The following 100 Hz DSP CW filter response was measured with a calibrated signal fed directly to ADC input on A7 board. 156 Hz width at -6 dB 378 Hz width at -40 dB (sidelobe peak) 512 Hz width at -
Sinisa, Thanks for this data. Among other things, it confirms that "100 Hz" BW isn't exactly knife-edge filtering -- as you'd expect from 199 taps and 14 kHz IF, I suppose. A number that might also b
When I measure the audio response, I find that the width at -6dB is 107hz and at -60dB it's 298hz Spectrum taken shown at http://n1eu.com/100hz_v2056.gif 73, Barry N1EU ______________________________
That's essentially the audio filter's response, given that IF filter is much wider. 73, Sinisa YT1NT, VE3EA _______________________________________________ TenTec mailing list TenTec@contesting.com h
Sinisa, do you think the v2 i.f. response is similar to the audio response of v1.373? In other words, in v2 they added the audio filter as post-processing to the v1 filter? 73, Barry N1EU ___________
Exactly. It is easy to verify that with V2 a strong carrier off-tuned to just become inadible is still causing S meter deflection and AGC action (with threshold set appropriately). 73, Sinisa YT1NT,