I have used the Getek and the Rogers 4003 (4350) series materials. Both have
excellent properties depending on the affects you are most concerned about.
The 4003 materials have a performance edge (better Er and loss tangent), but
the Getek was more cost competitive for use when I last checked in to these
material. I have never used the Nelco equivalent or the Tetra 2 materials.
Use a material that the fabricator you plan to work with is familiar with
to minimize fabrication problems and cost.

Jeffrey A. McGlaughlin
Sr. PCB Designer
Battelle Memorial Institute
Columbus Ohio
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        -----Original Message-----
        From:   Alexis Meehan [SMTP:[log in to unmask]]
        Sent:   Thursday, 03 February, 2000 12:21
        To:     [log in to unmask]
        Subject:        [DC] High-Speed Materials

        We are currently researching materials that will handle high-speed
circuits
        (over 1 ghz) better than the current FR4 that we've been using.
We've talked
        to our fab vendors and they are recommending alternatives such as
Getek,
        Tetra 2, and Rogers 4350. Now I'd like to hear from the end users.
Has
        anyone out there gone through a similar transition? What were your
        experiences with the more costly materials? Any input would be
greatly
        appreciated.

        ********************
        Alexis Meehan
        PCB CAD Mgr.
        408-328-4595
        [log in to unmask]
        LuxN, Inc.
        570 Maude Court
        Sunnyvale, CA 94086