've been running an ELAD S2, an RSP1A and an HF+ simultaneously without a trace of PC/USB noise on any of them, whereas previously it took a ton of ferrite to get rid of about 90% of it - on supposedly "good quality" cables.  No ferrite is needed on the new cables.

I think they are only made with microUSB or Type-C connectors at the device end, so I had to get a couple of microUSB to Type B adapters for the S2 and RSP1A, but they don't appear to have compromised the end to end shielding.  They aren't expensive when bought direct, and are well worth a look.

Regards,
Dave



From: David Ranch <airspy-groupsio@...>
To: main@airspy.groups.io
Sent: Sunday, 11 March 2018, 16:44
Subject: Re: [airspy] USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi


Hello EA5ZL,

Thanks for taking the time to write this up and it's quite illuminating to see how poor some of those cables are.  I too have run into cables that LOOK like their quality made with built-in ferrites on both ends, etc. only to find their crap.  I wish we could find a reliable source of "RF tight" cables that both consistently good and aren't outrageously priced.

Anyway.. I look forward to your results on the OrangePi to see if it's any better.  Btw.. why the OrangePi vs. say a Tinkerboard or a Pine64 or other?  There are SO many SBCs out there now but it's impossible to beat the community and support found with the Raspberry Pi boards.

--David
KI6ZHD




Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

D R
 

Hi David,

I'm currently using Wolfblitz shielded cables I bought on Banggood, and I've found them to be very good indeed.  I've been running an ELAD S2, an RSP1A and an HF+ simultaneously without a trace of PC/USB noise on any of them, whereas previously it took a ton of ferrite to get rid of about 90% of it - on supposedly "good quality" cables.  No ferrite is needed on the new cables.

I think they are only made with microUSB or Type-C connectors at the device end, so I had to get a couple of microUSB to Type B adapters for the S2 and RSP1A, but they don't appear to have compromised the end to end shielding.  They aren't expensive when bought direct, and are well worth a look.

Regards,
Dave



From: David Ranch <airspy-groupsio@...>
To: main@airspy.groups.io
Sent: Sunday, 11 March 2018, 16:44
Subject: Re: [airspy] USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi


Hello EA5ZL,

Thanks for taking the time to write this up and it's quite illuminating to see how poor some of those cables are.  I too have run into cables that LOOK like their quality made with built-in ferrites on both ends, etc. only to find their crap.  I wish we could find a reliable source of "RF tight" cables that both consistently good and aren't outrageously priced.

Anyway.. I look forward to your results on the OrangePi to see if it's any better.  Btw.. why the OrangePi vs. say a Tinkerboard or a Pine64 or other?  There are SO many SBCs out there now but it's impossible to beat the community and support found with the Raspberry Pi boards.

--David
KI6ZHD



Re: Airspyhf+ flashing

f1hdi
 

Hello,

The clue on my side was to move on a USB2 port on one of my computers.

73 Jean-Marc


Le 11/03/2018 à 20:47, Mark Taylor a écrit :

Hi,

Thanks for all the ideas:  Here's what I've done.  Cumulative and stopping with each step to try.  So far no luck.

- Scraped the erase pads and re erased the unit, being careful to hold it for a full 1 second.  Took all external devices off my laptop.  Checked the computer that Port 10, 11, 12 wasn't in use.  (In fact no ports were listed.) Same as previously.
- Changed cable.  Same as previously.
- turned off virus protection, internet, and firewall.  Same as previously.

I think those were the relevant suggestions I hadn't tried before.

Repeated this on 2 other computers with same responses - 1 laptop and 1 desktop.  Originally on a MSI laptop, then a Lenovo laptop, then a HP desktop.

It's pretty clear that the flash software isn't finding the unit even with downloading the flash software to 3 machines.

Other suggestions?

Thanks

Mark


On Sun, Mar 11, 2018 at 9:55 AM, Alberto I2PHD <i2phd@...> wrote:

Just a small note based on my personal experience. At first, shorting the two "Erase" pads as shown in the photo did not work...
Then I realized that maybe the pads could have been covered by a transparent layer of protective (and insulating...) paint.
I disconnected the unit from the USB port, and gently scraped the top of the two pads so to expose the bare solder.
Then I reconnected the unit to the USB port, and repeat the shorting procedure.
This time everything worked as it should, and was able to correctly flash the firmware.
 
--
73 Alberto I2PHD
Credo Ut Intelligam




Re: Airspyhf+ flashing

Mark Taylor
 

Hi,

Thanks for all the ideas:  Here's what I've done.  Cumulative and stopping with each step to try.  So far no luck.

