TECHNET Archives

June 2005

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:
"Brooks,Bill" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brooks,Bill
Date:
Thu, 9 Jun 2005 10:03:54 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (52 lines)
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
-----------------------------------------------------

ATOM RSS1 RSS2