×
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

Connectors

Connectors

Connectors

(OP)
We are currently designing a connector for a VGA Right Angle Cable (Antenna Isolator)

The problem we are running into is when we test with a right angle connection. When testing straight on, we have no problems, but as soon as the right angle joint is introduced, we get some insertion loss.

Trying to understand why. We are using a 100pF capacitor on a PCB that gave us the best results during trials with straight connections, but with the right angle, we get quite a bit of pixellation on our images.

Picture is attached

RE: Connectors

The right angle connector might be introducing an 'impedance bump' into the RF line, causing reflections and thus affecting the quality of the signal.

One would normally use a network analyzer to sweep the circuit or the suspicious right angle connector to see how bad its impedance characteristics really are.

It's not uncommon to see frustrated engineers or technicians remove bad adapters from the RF circuit and toss them into a very deep garbage can.

Clarifications: is your VGA a variable gain amplifier, not a video standard? Is it in a video transmission circuit, thus your mention of pixelization? Your post was a bit confusing since a VGA connector has a more common meaning related to analog video for PCs.

RE: Connectors

I think the "antenna isolator" stipulation clarifies the terminology.

Are you using a similar straight male/female connector, or are you connecting a connectorized cable? In the right-angle case, you have something like 4 additional insertion losses before getting into a cable, compared to a straight connector that directly terminates a cable.

TTFN
FAQ731-376: Eng-Tips.com Forum Policies

Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers

RE: Connectors

Is that a right angle adapter or a right angle connector in the photo? If the latter, I suspect a bad crimp/joint on the connector.

Z

RE: Connectors

(OP)
"I think the "antenna isolator" stipulation clarifies the terminology.

Are you using a similar straight male/female connector, or are you connecting a connectorized cable? In the right-angle case, you have something like 4 additional insertion losses before getting into a cable, compared to a straight connector that directly terminates a cable."

What would the 4 additional insertion losses be? How would we be able to reduce or eliminate them?

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