8 db.
This number was obtained by observing a signal generator carrier signal
in Spectrogram (AGC off) with the 2.7 KHz filter. Then each
progressively narrow filter was kicked in and the gain adjusted for the
same peak value.
The 200 Hz filter also needs 8db and perhaps a bit more.
The method leads to no loss in signal audio as the width control is
progressively decreased.
73 de Brian/K3KO
On 4/4/2013 03:30, Vic K2VCO wrote:
I don't have a 250 Hz filter, but both of my 400 Hz ones do require a
few dB. I am more surprised that your main filter requires NO boost,
than that your sub requires 6 dB. How much do others who have 250 Hz
filters use?
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