LGDT has "wobbulator" in English for the French "wobbulateur", but not "wob(b)lation"

Using the other spelling (see below, for Termium), with a V rather than a W, it has:

Domaine(s)
télécommunication
radiocommunication

Anglais
wobble modulation (a)
Frequency modulation of a carrier at a frequency low relative to that of any subsequent amplitude modulation. (a)

ululation n f (a)
recommandé par un organisme national ou international
Modulation de fréquence d'une porteuse par une oscillation dont la fréquence fondamentale est très basse par rapport aux fréquences du signal éventuel modulant en amplitude la même porteuse. (a)

Synonyme(s):
vobulation n f (a)
recommandé par un organisme national ou international
[1970] RBT4493496

Termium translates it (but also writes it: *wobbulation*, with 2 Bs, in French):

English:Electronics
staggering s NOUN
1981-03-19

And, to help clarify the concept some more, here is Termium's entry for "vobulateur, wobbulateur, hululeur ou générateur modulé en fréquence":

English:Electrical Measurements
sweep generator s CORRECT
FM signal generator s
sweep oscillator s CORRECT,SEE RECORD
wobbulator s CORRECT,SEE RECORD
DEF - A test instrument that generates a radio-frequency voltage whose frequency varies back and forth through a given frequency range at a rapid constant rate; used to produce an input signal for circuits or devices whose frequency response is to be observed on an oscilloscope. s
DEF - for "sweep oscillator" : An oscillator in which the output frequency varies continuously and periodically between two frequency limits. s
DEF - for "wobbulator" : A device, usually mechanical, used to frequency-modulate an oscillator for test purposes. s
1982-04-07