Re: QMX+ V2 - I've killed it
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Here's a case of a QMX+ with current firmware having D109 fail:
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I doubt it was the speaker and key connector board shorting to the case,
don't see how that would bring down D109.
So probably a matter of him jiggling the power connector.
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It may be a rare occurrence.
Perhaps most of the other reports of D109 failing were with older firmware.
But many users will hesitate before moving a rig that is powered on.
In an attempt to understand any problem quantitatively rather than qualitatively or subjectively... I did a search of the forum posts for all instances of "D109" going back 12 months. There were 51 messages that mention D109, out of a total of approximately 20,000 messages. Which means that 0.25% of messages mention D109 somewhere in their?text.?
In examining?these 51 messages I found only two cases where the D109 failure was thought to have been caused by wiggling a supply connector intermittently. NO cases where D109 was blown by a step voltage from 5V to 12V (or other similar). Even in these two cases, the intermittent supply wasn't definitively the issue, it was postulated as the likely issue. As I mentioned, I have never seen issues with intermittent or sudden drop out of supply but, nevertheless, of course I think it's better to avoid these scenarios if possible.?
Perhaps we should get it in perspective??
I personally have THREE times spilt something into my radio, which is only ME. Including a cup of Turkish coffee which was knocked over during my SMPS investigation? and which the QMX survived. And at the Friedrichshafen hamfest this year, with poor Hannes DL9SCO's QMX+ as my demo QMX+ on the table, I spilled Fanta into it - and it did NOT survive (failure mode is currently still pending investigation).?
Yeah so dumb Hans should be less clumsy. Yet, we are not all talking about how QMX/QMX+ should be made waterproof...
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