#QCX 4174 Ready for practice test #qcx
DL8LRZ
Hello, Here is my QCX with some personal
adjustments (I
like small personal adjustments):
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Bill/W2WZ
Looks very nice! Everything in one box.
Which switching regulator did you use? I'm about 2/3 of the way through building mine and was considering using this one: https://power.murata.com/data/power/oki-78sr.pdf It's supposed to fit in a 7805 foot print. It should save significant power when running at higher voltages. I did have some noise concerns, however. I guess the best thing to do is try it both with the 7805 and the Murata switcher and see if I can find any issues. -Bill W2WZ
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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 0,47µ - 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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DL8LRZ
The tuner has been changed, tuning display by the passive bridge circuit with LED works well.
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