| Hi Barry,
One time I was asked to evaluate this Digital Oscilloscope for
our group. What an opportunity I thought to see what my Bass puts
out for "millivolts", because this 'scope could capture and hold
a transient, then perform an analysis on it.
The thing put out *volts*, depending of course on how hard I
was slapping it! That was into essentially a "no load" condition;
most guitar amps have input loadings that are much less than a 'scopes.
I have a Dimarzio Bass pickup.
The best way to find out, instead of just assuming some number
like "50mV", is to actually measure the instrument. Have your friend
play some hard full bar chord strumming, with everything wide open, while
you take the readings from a 'scope.
Electric guitars are very dynamic instruments, whose voltage
outputs can go from 1 to peaks of several thousand mV! Amplified
pickups, such as on the Aria, can probably do better than that...
The best cordless transmitters use DBX compression, so that their
modulators are not overdriven by this dynamic range. The dynamic
range is then recovered at the reciever with DBX expansion.
As far as a guess, I'd say set your 50% modulation point at
100mV, considering that the Aria pickups are active. 50 mV for
passive pickups.
Good luck!
Joe Jasniewski
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| Thanks Joe,
I didn't realize the output was quite so variable.
With the info you've given I should be able to rig up something
that'll do the job. The problem now appears to be re-producing the
correct levels at the receiver end. Oh well, time to get sizzling
with the soldering iron!
Thanks for the info,
Barry.
|
|
Re .2 - Steve;
Well, that depends on the input impedance of your meter. It
has to be on the same order as your amp's inputs, which are between
1 megohm and 50K ohms, to give a "correct" reading.
I think on some meters this is given in ohms per volt. If it's
50K ohms per volt, and you're measuring 50 mV (0.05V), that's 0.05
times 50,000 or a 2.5K effective loading, which is much much to
low for a guitar. So your reading will be way off.
Like I said in .1, I took the opportunity to use this $50K thing
to measure my bass's output, cause it's a pretty difficult measurement
to make "at home" or whatever. It printed out everything on a cash
register tape as I recall...I still have 'em around somewhere!
Joe
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