Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: FM transmitter power consumption? Posted:
Thu Sep 28, 2006 8:56 am
Joined: Fri Apr
07, 2006 6:10 pm
I'm really not that
familiar with a design of an FM transmitter, but I wanted to know about
its power consumption. Does the power consumption fluctuate depending
on amplitude of the input signal or is it constant regardless if there
is an input or not?
I'm assuming that the antenna impedance remains
constant during its operation.
Post subject: Posted: Thu Sep 28, 2006 2:00 pm
Joined: Mon Jun 27, 2005 2:02 pm
In FM modulation the frequency of the carrier
changes as a function of the modulating signal (Data), therefore the
output power remains constant and thus the power consumption. If there
is no input signal, the modulator will still transmit in the same output
power and in the carrier frequency (Without frequency deviation), so
the power consumption will still remain the same.