telegraphic signal vs radiotelegraphic signal

telegraphic signal and radiotelegraphic signal both are nouns.

Word	Noun	Adjective	Verb	Adverb
telegraphic signal	Yes	No	No	No
radiotelegraphic signal	Yes	No	No	No

As nouns, telegraphic signal and radiotelegraphic signal are synonyms defined as:

telegraphic signal and radiotelegraphic signal: a signal transmitted by telegraphy

telegraphic signal (noun)	radiotelegraphic signal (noun)
a signal transmitted by telegraphy	a signal transmitted by telegraphy