Date   

Re: Airspy Mini calibrate #hardware

jdow
 

There is a suggestion on the web that the pilot carriers for US DTV are worth using. I tuned one earlier to day on a GPS stabilized AirSpy R1 and figure they are good for 1ppm level, at least. I am not sure what the digits beyond the XXX.310 MHz should be I saw about 400 Hz low. But that may be that the correct frequency really is slightly below XXX.310 MHz. At the very least it is more accurate than most cheap handheld equipment.

{^_^}

On 2017-11-21 12:32, prog wrote:
[Edited Message Follows]
On Tue, Nov 21, 2017 at 05:47 am, Dave C aka Dave3825us wrote:
It was 462.something. I used a cobra walkie talkie . Tried from 5 feet away
to 1 foot away. Get like 3.xx something ppm, then -1.04 ppm and after 4 or 5
tries its now at 0.06. Do you really believe a cobra walkie talkie is a good source for stable carrier? The signal is **frequency** modulated in function of your ambient audio. ie. completely random. Plus even without modulation, these talkies have worse frequency accuracy and stability than the Airspies.
I suggest you send it to Joe at airspy.us for proper calibration.


Re: Direct Sampling frequency limit in r 1628 onwards #sdrsharp #spyserver

jdow
 

The guts of the dongles don't really allow tuning higher than 14.4 MHz. For that matter 14.4 MHz may be rather pushing the RTL chip, the one which performs IF filtering and A/D conversion.

{^_^}

On 2017-11-21 10:05, Martin via Groups.Io wrote:
[Edited Message Follows]
Hi,
I see that in the release notes for r 11628 onward that "Set RTL max frequency to 14.4 MHz in direct sampling mode." has been added.
Is there any particular reason for this ?
I understand the desire use the tuner chip as much as possible in order to avoid Nyquist Alias signals and to have RF gain control. But I have an application where I wish to continue using direct sampling above 14.4MHz and this change has caused problems for me.
Could I suggest that it may be better if the user / admin could set this as required, as some configurations may need to use direct sampling above 14.4MHz and others may not.
It would be even better if it was possible to define frequency limits for direct / quadrature sampling in SDR Sharp and Spyserver, so that this could change automatically when the defined frequency boundary is crossed. This would save having to reconfigure things manually for example when you wish to move from HF to VHF and allow a mix of HF / VHF / UHF frequencies to be scanned.
It may also be possible to extend this proposed configuration option to automatically turn spyserver on-off (along with the frequency off-set) or turn the bias tee on / off (if folks are using this to switch antennas or pre-amps in / out).
Regards,
Martin - G8JNJ


Re: Shipping dates - any updates/confirmations? #airspyhfplus

Mike Jackson
 

I think Joerg meant confirmation of shipping, I too received the confirmation of the order, that would be standard procedure when parting with pocket money.


moderated Re: EXTIO File for HF+ ?

prog
 

On Tue, Nov 21, 2017 at 03:03 pm, <dx@...> wrote:
Great! Thanks for the information. Is Andrea's EXTIO available in the final, DLL format? I'm not a software geek to know for sure, but it looks to me like his web site only links to the source data and the EXTIO needs compiling by the end user. Sorry if I'm using the wrong terminology... I just want to be able to download a finished DLL file to place in my software folders.

Like Patrick, I'm also a serious MW DXer. Studio 1 has some serious features of interest to me such as its first-rate synchronous AM detector and waterfall resolution for weak carrier detection. Unfortunately the oft-promised WAV file recording scheduler for Studio 1 never materialized, so I use HDSDR for unattended recording and use Studio 1 for the actual DXing of the recorded files.

I'll be very happy to give SDR# a try for MW DXing once my HF+ receivers arrive, especially if there's IQ WAV file scheduling available.

73, Guy
We implemented our own equivalent of "synchronous AM" with a "Lock Carrier" feature that can be combined with any other mode. It is much less prone to lose lock in weak signals and can be combined with the Anti-fading. The AGC and noise reduction are also optimized to exploit the processing done in these stages.
Some advanced SWLs like London Shortwave use this combination as the main setup for archiving the SW band at the highest fidelity for their project.



moderated Re: EXTIO File for HF+ ?

Guy Atkins
 

Great! Thanks for the information. Is Andrea's EXTIO available in the final, DLL format? I'm not a software geek to know for sure, but it looks to me like his web site only links to the source data and the EXTIO needs compiling by the end user. Sorry if I'm using the wrong terminology... I just want to be able to download a finished DLL file to place in my software folders.

Like Patrick, I'm also a serious MW DXer. Studio 1 has some serious features of interest to me such as its first-rate synchronous AM detector and waterfall resolution for weak carrier detection. Unfortunately the oft-promised WAV file recording scheduler for Studio 1 never materialized, so I use HDSDR for unattended recording and use Studio 1 for the actual DXing of the recorded files.

I'll be very happy to give SDR# a try for MW DXing once my HF+ receivers arrive, especially if there's IQ WAV file scheduling available.

