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Isn't that ultra-wideband only useful for very short distance communication, like maybe ten metres?

I'm not into CDMA technology so I can't say with confidence that QCOM's technology will be affected - but ultra-wideband has appeared to have spooked a number of QCOM and similar technologies into thinking that ultra-wideband will affect their technologies. It may, or it may not, the point is that it appears to have affected the share price simply because it appears to be a an alternative competing technology.

I see several crossings of the 13-day moving average and the 150-day moving average, at about the same price. For QCOM, there are three crossings between June and September. For RMD, there are three crossings between September and December. Doesn't that strategy lead to lots of false entries and exits?

Yes - it can do but this is where Weinstein's book explains how to set your stops (either actual or mental). You won't get it right all the time but in the main you will. Far better to exit early with even a small profit than exit late and lose it all.

TA will give you a positive guide rather than an actual exit/entry point. Experience and knowledge of individual stocks also helps. One stock may only rise or fall 10% in a trading channel so if it falls 15% that may be a warning sign. Other stocks may rise and fall 30% or more which will also give you a guide. Weinsteins book is excellent if for no other reason that he has a very good method of setting stops.
The reasons I finds charts so valuable is that a stocks behave in a similar way to moving bodies. My memory of the laws of physics is a bit hazy these days but there is a law that states "a moving body will continue to move in the same direction unless an event occurs to change it" (I hope I've got that right - anybody ??). What this says that if a stock is in a downtrend it will continue in a downtrend until some occurs to change it. With Resmed, for example, it is likely to continue on downhill until an event occurs to change it ie a good analysts report or a good annual report.
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