"If you were in an unsteady approach [purely hypothetical at tis HEIGHT hopefully] and undulated above and below one of the heights relating to a callout, would you hear the callout every time you descended below [propbably should read through] the said height."
Actually, the newer systems are designed not to do this. You will have to climb above the first altitude callout you heard to reset and hear them again. Theoretically, a repeating callout would only happen at the first height.
The height options for the NG, according to our Maintenance Manual, are...
2500 ("Twenty Five Hundred" or "Radio Altimeter").
1000
500
400
300
200
100
50
40
30
20
10.
Then there are the "Minimums" or "Minimums, Minimums" callouts and the following....
"Plus Hundred" (when 100' above DH)
"Approaching Minimums" (when 80' above DH).
"Approaching Decision Height"
"Decision Height"
Customers can also request special heights, such as 60'.
Regards.
Q.
P.S. Some desktop simulators allow you to select the ones you want to hear.