Summary

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.

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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. )

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