×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

50 ohm to 75 ohm impedance converter

50 ohm to 75 ohm impedance converter

50 ohm to 75 ohm impedance converter

(OP)
how can I build an impedance converter used for transforming 50 ohms to 75 ohms or 75 ohms to 50 ohms with virtually no loss. Does anyone know schematic?
thanks for any help in advance

RE: 50 ohm to 75 ohm impedance converter

What frequency is it using?

RE: 50 ohm to 75 ohm impedance converter

Depending on the application, the best solution ~might~ (?) be to simply connect them directly together (ignoring the slight mismatch).  In the real world, things are rarely exactly 50 or 75 ohms.  And it often doesn't matter.

More details ?

RE: 50 ohm to 75 ohm impedance converter

I know I posted a reply to this question over the weekend. Was the thread deleted?

Use a transformer: transformers change impedance according to the relationship Z1/Z2 = (N12/N22) where Zx is impedance and Nx is number of turns for the primary and secondary windings respectively.

Transformers can be made very efficient by careful winding design and choice of core material.


----------------------------------

If we learn from our mistakes,
I'm getting a great education!

RE: 50 ohm to 75 ohm impedance converter

I saw it ScottyUK!  Your mind is intact. New poster maybe... violated the functional email requirement.

RE: 50 ohm to 75 ohm impedance converter

Hi ItSmoked,

Don't take this as evidence of my sanity. You wanna see the evidence in the other pile...

----------------------------------

If we learn from our mistakes,
I'm getting a great education!

RE: 50 ohm to 75 ohm impedance converter

Scotty, I thought I saw your transformer post in another thread...

RE: 50 ohm to 75 ohm impedance converter

I think that we all know what happened to that post. The question is a typical student question. Especially the wording "with virtually no loss" points to that. That is not something that a working man would put in his question. It is also clear that the assignement was about HF/VHF and that the expected answer was a stub with a certain length.

I think that txdao(industrial) should do his homework on his own.

Gunnar Englund
www.gke.org

RE: 50 ohm to 75 ohm impedance converter

How on earth did it end up in there...?

Wierd!!

----------------------------------

If we learn from our mistakes,
I'm getting a great education!

RE: 50 ohm to 75 ohm impedance converter

Soctty's post must have been transformed with virtually no loss.

Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.

RE: 50 ohm to 75 ohm impedance converter

Ah... Now someone owes someone a beer! :)

RE: 50 ohm to 75 ohm impedance converter

good good

Gunnar Englund
www.gke.org

RE: 50 ohm to 75 ohm impedance converter

ScottyUK,

You answered a new irrelevant question in an existing thread. After answering, you mentioned that he should begin a new thread. Looks like he did. The irrelevant question has been deleted. The answer is gone now too after I RFed it. It looked a little lonely out there without a corresponding question.

RE: 50 ohm to 75 ohm impedance converter

Stevenal,

Thankyou for clearing up my mess!

----------------------------------

If we learn from our mistakes,
I'm getting a great education!

RE: 50 ohm to 75 ohm impedance converter

Use a stub matching circuit which will require a piece of double-sided PCB, Protel and a smith chart!. Look up stub matching on google or get a textbook written by CHENG to show you how to do it.

RE: 50 ohm to 75 ohm impedance converter

You will also need to know what frequency you want to match the 50 to 75 ohm line too.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources