We called them "Bias Flags" if I remember correctly, and they were used to isolate the B+ line from the RF amp signal in most of the places we used them. In effect they dissipated the RF energy that tried to travel back up the line to the Bias circuit and made the path back to the bias point look like an open circuit to the RF signal. The size and shape of them was dependant on the freq we were using... The Bias line needed to be thin to present itself as a mismatched impedance to the RF path again... telling the signal "DO NOT ENTER" was the plan if I remember correctly... Since the 'flag' features were calculated in LIBRA by a microwave engineer we didn't learn much about how they calculated their geometry, but they are curious looking etched features. Best regards, Bill Brooks - KG6VVP PCB Design Engineer, C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 Datron World Communications, Inc. _______________________________________ San Diego Chapter of the IPC Designers Council Communications Officer, Web Manager http://dcchapters.ipc.org/SanDiego/ http://pcbwizards.com -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Matthew Lamkin Sent: den 9 juni 2005 15:30 To: [log in to unmask] Subject: Re: [TN] stubbing in circuit design? Being the uninitiated in RF design, and not having read the rest of the thread (all gone now) apart from what's in this reply, can I ask what those little/big triangles on the tracks are? And what/why they do etc. Thankyou. Matthew Lamkin. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------