SR and SC Series NTP Servers Help and Support: LF Radio Troubleshooting Tips Models that this article applies to: SR Series: SR7110, SR9210, SR9750, SR9850, SR9860D with MSF or DCF-77 LF radio antenna. SC Series: SC7105, SC9205, SC9705 with MSF or DCF-77 LF radio antenna. Summary Struggling to get a good LF radio signal ? […]