Hi folks! According to the Hammarlund instruction book, the clock on the HQ radio was intended to warm up the radio 30 minutes before it's scheduled use. HQ Frequency stability is a problem for about 10-20 minuites during warm up. Both of my HQ clocks worked, but the timer springs were both broken, and the radio's "automatic turn on" feature would not operate. 73's mike kd5vVa