Geotech, a question about Vdi normalization

Can you please explain some of the disadvantages using say a higher frequency on a detector yet have the Vdi normalized say to 6khz?

For example, take this new HF Deus coil.

Could the normalization process degrade this coil and detector's separation abilities in nails and iron---tone being provided to user on nonferrous?
Could normalizing to a lower frequency like 6khz while a higher frequency is being utilized, and we realize highly masked nonferrous targets using Deus tend to start IDing closer to iron range.
Would using normalization here accelerate this nonferrous target's reporting towards the iron range ,,and hence make the nonferrous undetectable? With this same nonferrous target being tonally detectable with no normalization employed?

What in your opinion is the reason why XP would have set programming using the low frequency coils to normalize to 18khz ONLY?

Normalization doesn't affect the way a detector responds to targets, it only affects the way they are reported. Without normalization, every operating frequency would have unique target IDs for everything, meaning you'd have to remember what all those IDs are if you hunt with different frequencies. Worse, you have to set up unique disc masks for each one. Normalization is just a convenience thing.

At higher frequencies non-ferrous target start bunching up toward the high end of the VDI scale. Silver coins start looking alike and you end up with a large foil range. Not a bad thing if you're prospecting. Normalizing at 6kHz spreads this back out, but does so with simple scaling; nothing actually gets shifted toward the iron range.

Low frequencies bunch things up toward the salt/foil range, and normalizing to a high frequency would spread them back toward the higher end. I don't see either case as being harmful to whether a given target gets masked or not.

A high frequency coil will see all low-frequency targets as very similar - there will be little measureable difference between a zinc cent and a silver dollar (to use US coinage examples). To normalise to a lower frequency like 12 or 18KHz means you've got to stretch out those small differences so the zinc cent and the dollar are, say, 20 VDI points different. That puts demand on your machines mathematical abilities, and you may find the result is jumpy numbers.

As to why XP normalise to 18KHz: I think it's because it's primarily a relic machine, designed for European hunting, where 'good' targets can range from 30KHz to 3KHz. Hence why 18 and 12KHz are the most-used operating freqs in Europe. US-style milled silver coin hunting is not really its niche, and the ability to give clear distinctions between zinc cents, copper cents and dimes would not interest most of their customers.

Thank you gentlemen for responding.

I was wondering the why behind it seems detectors made abroad, why they seem to dodge the normalizing to lower frequency,
Rutus alter71 detector made in Poland being an exception.

Presumed there may be an operational/performance reason as to the why.

This kind of also touches on the hot key topic as well, but I like the V3's ability to zoom in and out from three frequency to single frequency, and from normalized and non-normalized. Its like using a zoom feature and its way cool. And simple to do with the live controls.

Very coil specific though. You need a cheat sheet.

HH
Mike