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744
Radio Broadcast
one station can be received with a given heterodyne condenser setting — and hence conversely only one heterodyne condenser setting will bring in a given station — and (3) to use two intermediate frequencies, first a very high one to avoid the complications of tuning that accompany the low "I. F.", then by means of another heterodyne (this one being fixed once for all) changing down to the best frequency for quality and selectivity and amplification. As there are obvious objections to all three courses, it cannot be said that the goal has yet been reached, although the super-heterodyne method, the idea having
the bulk of the receiving set working at fixed frequencies and requiring no tuning adjustments, does not seem capable of improvement. The chief fundamental methods of reception have been outlined but no attempt will be made to discuss all the circuits in use as nearly all are merely combinations of the methods discussed. For example, regeneration can be combined with the neutrodyne type of amplification by putting a variometer in the plate circuit of the detector tube. Again, the fixed frequency receiver of a super-heterodyne set may make use of neutrodyne amplification and reflexing.
Captain Larkin on Radio
CAPTAIN LARKIN, one of the many heroes in "Mr. and Mrs. Haddock Abroad" by Donald Ogden Stewart, finds himself locked in a watertight compartment of his own vessel while showing some of his portly and pompous passengers about the ship. Several of the passengers suggest means of escape, but the suggestion of the Captain himself is by far the most masterly. He, like the Sheriff of Nottingham in "Robin Hood" has brought his "massive brain and eagle eye" to bear, and his solution of the dilemma is radio. The following diagram and conversation are re
THE RADIO DIAGRAM THAT SOLVED THE PROBLEM How to escape from a water-tight bulkhead
produced from the book which is copyrighted by George H. Doran and Company, 1974.
"Well," said the Captain, "my plan rather ingeniously makes use of radio. Have you got a piece of chalk, Mrs. Gerrish?"
"I think so," said Mrs. Gerrish, feeling in her pockets.
"Here's one," said Mrs. Haddock. "Is yellow all right?"
"Yellow will do, I think," said the Captain, and taking the chalk he drew a rather complicated diagram on the side of the wall, somewhat as follows:
"Now," he said, "do you know anything about radio?"
"My son got Pittsburgh one night," said Mr. Haddock, "but there was a lot of static."
"What were they playing?" asked Mrs. Gerrish.
"It was some sort of a jazz band," said Mr. Haddock.
"I like opera best," said Mrs. Gerrish, and she hummed a few of the more important notes from "Faust." "That's from "Rigoletto".
DINING -R00!*! TABLE
HOW TO SELECT A B BATTERY ELIMINATOR
7S THE subject of an interesting article which will appear in an
early number of RADIO BROADCAST. There are many points
to be considered in purchasing and operating a current-tap
device, and this article, written by a radio man of long experience,
will be of great value to prospective purchasers.