[TowerTalk] Coax Switch Isolation

[don tyrrell]

David,
We have tested this arrangement and the degradation is minimal. In an
otherwise matched system, it seems fine. Thanks,
Don Tyrrell at d.r.tyrrell@worldnet.att.net
----- Original Message -----
From: "DavidC" <eDoc@netzero.net>
To: "don tyrrell" <d.r.tyrrell@worldnet.att.net>;
<towertalk@contesting.com>; "Pete Smith" <n4zr@contesting.com>
Sent: Thursday, June 15, 2000 7:40 AM
Subject: Re: [TowerTalk] Coax Switch Isolation


>
> 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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