According to Spielberger, the Ausf. A had an UKW-Empf. h radio, which stand for Ultrakurzwellen-Empfänger (literally “Ultra-shortwave receiver”, actually “FM-receiver”) but I can’t find anywhere what the h indicates, let alone more information on this device. Given the generic name, it’s very hard to search the Internet for it — try UKW-Empf. h in Google and you mostly get suggested results like “ukw empfang handy”, meaning “FM reception cellphone” …