[time-nuts] Maser 0.7 nsec jumps solved

al wolfe alw.k9si at gmail.com
Thu May 26 16:58:21 EDT 2016


Maybe the simplest solution would be to try a rudimentary form of
step-start relay to crank the A/C compressor. This used to be quite
common before the days of VFD's and such.

The regular start relay applies power to the motor via a resistor that
limits inrush current to some safe level to start the motor turning.
When the motor reaches a certain speed the voltage across the resistor
drops enough that a relay down stream of the resistor picks up and
shorts out the resistor applying full voltage to the compressor.

This method was used in many motor circuits, several broadcast
transmitters, and some ham radio amplifiers. Some applications use a
timer to energize the second relay. And, of course, there needs to be
some precaution paid to deal with a locked rotor.

Al, aka k9si


More information about the time-nuts mailing list