John Doty wrote:
On Aug 7, 2006, at 4:39 PM, Dan McMahill wrote:
al davis wrote:
On Monday 07 August 2006 10:01, Dan McMahill wrote:
the manual I looked at said that you specify L/C in H/m and
F/m for the ltra model. You seem to have specified it in
terms of per foot. So this is one prob
On Aug 7, 2006, at 4:39 PM, Dan McMahill wrote:
al davis wrote:
On Monday 07 August 2006 10:01, Dan McMahill wrote:
the manual I looked at said that you specify L/C in H/m and
F/m for the ltra model. You seem to have specified it in
terms of per foot. So this is one problem.
That doesn't ma
The spice3f5 help panel on lossy transmission lines states:
3.3.3. Lossy Transmission Line Model (LTRA)
The uniform RLC/RC/LC/RG transmission line model (re-
ferred to as the LTRA model henceforth) models a uniform
constant-parameter distributed transmission line. The RC
and
al davis wrote:
On Monday 07 August 2006 10:01, Dan McMahill wrote:
the manual I looked at said that you specify L/C in H/m and
F/m for the ltra model. You seem to have specified it in
terms of per foot. So this is one problem.
That doesn't matter if you are consistent. What matters is
t
On Aug 7, 2006, at 2:16 PM, User Tomdean wrote:
.model rg_8u LTRA (len=3.2808399 l=.065uh c=24.8pf r=2.3))
2.3 ohms/foot? Nope...
The losses do not agree with the mfg datasheet.
A problem with the LTRA model here is that it doesn't account for
skin depth. The ohmic loss should be freque
Thanks for the replies.
I have not looked into this type analysis for some 20 years. I still
have my Terman reference!
The value/unit is specified in the Spice 3f5 help pages.
I used the value/foot specifications for Belden 9914 Coax and
specified the length in feet. I added the center conduct
On Monday 07 August 2006 10:01, Dan McMahill wrote:
> the manual I looked at said that you specify L/C in H/m and
> F/m for the ltra model. You seem to have specified it in
> terms of per foot. So this is one problem.
That doesn't matter if you are consistent. What matters is
total L, total C,
User Tomdean wrote:
I am using Spice 3f5, attempting to model a coax line. I am a nubie
at this. The lossless example uses two lines to model one coax. Do I
need to do this with the ltra model? It does not seem to make a
difference.
I get funny results. I use
ac dec 100 1 1000meg
plot db
> I am using Spice 3f5, attempting to model a coax line. I am a nubie
> at this. The lossless example uses two lines to model one coax. Do I
> need to do this with the ltra model? It does not seem to make a
> difference.
>
> I get funny results. I use
>
> ac dec 100 1 1000meg
> plot db(v(4)/v(
I suspected I did not need two lines to model a normal coax at
reasonable frequencies. Thank you.
Why are my results very different than I see in practice?
Is there a better model?
tomdean
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On Monday 07 August 2006 00:00, User Tomdean wrote:
> I am using Spice 3f5, attempting to model a coax line. I am
> a nubie at this. The lossless example uses two lines to
> model one coax. Do I need to do this with the ltra model?
> It does not seem to make a difference.
It has nothing to do
I am using Spice 3f5, attempting to model a coax line. I am a nubie
at this. The lossless example uses two lines to model one coax. Do I
need to do this with the ltra model? It does not seem to make a
difference.
I get funny results. I use
ac dec 100 1 1000meg
plot db(v(4)/v(2))
I see what
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