2.5khz 7.5khz and 22.5khz.
It's called ground filter, so I imagine it is taking the receive signal and using a band pass or high pass to cut out unnecessary harmonics. Band pass will cut out anything above or below the selected frequency range, high pass cuts out anything above a designated cut-off frequency. Not sure exactly how Whites set it up on the V3i as far as the band pass frequency range goes. I imagine the high end of the frequency range is constant for the band pass filter, and the frequency you select adjusts the low end of the frequency range. Where as with the high pass setting you are cutting out anything below the selected frequency, so the lower number the setting, the less harmonics you are cutting out.
Bandpass graph on top, High pass on bottom:
It's called ground filter, so I imagine it is taking the receive signal and using a band pass or high pass to cut out unnecessary harmonics. Band pass will cut out anything above or below the selected frequency range, high pass cuts out anything above a designated cut-off frequency. Not sure exactly how Whites set it up on the V3i as far as the band pass frequency range goes. I imagine the high end of the frequency range is constant for the band pass filter, and the frequency you select adjusts the low end of the frequency range. Where as with the high pass setting you are cutting out anything below the selected frequency, so the lower number the setting, the less harmonics you are cutting out.
Bandpass graph on top, High pass on bottom:
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