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I should have mentioned that the same basic setup for finding audio bandwidth can also be used to generate an audio frequency response curve for your radio. Just connect an AC voltmeter across the speaker. I use an old Heathkit Audio VTVM because its 10 megohm input impedance doesn't load down the circuit. Simply record the voltmeter readings every 100hz or so, and plot them out on a graph of Freq vs Audio amplitude. The resulting curve will show you the freqs you need to boost or cut to get flat response. Hook the W21HY inline between the generator and the radio, and adjust the EQ to get a reasonably flat response curve (or a response curve that you like).

Most of the really good mics have a response curve in their spec sheet. With the baseline you generated above, you can readjust the Eq for almost any given mic.

If you're looking for natural-sounding audio, this is a good way to get it. 73s.

- 399

<blockquote data-quote="unit_399" data-source="post: 552908" data-attributes="member: 7311">I should have mentioned that the same basic setup for finding audio bandwidth can also be used to generate an audio frequency response curve for your radio. Just connect an AC voltmeter across the speaker. I use an old Heathkit Audio VTVM because its 10 megohm input impedance doesn&#039;t load down the circuit. Simply record the voltmeter readings every 100hz or so, and plot them out on a graph of Freq vs Audio amplitude. The resulting curve will show you the freqs you need to boost or cut to get flat response. Hook the W21HY inline between the generator and the radio, and adjust the EQ to get a reasonably flat response curve (or a response curve that you like).Most of the really good mics have a response curve in their spec sheet. With the baseline you generated above, you can readjust the Eq for almost any given mic.If you&#039;re looking for natural-sounding audio, this is a good way to get it. 73s.- 399</blockquote>

[QUOTE="unit_399, post: 552908, member: 7311"] I should have mentioned that the same basic setup for finding audio bandwidth can also be used to generate an audio frequency response curve for your radio. Just connect an AC voltmeter across the speaker. I use an old Heathkit Audio VTVM because its 10 megohm input impedance doesn't load down the circuit. Simply record the voltmeter readings every 100hz or so, and plot them out on a graph of Freq vs Audio amplitude. The resulting curve will show you the freqs you need to boost or cut to get flat response. Hook the W21HY inline between the generator and the radio, and adjust the EQ to get a reasonably flat response curve (or a response curve that you like). Most of the really good mics have a response curve in their spec sheet. With the baseline you generated above, you can readjust the Eq for almost any given mic. If you're looking for natural-sounding audio, this is a good way to get it. 73s. - 399 [/QUOTE]

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