Date   

Re: Airspy Mini calibrate #hardware

Chris Spacone <cspacone@...>
 

I think the larger takeaway might be at least two fold, and probably many more fold:

1 - Don't mess with something that is working.
2 - Understand the thing you are messing with.

Where 'mess' is replaced with a four letter Anglo-Saxon derivative many of us old Navy guys are familiar with...

-Chris


---- jdow <jdow@earthlink.net> wrote:

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: Can your radio do this?

prog
 

On Wed, Nov 22, 2017 at 05:05 am, <kb3cs@...> wrote:
more like 4.99 USD for a pleasant table wine (can't blame you at all for being the proud HF+ Papa)

from the radio demo video:
https://youtu.be/_L5V4q3YAsc?t=5m19s A Lover's Concerto by The Toys 1965 re-released 1994

J.S. Bach Minuet in G major .. https://youtu.be/on1DDSLdDOo i knew i recognized the tune! :-D

Haha nice one :-)
 


Re: Can your radio do this?

kb3cs
 

more like 4.99 USD for a pleasant table wine (can't blame you at all for being the proud HF+ Papa)

from the radio demo video:
https://youtu.be/_L5V4q3YAsc?t=5m19s A Lover's Concerto by The Toys 1965 re-released 1994

J.S. Bach Minuet in G major .. https://youtu.be/on1DDSLdDOo i knew i recognized the tune! :-D


Re: Airspy Mini calibrate #hardware

jdow
 

Um, lemme see, 1 Hz at 500 MHz is about 2 ppb. That's plenty accurate for most people's calibration needs. I don't think the SDRSharp/AirSpy allow ppt tuning adjustments.

Thanks for saving me the time to look up the exact number. That correlates very nicely with what I was seeing. (And the fan on my motherboard's IO Hub (5520)chip gave up the ghost and the heatsink's plastic mounting tabs melted off. I had to rig up a risky substitute arrangement. SIGH!)

{^_-}

On 2017-11-22 00:46, Airspy US via Groups.Io wrote:
From the lower edge of the channel the standard ATSC pilot is at 309.440559 kHz.
So, if the lower edge of the channel is 500 MHz, the pilot would be at 500.309440559 MHz, and no you cannot tune with that accuracy in any SDR program AFAWK, but even if you tune to 500.309441 MHz you would be within 1 Hz.
Obviously with a specification in the milliHertz class, the accuracy would have to be very tight. This will not yield GPS accuracy, but is the best free source for the general public.
---------
Airspy.US
Your USA source for quality SDR products!
www.Airspy.US
NOTE! This email address is not routinely monitored.
If you have an issue, please contact us at airspy@airspy.us
On 11/22/2017 3:10 AM, jdow wrote:
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.




---
This email has been checked for viruses by AVG.
http://www.avg.com


Re: Airspy Mini calibrate #hardware

Airspy US
 

From the lower edge of the channel the standard ATSC pilot is at 309.440559 kHz.

So, if the lower edge of the channel is 500 MHz, the pilot would be at 500.309440559 MHz, and no you cannot tune with that accuracy in any SDR program AFAWK, but even if you tune to 500.309441 MHz you would be within 1 Hz.

Obviously with a specification in the milliHertz class, the accuracy would have to be very tight. This will not yield GPS accuracy, but is the best free source for the general public.

---------
Airspy.US
Your USA source for quality SDR products!
www.Airspy.US

NOTE! This email address is not routinely monitored.
If you have an issue, please contact us at airspy@airspy.us

On 11/22/2017 3:10 AM, jdow wrote:
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.



---
This email has been checked for viruses by AVG.
http://www.avg.com


moderated Re: EXTIO File for HF+ ?

Patrick
 

Hi there !

<< Learn how to use the plethora of plugins available to you - starting from the Aux VFO. >>
What is the point of using the 'Aux VFO' plugin for that specific purpose ???
If you think MW Carrier Monitoring is about monitoring several frequencies running multiples VFOs, you are wrong ... 

(to MW fans : any advice on how to properly use SDR# for serious MW offsets survey is welcome)

Have a nice day, and keep on the good work :-)


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.


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