Total posts : 45366
At 1.6 MHz, the radiation resistance of a 3 m vertical antenna is about O.1 ohm, and the capacitive reactance is about 3000 ohms. At 185 kHz, where most of the “Lowfer” activity is, radiation resistance of a 15 m vertical antenna is about 0.04 ohms, with a capacitive reactance of about 7000 ohms. The 1 W input power that is allowed effectively increases the radiation restance to 0.4 ohms. A big loading coil is needed to tune out the antenna capacitance. Ground radials? Forget it. You don’t have the real estate and you can’t afford the copper–miles of copper. Ground rods and cold water pipes at least give you some place to connect the ground lead. Elevated antennas? Well, never mind. Fortunately, the groundwave propagation is better at the lower frequency than in the AM band.
Atmospheric noise is very high at 185 kHz. Summer is hopeless because of the many worldwide lightning strikes. Winter is better.
Forget about AM or SSB. Slow speed Morse code is the mode for Lowfers. Despite the severe limitations of the LF band, contacts of several hundred miles have been reported.