-----Original Message-----
From: Ron Spencer via Groups.Io <ron.spencer@...>
To: nanovna-users <
[email protected]>
Sent: Wed, Aug 21, 2019 2:26 pm
Subject: Re: [nanovna-users] New to group and thoughts on Return Loss and Loss
In my early career I had the wonderful opportunity to work, in sales, for HP. Back before it was Agilent or Keysight. Back when Bill and Dave were alive and running the company.?
They spent a great deal of time and money educating us. So we might have some credibility when talking with engineers. One thing I will always remember is that return loss is ALWAYS positive. No idea why this stuck as it has.?
Indeed you will see it expressed both ways. Only one is correct. While I am the one saying it (here) I'm only repeating what the fine folks at HP (who, I think we can all agree, knew their stuff) taught me and generations of engineers.?
Simply put, its the measurement of signal returned (reflected) vs signal applied. How can that be negative? The most you can get back is 100% (short or open) or 0 (perfectly matched load). Everything else is something in between.?
Some things are gray, some black and white. This is the later.?
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---- On Wed, 21 Aug 2019 16:58:01 -0400 Jerry Gaffke via Groups.Io <jgaffke@...> wrote ----
Indeed.
Do a web search for "is return loss positive or negative".
You'll turn up lots of forums in which to pontificate.
Short answer:
It's done both ways, and nobody finds this confusing.
But they sure have fun arguing about it.
My new word for the day:? besserwisserness
Could be handy, now I'll know what they mean
when people point it at me!
Jerry
On Wed, Aug 21, 2019 at 11:33 AM, Hans J Albertsson wrote:
Don't overdo the besserwisserness of your insights.
