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Just received my H4. If I calibrate for a range of, say, 144-174 MHz, can I change the range to 144-148 without recalibrating? I guess I'm asking under what circumstances is recalibration necessary?

You will only have valid measurements within the frequency range you calibrated. You can decrease the frequency range and the firmware will interpolate between the calibrated points but the accuracy will decrease.

I would re-calibrate when I change to 144-148 MHz. That way I'd be sure.
I'd probably save that in a different memory slot than the 144-174 MHz.

Zack W9SZ

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On Tue, Apr 22, 2025 at 10:35?AM Kenneth Roberts via groups.io <kenr313=
[email protected]> wrote:

Just received my H4. If I calibrate for a range of, say, 144-174 MHz, can
I change the range to 144-148 without recalibrating? I guess I'm asking
under what circumstances is recalibration necessary?