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In the Yahoo Rangemaster Users’ Group (linked on the am1000rangemaster.com website), on the topic of 1710 kHz, Hamilton said that 1710 kHz is governed by a different set of rules from 15.219. This would be Section 15.223, which covers 1705 kHz to 10 MHz. The field strength limit is 15 uV/m at 30 m, which really gives a range of less than 30 m (more like 20 feet, actually). In most urban environments, the field strength can’t even be measured at the distance specified. The only licensed service that I know of on 1710 kHz is TIS.
If you have a field strength meter, you may be able to operate your Rangemaster legally on 1710 kHz by detuning it to the extent that it meets the 15.223 field strength limit. On 1610 kHz, even an inefficient installation should be able to legally get 1500 uV/m at 30 m; about 100 times the 15.223 limit.