Impedance Matching Problem

[Openhiemer]

Hello,

I have a impedance matching problem that I need help with.

I have a 1Mb data transmission system that is designed to work with 100-150
ohm cable, We would like to use it on 55 ohm cable.

If anyone thas has a good understanding of transmission line theory and
would like to help out (I can probably pay for time of the problem is
solvable) please e-mail me.

To e-mail me please change the z characters to o characters and the hat
symbol to a at symbol. itmaster2001^yahzz.cz.uk (hopfully mailbots ar not
that bright yet)

Thanks

 

[Jana]

It would be much cheaper to get the right type of cable. You would not want
to pay out the time for an engineer to do the R&D then the design for the
conversion. This would have to be done with an active design in order to be
efficient. When converting impedances, there will always be some type of
return loss.

Order yourself the proper cable and do the job right, especially if this is
for a client.

--

JANA
_____


"Openhiemer" <openhamer@dot.dot> wrote in message
news:Xns9622BFF6B58BDopenhamermicrosoftco@158.152.254.254...
Hello,

I have a impedance matching problem that I need help with.

I have a 1Mb data transmission system that is designed to work with 100-150
ohm cable, We would like to use it on 55 ohm cable.

If anyone thas has a good understanding of transmission line theory and
would like to help out (I can probably pay for time of the problem is
solvable) please e-mail me.

To e-mail me please change the z characters to o characters and the hat
symbol to a at symbol. itmaster2001^yahzz.cz.uk (hopfully mailbots ar not
that bright yet)

Thanks

 

[Robert Lacoste]

If you can't change the cable then the easiest way will be probably to use
transformers at each end of the line to do the impedance matching. As far as
I remember to do a 1 to 2 impedance adaptation then the turn ratio of the
transformer should be 1:1.414. And theoritically the losses will be zero.

Cheers,

--
Robert Lacoste
ALCIOM - The mixed signal experts
www.alciom.com


"Openhiemer" <openhamer@dot.dot> a écrit dans le message de news:
Xns9622BFF6B58BDopenhamermicrosoftco@158.152.254.254...

Hello,

I have a impedance matching problem that I need help with.

I have a 1Mb data transmission system that is designed to work with
100-150
ohm cable, We would like to use it on 55 ohm cable.

If anyone thas has a good understanding of transmission line theory and
would like to help out (I can probably pay for time of the problem is
solvable) please e-mail me.

To e-mail me please change the z characters to o characters and the hat
symbol to a at symbol. itmaster2001^yahzz.cz.uk (hopfully mailbots ar not
that bright yet)

Thanks

 

You can match the impedance easily with a simple resistive network, but
at the cost of a significant loss in signal level.

As someone has already posted, your best bet would be to purchase a
cable having the designed-for impedance.


Harry C.