LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #3   Report Post  
Old January 7th 07, 02:46 AM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Aug 2006
Posts: 106
Default FM XMTR distortion measurements

You have to control the levels so that the transmitter doesn't get
driven into deviation limiting. Usually testing is done at 60% of system
deviation. I am assuming this is a land mobile transmitter? Connecting a
tone generator to the microphone terminals is best way to control the test.

chuck wrote:

In making FM transmitter distortion measurements, does anyone inject
the 1 kHz audio signal into an FM transmitter by holding the
microphone next to a speaker? It would seem that neither speaker nor
microphone would produce enough distortion of a single frequency to
affect the results, and in any case, the microphone is part of the
system being tested.

The idea would be to avoid having to fiddle with the variety of
microphone connectors out there.

I suppose I can and should compare the results of this technique with
applying the audio signal directly to the microphone input terminal.


Appreciate any thoughts. TIA.

Chuck
NT3G

----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet
News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World!
120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption
=----



--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P

 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Current through coils Reg Edwards Antenna 939 April 4th 06 01:33 AM
FCC: Broadband Power Line Systems Paul Policy 0 January 10th 05 06:41 PM
CCIR Coefficients METHOD 6 REC533 // AUCKLAND --> SEATTLE http://CBC.am/ Shortwave 0 July 16th 03 09:21 AM


All times are GMT +1. The time now is 07:59 PM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017