to follow on, stripline or microstrip? are you deembedding the traces to
remove fixturing from the loss measurement.
Scott McMorrow
Consultant - R&D
16 Stormy Brook Rd
Falmouth, ME 04105
(401) 284-1827 Business
http://www.teraspeed.com
On Tue, Apr 7, 2015 at 5:13 PM, Tom Dagostino <tom@xxxxxxxxxxxxxxxxx> wrote:
Joel
What is your test method? How are you connecting to the board? What test
equipment are you using? Are you measuring the same net on both boards?
Tom Dagostino
Teraspeed Labs
9999 SW Wilshire Street
Suite 102
Portland, OR 97225
tom@xxxxxxxxxxxxxxxxx
www.teraspeedlabs.com
971-279-5325 office
503-430-1065 cell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
Behalf Of Joel Brown
Sent: Tuesday, April 07, 2015 2:01 PM
To: SI-List
Subject: [SI-LIST] Why is my PCB loss so high?
We have had several boards made from Isola FR408HR.
My understanding is that at 3 GHz loss should be about 0.3 db / inch.
On one board I am measuring about 0.76 db / inch, on another 1.4 db / inch.
What can account for this?
Thanks
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