[TowerTalk] Coax Switch Isolation

[DavidC]

What about 75 ohm lines in otherwise matched systems, such as
feeding a common tri-bander?

I hope to run CATV lines for most of my runs and I own one
of your switches, should I be concerned?

- Thanks! & 73, DavidC  K1YP in Hudson, FL

************************************************************************

> Pete,
> It is true amateur stations do not have perfect load impedances. The
ranges
> you mentioned compromise the isolation of switches somewhat, but not
> seriously. We have some customers who try to switch long wires with these
50
> ohm switches. (Can you believe it?) Then, everything goes out the window
and
> the sparks fly! So, that's really the extreme. Zoli sent me a list of the
> test set up he used and it is definitely professional lab quality and
> procedure. I can't account for what happened on those differences.
> 73 and thanks,
> Don,  W8AD
> Don Tyrrell at d.r.tyrrell@worldnet.att.net
> >
> > At 08:35 PM 6/14/00 -0700, don tyrrell wrote:
> > >
> > >Hi,
> > >I noted that someone measured one of our coax switches with a 26.5 dB
> > >isolation. ... They say the most common reasons for comparative test
> > >errors in non lab environments are: A. Improper use of, or faulty
jumper
> > >cable/connector assemblies. B. Improper or faulty test loads. These
must
> be
> > >exactly R50 plus J ZERO loads.
> >
> > Should I infer from this that with "normal amateur loads" ranging from,
> say
> > 35 to 75 ohms, */- J something, the isolation of this (and probably any)
> > switch is seriously compromised?
> >
> > 73, Pete Smith N4ZR
> > n4zr@contesting.com


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