×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Microphonics

Microphonics

Microphonics

(OP)
I've seen microphonic-related problems on certain modems and LNBs (C-Band).  Anyone here point me the way to solve this problem, or point to a reference that not only describes it, but also offers at least a theory of its cause?  Thanks

RE: Microphonics

Vibration (Oilcanning) of a cover over a microstrip can cause microphonics problems. Stiffen the cover or dampen the cover currents with absorber to see if it helps. Also keep the microstrip channel as narrow as practical.

RE: Microphonics

The capacitance between leads and shield can induce microphonics. Try securely grounding the shield if there is one, or lifting the shield. If no shield exists and it is practical, use a shielded Ethernet cable. Without further details, it may be the connector, not the cable. Again, poor connection results in reflected power, induction, capacitance; all relating to the principles of the microphone.

Another solution may be a cap across the lines, but it is tricky with high speed Network. A cap across the leads has helped many times in other applications, such as Audio.
Merv

RE: Microphonics

Some ceramic CAPs may be microphonic, especially if they get polarized.( Hi V, hi temp.)

<nbucska@pcperipherals.com>

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close