Comparison of two audio curves in two-way radio receivers. Please credit David Jordan when using this image. The magenta line is a commercial two-way radio without a CTCSS filter. The blue line is an imported communications receiver. Some trade journal articles say idealized audio curves differ from one language to another. One article said US hand-held radios had their audio response altered to work with an Asian language.

This curve was plotted (in the 1980s) by setting a signal generator to generate a carrier on the receiver's channel with a 1,000 Hz tone at two-thirds system deviation. The receive audio was terminated into a transformer matching the specified speaker impedance. Volume was set for 2 volts across the transformer. Without changing the generator's deviation level, voltage was measured at each frequency along the graph's bottom edge. The numbers were plugged into a spreadsheet and plotted.

I, the copyright holder of this work, hereby publish it under the following license:

	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. Subject to disclaimers.
	You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. Subject to disclaimers.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

The PNG crusade bot automatically converted this image to the more efficient PNG format. The image was originally uploaded as "Audiocv.gif".

22:14:49, 23 September 2006 . . David Jordan (Talk | Contribs) . . 624x547 (6,701 bytes) (Comparison of two audio curves in two-way radio receivers. Please credit David Jordan when using this image. The magenta line is a commercial two-way radio without a CTCSS filter. The blue line is an imported communications receiver. )

This media file is uncategorized. Please help improve this media file by adding it to one or more categories, so it may be associated with related media files (how?), and so that it can be more easily found. Please notify the uploader with {{subst:Please link images|File:Audio curves graph.png}} ~~~~