the bends
 

hi


just wondering how much and how to calculate the loss in some common
coax for ex lmr400 over a given bend

naturally i mean not to exceed it's bend radius spec

but i figure electrons want to stay in motion and 'prefer' to go
straight so if i make a bend some of that energy i recon will be lost


a 90 degree bend is within spec for the above and i wonder how much i
loose

i know some of my variables lmr400 90bend and for ex 20m and 70cm



thanks

the bends
 

the only effect you will notice is if the bend is tight enough to move the
conductors enough to change the characteristic impedance. electrons are
moving so slowly compared to the fields that their individual energy is not
affected by physical conditions of the coax in any way that you or I will
ever measure.

"ml" wrote in message
...
hi


just wondering how much and how to calculate the loss in some common
coax for ex lmr400 over a given bend

naturally i mean not to exceed it's bend radius spec

but i figure electrons want to stay in motion and 'prefer' to go
straight so if i make a bend some of that energy i recon will be lost


a 90 degree bend is within spec for the above and i wonder how much i
loose

i know some of my variables lmr400 90bend and for ex 20m and 70cm



thanks

the bends
 

oh, and don't forget.. individual electrons are oscillating back and forth
at the frequency of the rf, they aren't moving in one direction very far
before they reverse direction anyway.

"Dave" wrote in message
. ..
the only effect you will notice is if the bend is tight enough to move the
conductors enough to change the characteristic impedance. electrons are
moving so slowly compared to the fields that their individual energy is
not affected by physical conditions of the coax in any way that you or I
will ever measure.

"ml" wrote in message
...
hi


just wondering how much and how to calculate the loss in some common
coax for ex lmr400 over a given bend

naturally i mean not to exceed it's bend radius spec

but i figure electrons want to stay in motion and 'prefer' to go
straight so if i make a bend some of that energy i recon will be lost


a 90 degree bend is within spec for the above and i wonder how much i
loose

i know some of my variables lmr400 90bend and for ex 20m and 70cm



thanks

the bends
 

On Sat, 23 Dec 2006 14:04:35 GMT, ml wrote:

but i figure electrons want to stay in motion and 'prefer' to go
straight so if i make a bend some of that energy i recon will be lost

Hi Myles,

Any particular electron is not going very far, or very fast in that
direction. In fact, if you wanted to attach a message to an electron,
you could deliver the message faster by walking (much faster).
Technically, this focus on the electron falls into the topic of Drift
Velocity which in wire is literally as slow as molasses. Rather, it
is the speed of charge transfer that does the work we are familiar
with and with work, work lost to heat which returns us to your concern
of bend radius.

73's
Richard Clark, KB7QHC

the bends
 

In article ,
"Dave" wrote:

oh, and don't forget.. individual electrons are oscillating back and forth
at the frequency of the rf, they aren't moving in one direction very far
before they reverse direction anyway.

"Dave" wrote in message
. ..
the only effect you will notice is if the bend is tight enough to move the
conductors enough to change the characteristic impedance. electrons are
moving so slowly compared to the fields that their individual energy is
not affected by physical conditions of the coax in any way that you or I
will ever measure.

"ml" wrote in message
...
hi


just wondering how much and how to calculate the loss in some common
coax for ex lmr400 over a given bend

naturally i mean not to exceed it's bend radius spec

but i figure electrons want to stay in motion and 'prefer' to go
straight so if i make a bend some of that energy i recon will be lost


a 90 degree bend is within spec for the above and i wonder how much i
loose

i know some of my variables lmr400 90bend and for ex 20m and 70cm



thanks



ahh ok thanks guys, i don't know why i was looking at an electron and
thought it wanted to keep going in same direction (objects want to keep
going ...) so i thought that a bend wouldn't have made the electron
'want' to change direction

but i followed what you spoke of, i was thinking more volts and
forgot about rf still made me ponder

but all clear now

thanks again and HAPPY HOLIDAYS !!

the bends
 

"ml" wrote in message
...
ahh ok thanks guys, i don't know why i was looking at an electron and
thought it wanted to keep going in same direction (objects want to keep
going ...) so i thought that a bend wouldn't have made the electron
'want' to change direction

but i followed what you spoke of, i was thinking more volts and
forgot about rf still made me ponder

but all clear now

thanks again and HAPPY HOLIDAYS !!

While the others have given an explination, I have measuered the loss in the
past, did it on 4 pieces about 130 feet long wound in coils about 2 feet in
diameter a few weeks ago . Did that to check out the new coax I used to
install new antennas at my house to make sure the coax and connectors were
installed correctly. While I did not streach the coax out and do another
measurment, the losses met the specifications .