TECHNET Archives

May 1998

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Fred Watt <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 21 May 1998 08:25:09 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (15 lines)
        Has anybody had any problems with FR-4 at 100 to 200 MHz?  I have several boards from several fabrication shops in which the signal loses amplitude above 80-100 MHz.  The boards are controlled impedance (50 Ohms) with 5 mil traces and 5 mil dielectrics.  The traces are about 6.5" long.
        I would appreciate any comments on this subject.  The supplier of the material says that FR-4 should be good to 400 MHz.

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################


ATOM RSS1 RSS2