Many thanks to SWLing Post contributor Dan Greenall, who shares the following guest post and asks, “Wonder who can add to this list?“:

A Look Back – DXing between 1610 and 1700 kHz

by Dan Greenall

1. The Caribbean Beacon, Anguilla West Indies 1610 kHz (1985 QSL)

2. NDB stations (non-directional beacons)

transmitted call letters on CW, mostly from airports, heard in the 1970’s
examples: MDE Medellin, Colombia 1690 kHz and RAB Rabinal, Guatemala 1613 kHz

3. U.S. Army Broadcasting Service KTRK 1670 Fort Meade, MD Feb 1996 articles and recordings

https://www.radioheritage.com/ktrk-k-truck-1670-khz/

4. FCC Part 15 Radio Stations

Example: WDKW 1630 “the Klaw” Dundalk High School near Baltimore, MD

Link to my recording made at a DX camp in Coe Hill, Ontario, Canada on April 20, 1997: https://archive.org/details/wdkw-the-klaw-1630

An internet search revealed the following;

Part 15 of the Federal Communications Commission (FCC) rules allows some low-powered radio devices to operate without a license on the AM and FM radio broadcast bands. These devices are subject to certain restrictions, including:

Range: On FM frequencies, the effective service range is limited to about 200 feet (61 meters).
Field strength: The field strength should not exceed 250 ?V/m (48db) at 3 meters.
Detachable antennas: Part 15 rules prohibit detachable antennas on all Part 15 transmitters.

Some examples of Part 15 radio stations include:

Microbroadcasting

Often used by hobbyists, drive-in theaters, or on college or high school campuses.

Talking roadsigns, talking houses, or talking billboards

These transmitters air a repeating loop of information, such as traffic or highway construction. They typically operate on empty channels on the AM broadcast band.

InfOspot

A custom product that can include special audio systems, USB / internet connectivity, cabinets, and antenna mounting styles.

Free-radiate AM radio stations

Educational institutions can use a transmitter without a license if the signal coverage is limited to their property.

5. TIS (Travellers Information Stations)

1610 kHz with low power, usually around 10 watts, such as the one I hear near the Blue Water Bridge between Sarnia, Ontario and Port Huron, Michigan

6. Expanded AM broadcast band

Over a quarter century ago, these frequencies began to be used in the U.S. by BCB stations. I still have recordings of a half dozen of these from the early days.

WTDY 1670: