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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?

New here. Any tricks to make calibration easier? It is a real hassle as it is.

If you use SAVER on a PC or laptop, you can store your verious cals on
those and access them later for use. Calibrate once for each frequency
range and setup.....store on a "big" PC........recall for use.

Other than that, yes, you should cal. for every change in frequency range.
That's only three standards! Of course, you must first remember to clear
any pre-existing cals and store the new cal when done.

Dave - W?LEV

On Fri, Apr 25, 2025 at 8:30?PM KK7OYV via groups.io <kk7oyv=
[email protected]> wrote:

New here. Any tricks to make calibration easier? It is a real hassle as it
is.

--

*Dave - W?LEV*


--
Dave - W?LEV

On Fri, Apr 25, 2025 at 01:30 PM, KK7OYV wrote:

New here. Any tricks to make calibration easier? It is a real hassle as it is.

Surprised you said that. Only takes about 2 minutes for the whole procedure. And if you don't care about S21 measurements you can skip the last two steps and only do SOL (short-open-load)

Roger

Hello,

On Tue, Apr 22, 2025 at 8:40?AM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

You will only have valid measurements within the frequency range you
calibrated.

Am I reading this right as: I should always configure the stimulus range
first, and then calibrate. For example, if I want to get an overall (not
finely granular) sweep of a multiband antenna from 3...30MHz, I would first
select this as stimulus range and then calibrate? If I then want to show a
single band, like just 40m or 20m, I would again set those respective
ranges and recalibrate?

Thanks, andreas K6OTT

You got it! Yes.

Dave - W?LEV

On Mon, Apr 28, 2025 at 10:24?PM Andreas Ott K6OTT via groups.io <andreas=
[email protected]> wrote:

Hello,

On Tue, Apr 22, 2025 at 8:40?AM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

You will only have valid measurements within the frequency range you
calibrated.

Am I reading this right as: I should always configure the stimulus range
first, and then calibrate. For example, if I want to get an overall (not
finely granular) sweep of a multiband antenna from 3...30MHz, I would first
select this as stimulus range and then calibrate? If I then want to show a
single band, like just 40m or 20m, I would again set those respective
ranges and recalibrate?

Thanks, andreas K6OTT

--

*Dave - W?LEV*


--
Dave - W?LEV

On Mon, Apr 28, 2025 at 03:23 PM, Andreas Ott K6OTT wrote:

Am I reading this right as: I should always configure the stimulus range
first, and then calibrate. For example, if I want to get an overall (not
finely granular) sweep of a multiband antenna from 3...30MHz, I would first
select this as stimulus range and then calibrate?

Yes Reset first and then calibrate

If I then want to show a single band, like just 40m or 20m, I would again set those respective
ranges and recalibrate?

If what you are measuring does not have sharp valleys and peaks in SWR then you can just reduce the stimulus range on some NanoVNA's (like the -H and -H4) and the device will interpolate between the calibrated points and give you a fairly good estimate of SWR and Return loss.

But your best option if you are only interested in HF is to calibrate for the entire HF band from 2 to 30 MHz and store that in slot 0. Then calibrate and store your other favorite bands in the remaining slots. That way you can turn it on and be set to go.

Roger