73, Guy


Re: CPU load on single board Linux computers with 12 bit SDR? #hardware #spyserver

prog
 

On Tue, Nov 21, 2017 at 02:47 pm, Jeff Kelly wrote:
sdr://k2sdr.dyndns.org:5555 is on 8 mhz now.
 
Jeff
Works just fine.


Re: CPU load on single board Linux computers with 12 bit SDR? #hardware #spyserver

Jeff Kelly
 

sdr://k2sdr.dyndns.org:5555 is on 8 mhz now.

Jeff



On Nov 21, 2017, at 5:40 PM, Jeff Kelly <jkelly@...> wrote:

Hmmm - gonna try the 8 mhz for a little while!  :-)


On Nov 21, 2017, at 5:23 PM, Marcus D. Leech <mleech@...> wrote:

On 11/21/2017 05:21 PM, prog wrote:
On Tue, Nov 21, 2017 at 02:06 pm, Jeff Kelly wrote:
It does burp a little with the 8 mhz bandwidth of the airspy. so wouldn’t recommend that.
The Odroid XU4 has a slight edge on this use case.




Re: CPU load on single board Linux computers with 12 bit SDR? #hardware #spyserver

Jeff Kelly
 

Hmmm - gonna try the 8 mhz for a little while!  :-)


On Nov 21, 2017, at 5:23 PM, Marcus D. Leech <mleech@...> wrote:

On 11/21/2017 05:21 PM, prog wrote:
On Tue, Nov 21, 2017 at 02:06 pm, Jeff Kelly wrote:
It does burp a little with the 8 mhz bandwidth of the airspy. so wouldn’t recommend that.
The Odroid XU4 has a slight edge on this use case.



moderated Re: EXTIO File for HF+ ?

Patrick
 

Sorry, I'm obviously too stupid to make an assessment here.




2017-11-21 23:16 GMT+01:00 prog <info@...>:

On Tue, Nov 21, 2017 at 02:12 pm, Patrick wrote:
I simply wish the combo SDR# HF+ is so great that I won't need other soft for these purposes.
 
Best regards
Patrick
Well. Make it great then! Learn how to use the plethora of plugins available to you - starting from the Aux VFO.
But of course, as long as you are unable to see DSP flaws in software, your perception of "great" will be flawed as well.
Unfortunately, we cannot spend time on producing quality DSP and educate everybody at the same time.



Re: Direct Sampling frequency limit in r 1628 onwards #sdrsharp #spyserver

Martin - G8JNJ
 
Edited

Hi,

Unfortunately, although I'm also keen on technical correctness, it can stifle experimentation, innovation and perhaps even joy :-)

Regards,

Martin - G8JNJ


Re: CPU load on single board Linux computers with 12 bit SDR? #hardware #spyserver

Marcus D. Leech <mleech@...>
 

On 11/21/2017 05:21 PM, prog wrote:
On Tue, Nov 21, 2017 at 02:06 pm, Jeff Kelly wrote:
It does burp a little with the 8 mhz bandwidth of the airspy. so wouldn’t recommend that.
The Odroid XU4 has a slight edge on this use case.


Re: CPU load on single board Linux computers with 12 bit SDR? #hardware #spyserver

prog
 

On Tue, Nov 21, 2017 at 02:06 pm, Jeff Kelly wrote:
It does burp a little with the 8 mhz bandwidth of the airspy. so wouldn’t recommend that.
The Odroid XU4 has a slight edge on this use case.


moderated Re: EXTIO File for HF+ ?

prog
 

On Tue, Nov 21, 2017 at 02:12 pm, Patrick wrote:
I simply wish the combo SDR# HF+ is so great that I won't need other soft for these purposes.
 
Best regards
Patrick
Well. Make it great then! Learn how to use the plethora of plugins available to you - starting from the Aux VFO.
But of course, as long as you are unable to see DSP flaws in software, your perception of "great" will be flawed as well.
Unfortunately, we cannot spend time on producing quality DSP and educate everybody at the same time.


moderated Re: EXTIO File for HF+ ?

Patrick
 

I simply wish the combo SDR# HF+ is so great that I won't need other soft for these purposes.

Best regards
Patrick

2017-11-21 23:06 GMT+01:00 prog <info@...>:

On Tue, Nov 21, 2017 at 02:05 pm, Patrick wrote:
As a hardcore NDB & MW DXer, I also hope to use my HF+ with Studio 1 because of its very sharp CW filters and superior waterfall readability.
I made some tests using SDR# 1626 on the NDB band (where several beacons can be found within a few Hz) and found it quite poor. For MW carrier monitoring, I also found resolution disappointing (recorded files were used)
 
Will HF+ and SDR# allow to clearly see several carriers within 10 Hz and separate a couple of beacons within  a few Hz too ? I hope so !
 
Patrick
If you don't mind aliases (ie. signals that aren't there) you can use whatever software you wish.



moderated Re: EXTIO File for HF+ ?

prog
 

On Tue, Nov 21, 2017 at 02:05 pm, Patrick wrote:
As a hardcore NDB & MW DXer, I also hope to use my HF+ with Studio 1 because of its very sharp CW filters and superior waterfall readability.
I made some tests using SDR# 1626 on the NDB band (where several beacons can be found within a few Hz) and found it quite poor. For MW carrier monitoring, I also found resolution disappointing (recorded files were used)
 
Will HF+ and SDR# allow to clearly see several carriers within 10 Hz and separate a couple of beacons within  a few Hz too ? I hope so !
 
