Posted by Rick Merrill on 04/28/07 12:22

Smarty wrote:
> Four more thoughts:
>
> 1, The MTS-4 has both an audio output jack on the rear which will allow you
> to hear / scope the audio before it hits the modulator. Connect up at this
> point to determine if the compander is at fault.
>
> 2. The Cadco modulators have an internally defeatable pre-emphasis curve
> which may be set for compensating highs. Be sure this is set correctly.
>
> 3. The MTS has a lot of output voltage and could be adding 10 DB or more
> gain after beyond the companding. Make sure that your compander output is
> not way beyond your modulator's input range (this is nappy's point, but is
> more specifically relevant since the MTS puts out a big signal....)
>
> 4. Lastly, the compander has a remarkably narrow 5Khz bandwidth, quite
> adequate for a call in talk-show telephone line or AM radio microphone, but
> not much else. Take the compander out of the circuit altogether and see how
> the wider bandwidth audio sounds with respect to sibilance and let us know.
> We should then be able to help you further.
>
> Smarty
>

Thanks very much for that analysis! It should give me a fighting chance!

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