Re: QMX+ Diagnostics Voltage Measurement Question
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Hi Jim
Don't worry about it. A bit low, borderline, but acceptable. Device component variations... there will hopefully in future be a calibration function which evens out all these variations by measurement.
On Fri, Jul 12, 2024 at 8:08?AM Jim Bennett / K7TXA via <w6jhb= [email protected]> wrote: My QMX+ "seems" to be working OK, although 20-17-15 meter power is a bit lower than I'd hoped - just under three watts.
?Anyway, tonight I fired up PuTTY and was looking at the diagnostics screen and came across results that puzzle me. The QMX manual indicates that under the Transmitter section, the measured PA voltage should be "a little less than the supply voltage measurement." My supply voltage shows 11.8v receive and 11.5v in transmit. However, on ALL bands in the transmitter section the PA voltage shows either 9.6v or 9.7v when I press "T". Further, that measurement sometimes shows in green, but mostly it is either red or alternating between red and green.
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?Anyone know what is happening here? The manual says "red or green depending on whether it is within a reasonable operating range or not."
?Thoughts? Should I be seeing more than 9.6 or 9.7 volts on the PA with a supply voltage of 11.8? If so, a good starting point to debug it?
?OK - just before I was ready to send this message, I connected up my mid-band QMX and ran the same tests. The mid-band radio is showing about 9.8 or 9.9 volts on transmit and in each case it is GREEN. So it appears to me that the QMX+ is giving me a bit less PA voltage than it should. Where to look, OR just boost supply voltage a bit?
?Tnx, Jim
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Jim / K7TXA
Eagle, ID
SKCC 10447T
BUG 301
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