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Date: | Fri, 1 Feb 2002 13:52:52 -0500 |
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Hi Bret,
If I recall my old theory, you neeed to know where the losses occur. So,
you have a 50-Watt output, but you have -3 Db loss in the transmission line
and duplexer. This reduces your power considerably at the antenna before
you apply the one Db. gain.
I think my old license book had tables to apply the logarithmic formula for
power as well as voltages based on decibel equivalents.
----- Original Message -----
From: "Brett Winchester" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, February 01, 2002 12:04 PM
Subject: need formula
I am working on the extra and a question on decibel got our local tech net =
going last night. =20
If you have a transmitter with a 50 wat output a db -3db and db loss in =
transmission lines duplexers and combiner with an antenna with a db gain, =
what is your output in watts?
Can anyone tell me how to solve this step by step. I assume you integrate =
the losses and gains for a total system gain of 2db but am not sure how to =
plug that into the formula.
Can you convert all to logs and vis versa to make the problem simpler?
Thank You!
BRETT K WINCHESTER PM KD7JN
[log in to unmask]
http://www.icbvi.state.id.us/brochure/RADIO.HTM=20
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