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New FW release: Corrected rounding error in level calibration

 

New FW released
version v1.0-49

Changes:
- Corrected a rounding error in the level calibration causing up to 1dB level error

Due to a data format change you will lose your configuration information. If you have made any changes you should redoc these after updating.
Both high and low mode level calibration should be re-done using either the built-in calibration source or an external known level signal.
The calibration error off factory should be less then 2dB so after this FW update your levels should be within 2dB without calibration.
 

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Hi Erik

Aha you found it, thank you.

I will test again

Kind regards

Kurt

?

Fra: [email protected] <[email protected]> P? vegne af Erik Kaashoek
Sendt: 4. august 2020 17:57
Til: [email protected]
Emne: [tinysa] New FW release: Corrected rounding error in level calibration

?

New FW released
version v1.0-49

Changes:
- Corrected a rounding error in the level calibration causing up to 1dB level error

Due to a data format change you will lose your configuration information. If you have made any changes you should redoc these after updating.
Both high and low mode level calibration should be re-done using either the built-in calibration source or an external known level signal.
The calibration error off factory should be less then 2dB so after this FW update your levels should be within 2dB without calibration.

 

On Tue, Aug 4, 2020 at 08:57 AM, Erik Kaashoek wrote:
New FW released
version v1.0-49

Changes:
- Corrected a rounding error in the level calibration causing up to 1dB level error

Due to a data format change you will lose your configuration information. If you have made any changes you should redoc these after updating.
Both high and low mode level calibration should be re-done using either the built-in calibration source or an external known level signal.
The calibration error off factory should be less then 2dB so after this FW update your levels should be within 2dB without calibration.
Erik,
? Prior to the version 1.0-49 FW update a level calibration on my v0.3 tinySA would set leveloffset low to '0' which gave me a measurement error of < 1dB across the board measured against an external signal source.? With v1.0-49 a level calibration is now setting leveloffset low to '1.7' and my measurements against an external signal source are off by about that amount.? I have to manually set 'leveloff low 0' to regain my <1dB accuracy.? This using the new correction table.

?The v0.2 beta unit has benefited from the FW update. Level calibration sets 'leveloffset low' to a value of -0.7 which resulted in??a measurement error of < 1dB across the board measured against an external signal source. This using the new correction table.

?FW updates including 'clearconfig 1234' set 'leveloffset low' to 100 and measurements at some frequencies in this uncalibrated state exceeded 2 dB at the limits of the measurement range.? In this case a level calibration is necessary and then possibly some fudging of the leveloffset low value.

?In the end, I used the leveloffset low value the level calibration calculated for my beta unit, but had to manually restore my previous leveoffset low value for the production unit.

- Herb
 

On Tue, Aug 4, 2020 at 05:20 PM, hwalker wrote:
Prior to the version 1.0-49 FW update a level calibration on my v0.3 tinySA would set leveloffset low to '0' which gave me a measurement error of < 1dB across the board measured against an external signal source.? With v1.0-49 a level calibration is now setting leveloffset low to '1.7' and my measurements against an external signal source are off by about that amount.? I have to manually set 'leveloff low 0' to regain my <1dB accuracy.? This using the new correction table.
Herb,
Can you check if the same is happening when you manually calibrate using the 30MHz cal output, center = 30MHz and span=10MHz and then an ACTUAL POWER set to -25?
If that gives a good result can you manually calibrate using? the 30MHz cal output, center = 30MHz and span=60MHz and then an ACTUAL POWER set to -25?
I'm most interested in the difference in calibrating powerlevel using ACTUAL POWER using a span of 10MHz versus a span of 60MHz.
 

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Hi Herb and Erik

I think I can provide hints what Herb is fighting. I have a day fully booked but I have 1 hour free form now and will do my testing and then comment

Kind regards

Kurt

Fra: [email protected] <[email protected]> P? vegne af hwalker
Sendt: 5. august 2020 02:21
Til: [email protected]
Emne: Re: [tinysa] New FW release: Corrected rounding error in level calibration

?

On Tue, Aug 4, 2020 at 08:57 AM, Erik Kaashoek wrote:

New FW released
version v1.0-49

Changes:
- Corrected a rounding error in the level calibration causing up to 1dB level error

Due to a data format change you will lose your configuration information. If you have made any changes you should redoc these after updating.
Both high and low mode level calibration should be re-done using either the built-in calibration source or an external known level signal.
The calibration error off factory should be less then 2dB so after this FW update your levels should be within 2dB without calibration.

Erik,
? Prior to the version 1.0-49 FW update a level calibration on my v0.3 tinySA would set leveloffset low to '0' which gave me a measurement error of < 1dB across the board measured against an external signal source.? With v1.0-49 a level calibration is now setting leveloffset low to '1.7' and my measurements against an external signal source are off by about that amount.? I have to manually set 'leveloff low 0' to regain my <1dB accuracy.? This using the new correction table.

?The v0.2 beta unit has benefited from the FW update. Level calibration sets 'leveloffset low' to a value of -0.7 which resulted in??a measurement error of < 1dB across the board measured against an external signal source. This using the new correction table.

?FW updates including 'clearconfig 1234' set 'leveloffset low' to 100 and measurements at some frequencies in this uncalibrated state exceeded 2 dB at the limits of the measurement range.? In this case a level calibration is necessary and then possibly some fudging of the leveloffset low value.

?In the end, I used the leveloffset low value the level calibration calculated for my beta unit, but had to manually restore my previous leveoffset low value for the production unit.

- Herb

 

On Wed, Aug 5, 2020 at 12:05 AM, Erik Kaashoek wrote:
On Tue, Aug 4, 2020 at 05:20 PM, hwalker wrote:
Prior to the version 1.0-49 FW update a level calibration on my v0.3 tinySA would set leveloffset low to '0' which gave me a measurement error of < 1dB across the board measured against an external signal source.? With v1.0-49 a level calibration is now setting leveloffset low to '1.7' and my measurements against an external signal source are off by about that amount.? I have to manually set 'leveloff low 0' to regain my <1dB accuracy.? This using the new correction table.
Herb,
Can you check if the same is happening when you manually calibrate using the 30MHz cal output, center = 30MHz and span=10MHz and then an ACTUAL POWER set to -25?
If that gives a good result can you manually calibrate using? the 30MHz cal output, center = 30MHz and span=60MHz and then an ACTUAL POWER set to -25?
I'm most interested in the difference in calibrating powerlevel using ACTUAL POWER using a span of 10MHz versus a span of 60MHz.
Erik,
? ?My calibrator signal level (-26.7dBm)?is low by 1.7dB? which explains the leveloffset low issue. If I enter CONFIG->EXPERT CONFIG->ACTUAL POWER: -26.7 ?then my leveloffset low value is '0' as expected.? I did not experience this issue prior to v1.0-49, at least not that I can recall.? I changed inter-connecting cables to verify that my cable was not at fault by 1.7dB.

30MHz@10MHz?Span.? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 30MHz@60MHz?Span.
? ??

In any event, manually entering the actual powered measured at 30MHz, using a 10MHz span, is a satisfactory alternative level calibration procedure -? if the 30MHz calibrator level differs from -25dBm by more than a dB or so.

- Herb

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