- Scraped the erase pads and re erased the unit, being careful to hold it for a full 1 second.  Took all external devices off my laptop.  Checked the computer that Port 10, 11, 12 wasn't in use.  (In fact no ports were listed.) Same as previously.
- Changed cable.  Same as previously.
- turned off virus protection, internet, and firewall.  Same as previously.

I think those were the relevant suggestions I hadn't tried before.

Repeated this on 2 other computers with same responses - 1 laptop and 1 desktop.  Originally on a MSI laptop, then a Lenovo laptop, then a HP desktop.

It's pretty clear that the flash software isn't finding the unit even with downloading the flash software to 3 machines.

Other suggestions?

Thanks

Mark


On Sun, Mar 11, 2018 at 9:55 AM, Alberto I2PHD <i2phd@...> wrote:

Just a small note based on my personal experience. At first, shorting the two "Erase" pads as shown in the photo did not work...
Then I realized that maybe the pads could have been covered by a transparent layer of protective (and insulating...) paint.
I disconnected the unit from the USB port, and gently scraped the top of the two pads so to expose the bare solder.
Then I reconnected the unit to the USB port, and repeat the shorting procedure.
This time everything worked as it should, and was able to correctly flash the firmware.
 
--
73 Alberto I2PHD
Credo Ut Intelligam



Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

ea5ehs@...
 

Hello David,
I decided to go de Orange Pi UNO way for different reasons; low cost, Gigabit ethernet outside the usb bus, only one usb 2.0 port. 
My theory about the usb qrm from cables is that there is a RPI USB design allowing for this. I have tested one Rpi2B and two Rpi3B with identical results.
QRM is only generated when an active data connection is on, ie when a client connects to spyserver and start sdr#. 
When I connect the airspy HF+ to a usb port of my Laptop and rin SDR#, no noise is generated with any of the six tested cables' using the same antennas.
I was considering the Tinkerboard SBC but as I'm runing on solar power, every mW  of power consumption counts. Tinkerboard seems to draw more power than Rpi an Orange pi. Rpi3+airspy accounts for 630mA at 5V during an active connection. I have also taken additional power saving measures like turning off the on Board leds and the HDMI.

Best Ni
EA5ZL

Re: airspy no audio in SDRSharp #sdrsharp

S C
 

Hi, Alan thanks 

What audio do you lose? all from the computer

From other devices, Windows sounds? yes all sounds

Have you checked if Windows audio properties yes and I see my speakers set to default

Re: #SpectrumSpy #spectrumspy

Silverfox
 

Try osmocom_fft.

73,

Alan – W6ARH

 

 

From: main@airspy.groups.io [mailto:main@airspy.groups.io] On Behalf Of eu@...
Sent: Sunday, March 11, 2018 9:01 AM
To: main@airspy.groups.io
Subject: [airspy] #SpectrumSpy

 

Hello everyone,

Contrary to most people, I look for airspy on a cheap spectrum analyzer.
Unfortunately, this has clearly not been the main feature of airspy. The "Spectrum Spy" application is still somewhat poor in terms of functionality.


Thus, I would like to leave here a short wish list for the application "Specrum Spy":
 - Configurable span, from 100kHz to full BW, using fully custom values.
 - Configurable RBW (1Hz to 1MHz)
 - Windowing (Hamming, Hanning, Rect, etc..)
 - Peak tracking/detection
 - Cursors


Best regards,
Renato Costa

#SpectrumSpy #spectrumspy

eu@...
 

Hello everyone,

Contrary to most people, I look for airspy on a cheap spectrum analyzer.
Unfortunately, this has clearly not been the main feature of airspy. The "Spectrum Spy" application is still somewhat poor in terms of functionality.


Thus, I would like to leave here a short wish list for the application "Specrum Spy":
 - Configurable span, from 100kHz to full BW, using fully custom values.
 - Configurable RBW (1Hz to 1MHz)
 - Windowing (Hamming, Hanning, Rect, etc..)
 - Peak tracking/detection
 - Cursors


Best regards,
Renato Costa

Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

David Ranch
 


Hello EA5ZL,

Thanks for taking the time to write this up and it's quite illuminating to see how poor some of those cables are.  I too have run into cables that LOOK like their quality made with built-in ferrites on both ends, etc. only to find their crap.  I wish we could find a reliable source of "RF tight" cables that both consistently good and aren't outrageously priced.

Anyway.. I look forward to your results on the OrangePi to see if it's any better.  Btw.. why the OrangePi vs. say a Tinkerboard or a Pine64 or other?  There are SO many SBCs out there now but it's impossible to beat the community and support found with the Raspberry Pi boards.

