14-11-2012, 01:34 PM
Joe,
See http://en.wikipedia.org/wiki/Characteristic_impedance
Actually the instructions say use as short a length of co-ax as possible, which is a bit odd because unless the co-ax is several wavelengths long you'll never 'see' it.
Al,
I find it logical if not sensible.
Ignoring the L, C and R4 I make the Impedance 78.16 - (270//(99+11)) - close enough I expect.
They say that the DA terminals want to 'see' 10R.
Again, ignoring L, C and R4 - less logical this time - I make it 10.282.
I agree that it's not clear why the 37R and 10R are there at all.
Alan
See http://en.wikipedia.org/wiki/Characteristic_impedance
Actually the instructions say use as short a length of co-ax as possible, which is a bit odd because unless the co-ax is several wavelengths long you'll never 'see' it.
Al,
I find it logical if not sensible.
Ignoring the L, C and R4 I make the Impedance 78.16 - (270//(99+11)) - close enough I expect.
They say that the DA terminals want to 'see' 10R.
Again, ignoring L, C and R4 - less logical this time - I make it 10.282.
I agree that it's not clear why the 37R and 10R are there at all.
Alan
