Just checked a reference on the K-type airships used in WWII, a.k.a. Goodyear ZNPK Airship. While this was just a line drawing, it showed a GP-7 with RU for Liaison, GF/RU for Command and an LM freq meter, plus IFF and Radar equipment. TCS would have sufficed both comm types I think. No wonder it was installed in some of them.