500 kHz - Wikipedia
KA7OEI's blog: A transmit converter (and amplifier) for 630 and 2200 meters
Ham Radio - Get on 630 meters with a bucket variometer! - YouTube
The 630 - Meter Band: Is it Practical for Amateur Use? on Vimeo
The 630M/2200M Antenna Recipe
Notification Process for 630 and 2200 Meter band Operation – N4BFR Vision
Lowdown 630-Meter Band Amateur Radio Antenna
Getting Started on 630 metres
630-meter Ham Band | A Ham Radio Band below the AM Broadcast Band - YouTube
630 Meters | W0QL – My Remote Base Journal
630-meter band - Wikipedia
A Portable QRP CW Amateur Transceiver for 475 KHZ 630 Meter - Etsy
FCC Opens 630/2200 Meters Amateur Band; Pre-Registration Required!
N2KNL | Band Plan
Casella CEL 630.A Type 2 Ultra Wide Octave Band Sound Level Meter Kit
472kHz.org
Antique Radio Forums • View topic - 630 meter (472-479 kHz) Amateur Band
472kHz.org
Hams Map Powerlines for Low Frequency Interference | QRZ Forums
Getting Started on 630 metres
Lowdown 630 Meter Amateur Radio Antenna - 630.PD | eBay
