[Elecraft] OT USB Scope Question

[knology wb4jfi]

Hey Jim,
One thing to remember with any digital scope is that you need to watch out 
for digital sampling artifacts such as aliasing of signals in question. 
There was a ham I knew that kept complaining that his AD9850 DDS module was 
operating on two different frequencies, sometimes at one frequency and 
sometimes at the other.  I could not convince him that this was a result of 
aliasing WITHIN THE SCOPE itself.  He bought additional DDS modules, 
surprise!  They did exactly the same thing.  Then, he bought an old analog 
scope and no longer saw these problems.

I do have and use a USB scope "in the field", but I am careful to understand 
what that scope is telling me.  I also have a couple of analog scopes, one 
on the bench, and one portable.  I can verify questionable results with 
them.
73, Terry, N4TLF


-----Original Message----- 
From: James Bennett
Sent: Tuesday, September 29, 2015 5:31 PM
To: Elecraft Reflector Reflector
Subject: [Elecraft] OT USB Scope Question

A bit off-thread, but sort of related - wondering if folks on this reflector 
have any experience with USB oscilloscopes. I'm considering adding an 
o'scope to my test bench, and came across an Australian company called 
Bitscope.com. They have several models and appear quite affordable. The nice 
thing is they work on Windows, Linux, Mac OSX, and Raspberry Pi.

I'm a bit limited not only on funds, but room for additional equipment, so 
one of those big analog models is out of the question.

Anyone using a Bitscope unit or any other USB scope here on this reflector?

Jim Bennett / W6JHB
Folsom, CA
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