--David
KI6ZHD

Re: Airspyhf+ flashing

Alberto I2PHD
 


Just a small note based on my personal experience. At first, shorting the two "Erase" pads as shown in the photo did not work...
Then I realized that maybe the pads could have been covered by a transparent layer of protective (and insulating...) paint.
I disconnected the unit from the USB port, and gently scraped the top of the two pads so to expose the bare solder.
Then I reconnected the unit to the USB port, and repeat the shorting procedure.
This time everything worked as it should, and was able to correctly flash the firmware.
 
--
73 Alberto I2PHD
Credo Ut Intelligam


USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi

ea5ehs@...
 

Last February I got surprised for the QRM emitted from USB cables at the remote RX site when performing the initial setup of the SDR.

In the remote RX site, I replaced the nice working Red Pitaya SDR (Soft from Pavel Demin) with the Airspy HF3 + Raspberry PI 3B configured as a spyserver.

I soon discovered a really bad noise floor and began checking with my Swiss army tool "Tecsun PL600".
RF emission in VHF/HF from the RPi3, SDR, and cables was unacceptable. The culprit was traced to the USB cable connecting between the Rpi3 and the Airspy HF+. 
Using all the USB cables available on the site and my car, I improvised a USB cable comparison test in HF and VHF whose results can be found attached to this post ( 3.2MB pdf file, I have never published before). 

This is an unscientific test because it was improvised, please don't blame me for any inconsistency in the results. I had to quit testing after 2 hours because I couldn't cope with the cold and windy conditions (QTH is 950m ASL).
Conclusion: Good quality USB cables are a must in RX QTH.

I wish this can be useful and/or inspiration to others.

My best 73 all
from Niceto
EA5ZL

Audio Unity Gain

EB4APL
 

Hello,

Excuse me if this has been explained before but, what is the use for the "Unity Gain" checkbox in the Audio panel?
If I check it the audio gets muted.

TIA,
Ignacio, EB4APL

Re: Airspyhf+ flashing

EB4APL
 

HI,

The COM10 port issue is not definitive. Here one computer uses COM11, other COM13. None of them has anything installed on COM10.
I have noticed that the USB cable has influence in SOME flashing problems.
One problem that I had was due to my main computer not had the system program file "wmic.exe" , which is used by FLASH.bat,  in the right folder. I copied it to its standard location "Windows|System32" and the problem solved. Who knows what did the change.

Regards,
Ignacio, EB4APL

El 11/03/2018 a las 13:15, jdow escribió:
As a last resort temporarily remove all other USB devices that are not keyboards, mice, touchpads, or CDROMs. And based on something awhile back make sure nothing is sitting on COM10 serial port. There was a series of comments that suggested the ASHF+ device will look like a COM port and may try to land on COM10 by preference.

{^_^}

On 20180311 04:49, W8RMV@... wrote:
Mark Taylor,
You are not alone. I had the same message when trying to flash the latest version 1.6.2.  I have flashed the previous versions successfully & on the same computer (W10 64bit) & USB cable.  I took the cable & HF+ & connected it to my W10 64 bit Laptop & it flashed there, no problems.  I still haven't figured out why my desktop stopped cooperating.  I did notice that my virus protection on the Desktop warned me of a deep guard concern, but disabling the complete security suite, did not fix the flash issue.  And that was the first time my Virus protection did that.  All prior flashes did not trigger the protection.  I do not have that protection suite on my laptop.
--
73 Bob W8RMV

Re: Airspyhf+ flashing

jdow
 

As a last resort temporarily remove all other USB devices that are not keyboards, mice, touchpads, or CDROMs. And based on something awhile back make sure nothing is sitting on COM10 serial port. There was a series of comments that suggested the ASHF+ device will look like a COM port and may try to land on COM10 by preference.

{^_^}

On 20180311 04:49, W8RMV@... wrote:
Mark Taylor,
You are not alone. I had the same message when trying to flash the latest version 1.6.2.  I have flashed the previous versions successfully & on the same computer (W10 64bit) & USB cable.  I took the cable & HF+ & connected it to my W10 64 bit Laptop & it flashed there, no problems.  I still haven't figured out why my desktop stopped cooperating.  I did notice that my virus protection on the Desktop warned me of a deep guard concern, but disabling the complete security suite, did not fix the flash issue.  And that was the first time my Virus protection did that.  All prior flashes did not trigger the protection.  I do not have that protection suite on my laptop.
--
73 Bob W8RMV