 Gerald Touch invested considerable effort in solving this problem and eventually concluded that a sub @-@ 1 µs transmitter pulse was possible . However , when this was attempted it was found that signals would leak through to the receiver and cause it to be blinded for a period , longer than 1 µs . He developed a solution using a time base generator that both triggered the transmitter pulse as well as cut out the front @-@ end of the receiver , causing it to become far less sensitive during this period . This concept became known as squegging . In extensive tests in Anson K6260 , Touch finally settled on a minimum range of 800 feet ( 240 m ) as the best compromise between visibility and sensitivity . 
