Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx> Hi Terry and dest,An additional question is why is the 100K (Terry's 220K) in series with the added streamer capacitance and not in parallel?? It seems like two affects are happening. One is a frequency reduction and the other is a Q spoiling effect. Attaching an added capacitor to ground will effect the frequency reduction and adding a resistance to ground will spoil the Q.
In a "real" streamer, is it not the case that the streamer channel is relatively low resistance so the streamer capacitance shows up as additional capacitance to ground for the topload?? And is it not the case that most of the power being dissapated in the streamer is at the streamer tip where the streamer is "burning" a new path??
If the Q spoiling was constant with streamer length, then R in parallel with C may be the right topology. If the Q spoiling was a function of streamer length, then maybe having R is series with C would be the right topology.
Gerry R.
Original poster: dest <dest@xxxxxxxxxxx> Hallo Terry, it looks like you are not receiving some messages too, so i repeat one of them : ) > > Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx> > But "right now", there is the model of "1pF/foot+220K" and the > dynamic (the "first" dynamic) model, at least for coiler's... > I am sort of amazed at how long and successful "1pF/foot+220K" lasted > and still rules today (five years...)!!! how about this: http://www.scopeboy.com/tesla/experiment/index.html "Using Terry Fritz's idea of a fixed resistance in series with (X pF per foot) I get 100k + (2.7pF/foot) which is not really anything like Terry's 220k + (1pF/foot). Are my calculations wrong? Is Terry's model wrong? Or are Scottish streamers just thicker and hairier?" who is rules today - Dr. Mc Steve or Terry? : ) and what was the real reason for 100k & 2.7pico? ----- Let the bass kick! =:-D