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Topic: [solved]Strange bias adjustment (Read 4106 times)
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #15 on: 26. August 2018, 22:05:14 »
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OK, yes, the PA bias value goes to Zero after a reset, but the individual power out settings go to strange values, see 1st pic! (sorry, blurry)
Measuring the Pin 4 of U18, when PA bias is at Zero, the pin 4 voltage is 2.93 see pic w2
When Pa Bias setting is 104, the pin 4 voltage is .25 see pic 3
This is working backwards.
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| « Last Edit: 26. August 2018, 22:07:03 by WD8BXS » |
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Thanks,
De WD8BXS vy 73
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #16 on: 26. August 2018, 22:06:38 »
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pic 1
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Thanks,
De WD8BXS vy 73
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #17 on: 26. August 2018, 22:07:23 »
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pic2
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De WD8BXS vy 73
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WD8BXS
alter Hase
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Re:Strange bias adjustment
« Reply #18 on: 26. August 2018, 22:07:42 »
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pic3
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De WD8BXS vy 73
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WD8BXS
alter Hase
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Re:Strange bias adjustment
« Reply #19 on: 26. August 2018, 23:00:04 »
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Just discovered that with another "U" board, the bias is working.
Maybe bad MCU????
Anyway to do a hard reset on MCU?
I tried reloading bootloader and firmware, maybe I need to do it again.
73,
CHuck
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De WD8BXS vy 73
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DF5LI
alter Hase
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Posts: 371
Ich liebe meinen SParrow !
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Re:Strange bias adjustment
« Reply #21 on: 27. August 2018, 09:58:32 »
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Ich habe gerade mal am Pin 4 (Out) und Pin 1 (from DAC) von U18 nachgemessen (ohne PA-Transistoren) :
Pin 4 Pin 1
Bei Bias = 0 -> 1,35 Volt -> 0,32 Volt
bei Bias = 115 -> 4,39 Volt ->3,18 Volt
Über die Default-Werte bei den Power-Einstellungen nach einem Full Reset habe ich mich auch schon gewundert. Waren die nicht mal alle auf 0 bzw auf 3 ?
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73, Harri
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DB4PLE
positron
Urgestein
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Posts: 1278
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Re:Strange bias adjustment
« Reply #22 on: 27. August 2018, 12:43:11 »
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Hi Chuck,
the images put me hopefully on the right track. The default values for the PA configuration during reset where at some point defined per Band and not identical to the default which is used when you press the "default" button in menu (here it is always 3).
I just did a pull request to set all defaults when doing the configuration reset to 0. This is very safe and should do what is expected from a full reset.
73
Danilo
OK, yes, the PA bias value goes to Zero after a reset, but the individual power out settings go to strange values, see 1st pic! (sorry, blurry)
Measuring the Pin 4 of U18, when PA bias is at Zero, the pin 4 voltage is 2.93 see pic w2
When Pa Bias setting is 104, the pin 4 voltage is .25 see pic 3
This is working backwards.
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #23 on: 27. August 2018, 13:22:46 »
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Yes, this will be good!
Still confused though why my MCU is working backwards from the DAC
73,
Chuck
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De WD8BXS vy 73
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #24 on: 27. August 2018, 13:46:59 »
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Is there a command with the uhsdr_tool to reset the MCU ??
Chuck
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De WD8BXS vy 73
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DB4PLE
positron
Urgestein
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Posts: 1278
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Re:Strange bias adjustment
« Reply #25 on: 27. August 2018, 13:48:19 »
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Hi Chuck,
Yes, this will be good!
Still confused though why my MCU is working backwards from the DAC
73,
Chuck
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Me too, I am also confused by this. I checked the code and there is no difference to any other setting handling. BTW, is there the same problem when changing CW PA Bias or not?
73
Danilo
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DB4PLE
positron
Urgestein
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Re:Strange bias adjustment
« Reply #26 on: 27. August 2018, 13:50:03 »
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Is there a command with the uhsdr_tool to reset the MCU ??
Chuck
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No. And even if it would exist, we would most likely call the same internal function as we do when pressing F1-F3-F5.
73
Danilo
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #27 on: 27. August 2018, 14:45:10 »
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Well, I finally gave up and replaced the MCU!
That fixed it!!!!
WOW, bad MCU!!!!
de Chuck
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De WD8BXS vy 73
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WD8BXS
alter Hase
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Posts: 286
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Re:Strange bias adjustment
« Reply #28 on: 27. August 2018, 14:48:48 »
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Andreas, believe it hihi!
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De WD8BXS vy 73
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