Patrick
If you don't mind aliases (ie. signals that aren't there) you can use whatever software you wish.


Re: CPU load on single board Linux computers with 12 bit SDR? #hardware #spyserver

Jeff Kelly
 

I am running the Asus Tinker board…one with an Airspy and one with a RTLSDR V3
It handles the 2.5 MHZ Airspy bandwidth and the 2.4 RTLSDR fine.  And I think 10 users would be fine.

It does burp a little with the 8 mhz bandwidth of the airspy. so wouldn’t recommend that.

I have 4 tinker boards stacked for projects and have pretty much put the RPI’s in the drawer! Love them.

Tinkers...




Jeff
K2SDR





On Nov 21, 2017, at 4:33 PM, weird_joe@... wrote:

Hi Everybody,

I have a few questions on the real life situation with mini computers and the Spyserver.
- I'd like to know how the CPU load of e.g. a Raspberry Pi 3 is when running the Spyserver with a device like the Airspy or Airspy Mini (more than 8 bits)?
- Do I have to reduce the FFT framerate in order to not overload the CPU? 
- What bandwidth can I practically use? Full spectrum? (full 10MHz on an Airspy?) I am really impressed how low the CPU impact on a second connected client is when running it under Windows. 
- Would you recommend a more powerful mini computer, like the Asus Tinker or Odroid octa core with twice as much RAM and much more performance?
- I believe the Asus Tinker has the exact same physical outlines of the Pi3, and there are plenty of inexpensive metal cases that should minimize the RF noise - so I guess that would be an advantage against the Odroid boards which are available with the faster memory modules than the fastest SD cards as far as I have been reading. Any recommendations on that?
- Do you have any recommendations on where to get a low RF-noise 5V 4A power supply for these more powerful boards?
- in case performance on these boards is no big issue, can I also run several Spyserver in separate directories addressing different receivers in parallel in Linux like I currently do on my Windows server?
- I have just been trying to run the Spyserver on my little Raspberry-Pi Zero W with the latest OS (slim version w/o GUI) but the only thing I get a a segmentation fault. The relatively dumb RTL-TCP server runs fine, so the dongle and driver setup works. So far I could not find out what the actual problem is. I have already been reformatting the SD card and put the latest image on.

In advance many thanks for any constructive feedback!


moderated Re: EXTIO File for HF+ ?

Patrick
 

As a hardcore NDB & MW DXer, I also hope to use my HF+ with Studio 1 because of its very sharp CW filters and superior waterfall readability.
I made some tests using SDR# 1626 on the NDB band (where several beacons can be found within a few Hz) and found it quite poor. For MW carrier monitoring, I also found resolution disappointing (recorded files were used)

Will HF+ and SDR# allow to clearly see several carriers within 10 Hz and separate a couple of beacons within  a few Hz too ? I hope so !

Patrick


Re: Direct Sampling frequency limit in r 1628 onwards #sdrsharp #spyserver

prog
 

On Tue, Nov 21, 2017 at 02:02 pm, Martin wrote:
OK, it's your call, and I understand why you may wish to do it for both technical and commercial reasons.
Nope. Correctness first. We don't have an s-meter for the same reason. We have an SNR-Meter.


Re: Direct Sampling frequency limit in r 1628 onwards #sdrsharp #spyserver

Martin - G8JNJ
 

Hi,

OK, it's your call, and I understand why you may wish to do it for both technical and commercial reasons.

As I said previously, there is a Nyquist Alias wrapped around 14.4MHz, but adding this restriction alone still won't completely stop alias signals from above this frequency appearing at lower frequencies. RTL dongles used in this way will always be a compromise, so I've never considered this particular issue to ever be a major problem. Especially as there are other sampling aliases present depending upon the sampling rate chosen in SDR Sharp (and others).

RTL dongles are never going to compete with hardware like Airspy's or HF+'s. But they do provide a good introduction to SDR's and facilitate a lot of experimentation and other applications that may otherwise be too costly to implement by casual or 'hobby' users.

I often use a diplexing filter to minimise this problem when running RTL dongles in direct sampling mode with SDR Sharp (and others), so my plan was to use three dongles connected by a triplexer to cover 0-14.4 / 14.4-28.8 / 28.8 and above.

The suggestion was intended to try and maintain the same functionality of SDR Sharp in both normal and Spyserver mode  wherever possible.

Personally I'd appreciate it if you didn't put this restriction in, but as I said before it's your call.

Regards,

Martin - G8JNJ


Re: Shipping dates - any updates/confirmations? #airspyhfplus

Alberto I2PHD
 

On 11/21/2017 4:18 PM, Joerg Bauerfeld wrote:

 

Anyway I guess none of you has received any confirmation from itead.cc on the order as well, apart from the money transfer via paypal?

You guess wrong...  I received the following order confirmation from Itead :



--
73 Alberto I2PHD
Credo Ut Intelligam


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