I was JUST reading that and about to post that this issue sounds a lot like the symptom describes.? My unit shipped Dec 13, after the whole fiasco in Nov (Oct?) and I assumed it had the fixes.? Well, crap.? Any tests recommended to verify this is indeed the issue?? But it sounds like I may be replacing a fried "IC402 with a new 74CBT3253" as well as installing the?1N4148?
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Symptoms are: lack of audio; running the RF Sweeps etc in the terminal tools shows nonsense low audio values. It is important to note that there are multiple possible reasons for no audio, most issues are attributable to improperly installed toroids, specifically failure to properly remove enamel and ensure a good electrical connection. However if you become certain that you have a loss of audio then this indicates that the parasitic oscillation (on a transmit) has destroyed IC402 and it will need to be replaced with a new 74CBT3253.
This modification is a preventative measure, it prevents the occurrence of destructive parasitic oscillation. If your IC402 is already damaged, the diode won't fix it; you need to replace IC402 AND then install the diode.?
