On Apr 15, 3:07 pm, Walter Maxwell wrote:
On 15 Apr 2007 14:33:40 -0700, "Jim Kelley" wrote:





On Apr 15, 6:53 am, Walter Maxwell wrote:
On Sun, 15 Apr 2007 19:23:56 +1000, Alan Peake
It is interesting to look at a single short pulse propagating along the
TL. At the stub point, the pulse must encounter a discontinuity in
impedance and therefore there will be a reflection. This can been seen
on a TDR. So there is a real reflection from a stub regardless of
whether or not it is a virtual short.
Alan
VK2ADB

I thank you for that, Alan, because, to continue, when the pulse is replaced with a sine wave, there is also a
reflection from the stub.

Hi Walt -

Begging your pardon, but don't TDR's examine the transient response of
a system, rather the steady state response?

ac6xg

You're correct, of course, Jim, but I was intuitively assuming we'd not be continuing the use of the TDR with
the sine wave signal. I'm sure my intuition wasn't communiated, sorry.

Walt- Hide quoted text -

- Show quoted text -

I guess I may have been 'intuiting' too much, myself. Since virtual
shorts and opens only appear in the steady state, I wouldn't expect
pulses to reflect off of them. I don't expect sine waves to reflect
off of them in steady state either for that matter, but that remains a
point of contention apparently.

73, Jim AC6XG