500 kHz - Wikipedia
630 meters Ham Radio - Old is New, Again - Making It Up
A Portable QRP CW Amateur Transceiver for 475 KHZ 630 Meter - Etsy
New 630-Meter Band Reported “Very Busy”
Casella CEL 630.A Type 2 Ultra Wide Octave Band Sound Level Meter Kit
Ham Radio - My 630 meter magloop. An overview - YouTube
FCC Opens 630/2200 Meters Amateur Band; Pre-Registration Required!
WD8DAS 630-Meter Band Operations
Amateur Radio Activiy on the 630 meter band (Medium Frequency)
The 630M/2200M Antenna Recipe
Antique Radio Forums • View topic - 630 meter (472-479 kHz) Amateur Band
472kHz.org
Lowdown 630-Meter Band Amateur Radio Antenna
630-meter band - Wikipedia
Marconi Antenna for LF/MF
KA7OEI's blog: A transmit converter (and amplifier) for 630 and 2200 meters
Loop Antennas for 630 Meter Transmitting
472kHz.org
AC1CP Amateur Radio Band Plan
2200 and 630 Meters
The 630 - Meter Band: Is it Practical for Amateur Use? on Vimeo
KA7OEI's blog: A transmit converter (and amplifier) for 630 and 2200 meters
630m Transverter
Lowdown 630 Meter Amateur Radio Antenna - 630.PD | eBay
Ham Radio - Get on 630 meters with a bucket variometer! - YouTube
630m Transverter
US Amateur Radio Bands: Frequency Charts
