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Topic: PA calibration problem (Read 3106 times)
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f5ugq
Neuling
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Posts: 13
 
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Re:PA calibration problem
« Reply #2 on: 04. April 2019, 18:57:18 »
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Hi Artur,
Thank's for your reply and after verification I've got the .... bad ones  . I didn't known that there were somes. I will order the good ones.
73's, Stéphane, F5UGQ
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| « Last Edit: 04. April 2019, 19:01:25 by f5ugq » |
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f5ugq
Neuling
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Posts: 13
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Re:PA calibration problem
« Reply #4 on: 06. April 2019, 09:36:19 »
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H Peter,
I ordered them yesterday at Box 73  .
73's, Stéphane, F5UGQ.
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f5ugq
Neuling
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Posts: 13
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Re:PA calibration problem
« Reply #5 on: 20. May 2019, 18:13:35 »
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Hi all,
I received the new transistors, from Box 73, and solded them on the RF board but I have still a problem in the PA calibration. I've got 560mA with a 13.8V supply and when I proceed to the calibration phase, I'm using the CW paddle for TX, the current don't move, it's still 560mA. I added 3k3 resistor between pin 1 and 4 of the U18, like mentionned in section FAQ PA Bias of the link https://github.com/df8oe/UHSDR/wiki/Adjustment-and-Configuration-Manual#pa-power-calibration, but same result, I don't try the 2k2 resistor yet.
Is somebody have an idea ??
73's, Stéphane, F5UGQ.
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f5ugq
Neuling
Offline
Posts: 13
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Re:PA calibration problem
« Reply #7 on: 26. May 2019, 09:32:46 »
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Hi Andreas,
Thank you for yours explanations. I changed the CW paddle by the microphone, I had to find one because I din't have one. The gate voltage increase well when I increase the PA Bias value but not the current, and there is no output power. I think there is again a problem with the transistors.
I continue the investigations.
73's, Stéphane, F5UGQ.
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