"Then you fix up the secondary circuit for adjustment to the wave length, turning it slowly from minimum to maximum until you come to the point where the desired station is heard. When this is found, you again readjust the primary until you find the point of maximum loudness.
"Now you see the advantage of this double control. If an interfering station butts in, just decrease the coupling between primary and secondary and then tune again the two circuits. You can feel pretty sure of cutting out the interference and getting clearly just the station that you want."
"That's mighty good dope," said Bob. "I've had that trouble more than once and haven't been quite clear as to the best way of getting around it."
"Then too," went on the radio expert, "you must be careful in adjusting the tickler that gives the regenerative effect. Start in slowly by turning the control knob toward the maximum. You'll soon strike a point where the signal will be loud and clear. Now when you've got to that point, don't overdo it. If you get too much regeneration, the quality of the notes becomes distorted and before you know it you have only a jumble. Let well enough alone is a good rule in tuning, as in many other things. When your coffee's sweet enough, another spoonful of sugar will only spoil it. Keep to the middle of the road. It isn't the loudest noise you want but the sweetest music.
"Be careful, too," he urged, "not to have too brilliant a filament. It's wholly unnecessary to have it at a white heat, and you don't want to burn it out any more quickly than you have to. You can save money in reducing the filament brightness by increasing the regeneration, which will make up for the loss of brilliancy.
"Now by keeping these things in mind," he concluded, "you'll be able to operate your set to the best advantage and get the satisfaction you are looking for."
"We certainly hope to, anyway," said Bob. "We've put a lot of work and quite a little money into this outfit, and we'd be mightily disappointed if we didn't get good results."
"There's not much doubt about that, I think," remarked Frank Brandon. "You ought to see some of the sets I come across! They look to be regular nightmares, but they get passable results, anyway. Radio is certainly getting to be a country-wide craze. Only the other day I was at one of the big broadcasting stations, and the manager told me that they were actually having trouble to get performers, there is such a demand for them. They seem to be especially hard up for novelty acts--something out of the ordinary. People get tired of the same old programmes night after night."