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Radio Broadcast
a certain sized condenser was designated to tune a circuit to a predetermined wavelength range.
In the article it was mentioned that the chart might be used in the reverse manner, where the coil size and wavelength range desired were known, to determine the value of variable condenser needed to accomplish this end.
In detail this reverse operation is described as follows:
Count the number of turns per inch on the coil and measure its length. On the chart connect these two points by a pencil line. Then determine the diameter of the coil and at that value on the chart and draw a line to intersect with the one previously drawn, at the index line and at the inductance scale.
Then by knowing the inductance value, since it
is indicated by where this last line touches the inductance scale, and by knowing the maximum wavelength range desired, we draw a line between these two points and continue the line on to the capacity scale. This intersection at the capacity scale gives us the maximum capacity of the variable condenser necessary for tuning the coil in question to the maximum wavelength indicated.
CORRECTED DIMENSIONS
THE dimensions for the panel used in the construction of the two-stage radio-frequency amplifier described in the May, 1925, issue of Radio Broadcast Magazine should read as follows: Panel 7 inches wide, 18 inches long, and. x¥ inch thick.
Before You Write to the Grid
THOUSANDS of you are writing the Grid for technical advice every month. The expense of framing a complete and exhaustive reply to each letter is very high. The editors have decided that the benefit of the questions and answers service will continue to be extended to regular subscribers, but that non-subscribers, from April 15, on, will be charged a fee of $1 for each letter of inquiry which they send to our technical department. Very frequently, our technical information service proves of definite money value to you who write us, for we are often able by a sentence or two of explanation, to put you on the right path before you have made a perhaps expensive mistake.
The occasional reader of Radio Broadcast will be charged a fee of $1 for complete reply to his questions, and the regular subscriber can continue to take advantage of the service as before. In that way the non-subscriber will help share the cost of the technical staff whose service he gets. Every letter receives the benefit of the experience of the editor and the technical staff and every correspondent may be sure that his questions will receive careful consideration and reply.
When writing to the Grid, please use the blank printed below.
GRID INQUIRY BLANK
Editor, The Grid,
Radio Broadcast,
Garden City, Njew Tor\.
Dear Sir:
Attached please find a sheet containing questions upon which \indly give me fullest possible information. 1 enclose a stamped return envelope.
(Chec\ the proper square) O I am a subscriber to Radio Broadcast. Information is to be supplied to me free of charge.
D I dm not a subscriber. I enclose $1 to cover costs of a letter answering my questions.
}Ay name is : —
hiy address is —