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FM transmitter power consumption? - RF Cafe Forums

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 Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


Mr.Whatever
Post subject: FM transmitter power consumption? Posted: Thu Sep 28, 2006 8:56 am

Captain


Joined: Fri Apr 07, 2006 6:10 pm
Posts: 18
Hi all,

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.

Thanks!


Top

IR
Post subject: Posted: Thu Sep 28, 2006 2:00 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello,

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.

Hope that this helps!

_________________
Best regards,

- IR



Posted  11/12/2012
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