On Fri, Dec 27, 2024 at 08:21 AM, Alan G4ZFQ wrote:
I run mine at 7.5 Volts and have series diodes to feed the PA dropping that to around 5 Volts, I Watt output.
I just dusted off my QDX the other day.? I built it from kit a couple of years ago and wired it for 9VDC.? I wanted
to see how low I could get the output by lowering the input voltage (I plan to use it with my HardRock-50+, which
can be driven to full output by about 2 watts, depending on band).
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I found that at 7VDC the QDX ran fine.? At 6VDC, the QDX really wouldn't boot up; the red LED came on solid ...
no blinking ... and nothing seemed to happen.? When I set the input voltage back to 7VDC, the QDX came up in
firmware update mode.? Turned it off and turned it on again and back to normal.
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That 7VDC number is consistent with responses to my question a few weeks ago about lowering the output
on my slowly-getting-built QMX+.
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Alan ... I'd be interested to hear more about "series diodes to feed the PA" ... I might still need to do this.
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Cheers -
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Bruce K1FFX
