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The 400 Hz tone is at the low end of the designed in frequency response for the TRC 458, and the upper end is at 3500 Hz. I didn't make an exact fall off plot for mine, but the spec is 6dB down at a nominal 450 Hz on the low side. If you had, with a given volume control, RF gain, and modulation %, a 1 watt rms ac at the speaker at 1 Khz, it would decrease to 1/2 that vaule for 3dB down and by 1/2 again for 6dB down, for a nominal .25 w rms output, all else left as is.

Kind of limited in frequency response like POTS (plain old telephone system). Optimized for voice, but not as good as an AM clock radio. It may pass 400 Hz, but be down on audio. Upper end around 3500 Hz or so. Anything beyond on either side requires more bandwidth.

[QUOTE="KG6YGE, post: 415627, member: 28834"] The 400 Hz tone is at the low end of the designed in frequency response for the TRC 458, and the upper end is at 3500 Hz. I didn't make an exact fall off plot for mine, but the spec is 6dB down at a nominal 450 Hz on the low side. If you had, with a given volume control, RF gain, and modulation %, a 1 watt rms ac at the speaker at 1 Khz, it would decrease to 1/2 that vaule for 3dB down and by 1/2 again for 6dB down, for a nominal .25 w rms output, all else left as is. Kind of limited in frequency response like POTS (plain old telephone system). Optimized for voice, but not as good as an AM clock radio. It may pass 400 Hz, but be down on audio. Upper end around 3500 Hz or so. Anything beyond on either side requires more bandwidth. [/QUOTE]

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