[TowerTalk] Coax Switch Isolation

[don tyrrell]

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
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <towertalk@contesting.com>
Sent: Thursday, June 15, 2000 12:14 AM
Subject: Re: [TowerTalk] Coax Switch Isolation


>
> 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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