What Use Is An F-call?

What use is an F-call? When you operate your station on a regular basis you might find yourself lulled into the belief that all is well with the world and that your station will continue to operate as expected. It worked yesterday, so why wouldn't it work today - nothing changed. Having now operated my station for several years and having been granted the opportunity to operate stations built and maintained by others I can categorically state that nothing stays the same, ever. In fact, it's probably better to work on the assumption that your station is changing all the time, that it's different than it was yesterday and even different than it was an hour ago. This variation is the result of a number of things that affect the operation of your station. The weather is an obvious influence. Antennas are subject to the wind, the rain and the sun, not to mention lightning and atmospheric ionisation. But the weather is not the only variable. Power supplies are fed by the grid which fluctuates, power supplies h