Re: #QCX 4174 Ready for practice test #qcx


DL8LRZ
 

The practice test was negative. My mistake: My tuner tunes to antenna voltage, no control of adaptation to the PA. This caused the PA to overload, causing the MPS2907 to burn. Repair ok. Change tuner is in progress.
I use follow regulator https://www.ebay.de/itm/Mini-DC-DC-4V-12-24V-To-5V-3A-Adjustable-Step-Down-Power-Module-Buck-Converter/272694825804
In my overvoltage-protection the 0,47ยต - C is reduced to 10nF
There is a unknown problem on my QCX: Full QSK works fine, Semi QSK not -
no intermission between the characters (version 1.00e)
73 DL8LRZ

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