Re: [Repeater-Builder] Duplexer Loss Question

Tue, 22 Mar 2005 18:58:04 -0800

Thanks Mike, well I wanted to make sure that I was not loosing the ability to do basic math, but for some reason I had the duplexers retuned and whenI dumped 200 watts into them, I got only 65 to 70 back out of them.  Trying to figure what when wrong in the process.
 
Mathew


Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote:

At 10:59 AM 3/22/05, you wrote:

>I am curious with a set of TX-RX duplexers at 1.5 insertion loss,
>input power of 150 watts, what would be the power output? Need to
>know, as I don't think they are tuned correctly, or something might
>be wrong here.
>
>Mathew

See

From that table 1.5 is 29.2%, so
150 times 0.292 = 43.8
150 less 43.8=106.2 watts

A few numbers worth remembering:
1db is about 20%
1.5db is about 30% (actually 30% is halfway between 1.5 and 1.6)
3db is about 50%
6db is about 75%
10db is 90%
20db is about 99%
All of the above numbers are close enough for field work, especially
when you factor in feedline and connector loss.

And 3db is double the power
10db is 10 times the power
20db is 100 times the power.

The big think is that you hear the






Yahoo! Groups Links

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/

<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/




Do you Yahoo!?
Yahoo! Mail - 250MB free storage. Do more. Manage less.






Yahoo! Groups Links

Reply via email to