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zeeglen
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Re: Like tuning a guitar
zeeglen   7/2/2014 9:04:37 AM
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@Measurement Blues Generally, it's best to reomve and replace one string at a time so the neck only relaxes a little.

Which is one of those little things the teach-yourself-to-play chord books don't tell you, has to be learned through trial and error.

rich.pell
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Re: Like tuning a guitar
rich.pell   7/2/2014 8:33:22 AM
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"Seriously, though, is there a way to make the tuning sequence or guitar design so that it doesn't become an interative process?"

They're working on it:

Peavey Auto-Tune guitar

MeasurementBlues
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Re: Like tuning a guitar
MeasurementBlues   7/2/2014 8:12:04 AM
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@Bill, once the strings are stretched, you can tune them without interaction. that takes a day or two. It also depends on how you play. If you play a blues-style with lots of pulls and bends, the strings will go out of tune more rapidly than if you play a classical style.

Bill_Jaffa
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Re: Like tuning a guitar
Bill_Jaffa   7/2/2014 7:52:34 AM
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Sounds like a guitar needs a chiropractor! Seriously, though, is there a way to make the tuning sequence or guitar design so that it doesn't become an interative process?

MeasurementBlues
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Like tuning a guitar
MeasurementBlues   7/2/2014 7:50:26 AM
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Bill,

What you describe is like tuning a guitar when you put in a new set of strings. When you remove the strings, the neck will relax. As you install new strings and tune them, they pull on the neck, each one adding force so you have to go back and re-tune 2-3 times. Then the strings stretch and you have to tune yet again.

Generally, it's best to reomve and replace one string at a time so the neck only relaxes a little.

zeeglen
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Tweak, then re-tweak
zeeglen   7/1/2014 5:49:40 PM
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Remember bandpass filters such as the IF strips in TV sets and the sweeep generators/scope setup needed to align them?  Even an AA5 AM radio had multiple back-and-forth retweaks to get the oscillator to match the dial markings and the RF front end to track the oscillator.  On a multi-band radio this was a real undertaking.

I once designed a product that had 7 tweaks - per channel.  There were 6 channels on the pcb =  42 tweaks altogether.  Fortunately they were not interactive.  I could tune one up in 20 minutes, the production techs took 2 hours.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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