[SI-LIST] Re: Ribbon-coax to SMA cable solution for system integration application?
- From: "eoin.mcgibney" <eoin.mcgibney@xxxxxxxxxx>
- Date: Tue, 03 Oct 2006 16:10:01 +0100
Hi,
I agree with John, WL Gore do make some excellent phase stable cables,
phase stability of cables is sometimes over looked or
taken for granted (something I did myself) when making high frequency
measurements but is important.
When making measurements where a DUT is changed and hence cables are
moved, phase stable cables
are very good at holding a calibration. I had major issues trying to
make repeatible measurements on different DUTs
before I changed to phase-flex cables.
Regards,
Eoin
Hill, John wrote:
>Steve,
>
>I think it is WL Gore
>
>http://www.gore.com/en_xx/products/cables/flat/flat_cables.html
>
>As I recall, they also make some very good microwave test cables with
>very low change of phase with flexures. Lots of people make very
>accurate measurements with poor cables that change phase as you use
>them. Most braded coax cables are in that category.
>
>http://www.gore.com/en_xx/products/cables/microwave/index.html
>
>They also make GORE(tm) Bike Wear... Spandex shorts :-)
>
>http://www.gore.com/en_xx/products/consumer/bikewear/index.html
>
>Best regards,
>
>John
>
>
>=20
>
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>-----Original Message-----
>
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of steve weir
>Sent: Monday, October 02, 2006 11:06 PM
>To: steven@xxxxxxxxxxxxxxxxxxxx; SI-List
>Subject: [SI-LIST] Re: Ribbon-coax to SMA cable solution for system
>integration application?
>
>WM Gore
>
>Steve
>At 05:06 PM 10/2/2006, Steven Kan wrote:
>
>
>>Though we typically sell our products individually, we are commonly
>>
>>
>asked
>
>
>>about putting a bunch of them into a 19" rackmount box. Typically this
>>involves SMA or BNC bulkhead connectors on the front panel and a few
>>
>>
>dozen
>
>
>>cables to our standard assemblies, bolted to the bottom panel inside
>>
>>
>the
>
>
>>box. Here's one of our standard assemblies:
>>
>>http://tinyurl.com/jvec3
>>
>>and the results of just such an integration project:
>>
>>http://www.pulseresearchlab.com/products/systems/available.htm
>>
>>and the rat's nest inside:
>>
>>http://kan.org/download/SystemAssembly.jpg
>>
>>Today I was asked if we could build a big fanout system like this (18
>>modules), but with mass-terminated connectors to the outside world.
>>Furthermore, the signal count is higher than those we've done before
>>
>>
>(there
>
>
>>would be 144 cables inside the box).
>>
>>Does anyone know of a vendor that supplies good 50 Ohm ribbon-coax
>>assemblies that have a header-type connector (or other mass-terminated
>>connector) on one end, and has or will accept SMAs on the other end? I
>>
>>
>would
>
>
>>need 36 coax circuits per cable.
>>
>>This particular customer won't go much faster than 120 MHz (toggle
>>
>>
>rate),
>
>
>>but we'd like to find a solution with good SI so we can go faster for
>>
>>
>the
>
>
>>next customer. (The modules themselves will go >3.5 GHz)
>>
>>Thanks! I know the population here is more typically board-level
>>
>>
>experts,
>
>
>>but maybe there's a system integrator lurking quietly :)
>>--
>>Steven Kan (p) 310-515-5330 x24
>>Pulse Research Lab (f) 310-515-0068
>>1234 Francisco St., Torrance, CA 90502 (c) 818-620-3062
>>mailto:steven@xxxxxxxxxxxxxxxxxxxx
>>http://www.pulseresearchlab.com
>>Signal Buffering & Translation for Digital Design, Integration & Test
>>
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