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jawod wrote:
Being relatively new to ham radio, I am considering some form of oscilloscope. I am intrigued by PC-based systems (eg., BitScope Pocket Analyzer) I've read a few NG posts about used HP scopes and a few negative remarks about PC scopes. My question: Given my neophyte status and the likelihood that I would use a scope for anything more the basic / with learning, moderate/ complexity, ... is the PC-based scope a good choice for me? Cost is under $400, not incl. a $40 analog probe. You don't say what you want to measure with a scope, and it is very important with a digital storage scope. Nyquist's theorem says that if you are sampling at 2x the highest frequency present, you can determine that frequency. My experience with digital storage scopes is that you want at least 5x the sample rate and 10x is better to look at a waveform. As a result, a 20 MSample/sec scope is useful up to 2 - 4MHz of input bandwidth. Beware, some of the digital storage scopes specify a "repetitive sweep" bandwidth that is equal to the Nyquist rate. If you are looking at a repetitive signal, you actually can approach this rate. If you are looking at a one-time or rare event, the usable bandwidth is much lower. Exceeding the bandwidth of an analog scope gives you a distorted view of the amplitude and possibly the waveshape. Exceeding the Nyquist rate on a digital scope becomes outright deceptive in amplitude, waveshape and frequency. Unless you need a DSO, I would suggest you look for a good used analog scope. Tektronix made some really nice analog scopes and the 465 is one of the best. HP's analog scopes were always a disappointment to me, but their digital scopes are first rate. As a solid scope, for learning and genearal utility, analog scopes offer a lot more bang for the buck. Good Luck, Bob |
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