We know it¡¯s a high rate because we can compare to ?the groups on other radios. ?I have many rigs and many portable rigs. ?Have a look at the groups for the 817,705,905. ? I haven¡¯t seen many reports of audio chip blowout there and those rigs have sold many more copies (at least 817/705 have) than the lab599. ?
So the audio chip failure rate here on the lab599 is much higher than other rigs. ? Not good on a rig that is supposed to be tough. ?
The question we need to ask is not exactly what the failure rate is, but what is it about the design that makes it much more likely to fail than other rigs and how we can correct it.?
I suspect it may have to do with the audio chip being a bridge setup. ?In a bridge setup neither audio line can be grounded. ?If the audio chip was not a bridge setup then one of the audio lines could be grounded and perhaps that would help the chip against being burned out by stray RF during antenna tuning or during times when the rig is operated close to the antenna as one does when operating portable. ?
It is interesting that every blowout I have read about has happened during tx, and not rx¡ªso this is likely not a problem with how the chip amplifies sound but is more likely a problem with how the chip is grounded (or not effectively grounded as the case may be) in my opinion. ?These folks all seem to report audio ok, then tx, then audio dead. ?
Sent by phone, please forgive my brevity and poor typing.
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On Jan 8, 2024, at 7:58?AM, §¡§ß§Õ§â§Ö§Û §¥§Ö§ß§Ú§ã§ð§Ü <lilo.chita@...> wrote:
?On Sun, Jan 7, 2024 at 04:55 AM, Larry Naumann wrote:
pretty high failure rate
How much in % ?
