The cutoff would be higher than 2.7kHz. What you add to the high
frequency end is subtracted from the low end.
The high end is normally about 3kHz which means the low end of the
roofing filter is at about 300Hz.
Yes, ESSB operation would require the 6kHz roofing filter.
73,
Don W3FPR
On 12/25/2018 12:05 PM, W2xj wrote:
The rule for a balanced sound is that the product of the lowest and highest
frequency should be between 450,000 and 500,000. So for a 2.7 KHz cutoff that
means a low cut of 166 to 185 Hertz, or rounding that could be 200 Hertz.
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