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In article <1992Oct5.142505.23001@dxcern.cern.ch> dhina@dxcern.cern.ch (Mourad Dhina) writes:
>Hello,
>i am trying to realize a circuit i found in an electronics magazine.
>one of the components it uses is a semi-rigid coax cable of
>25 ohms impedance. this is the first time i hear of this (i only
>knew 50, 75 and 93 ohms cables, which are standard). anybody
>knows where to find this?
>Mourad

>Two 50-ohm cables in parallel?

>-- 
>:- Michael A. Covington     internet mcovingt@uga.cc.uga.edu 
>:- Artificial Intelligence Programs       phone 706 542-0359
>:- The University of Georgia                fax 706 542-0349
>:- Athens, Georgia 30602 U.S.A.          amateur radio N4TMI

Two 50-ohm cables will work as a 25-ohm cable, as suggested. However, if the
author is using semi-rigid cable it probably is for quite a high-frequency
application and you may have trouble making connections to it which will
be clean enough.

Most manufacturers of semi-rigid cable sell it in a variety of impedances.
The Precision Tube catalog shows cables from 15 to 95 ohms, and Micro-Coax
from 10 to 95. Both have 25-ohm cable. There are many others -- I just
have these two catalogs handy.

     Precision Tube: (215) 699-5801
     Micro-Coax: (215) 489-3700

Roy Lewallen