AOP exam 1927 transcript VK7AG

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7AG       A.O.P. Exam      7/4/27

Theory
Define 
Kelvin
Electro-static induction
Henry
Impedance
2 	How would you adjust a low power transmitter to obtain maximum efficiency in connection with the following:
a) Accuracy of frequency
b) Power radiated from antenna
c) Power input to anode cct.
State advantages and disadvantages of following Xmitting ccts
1 Hartley  2 Meisner  (sic)  3 Colpitts
Which do you prefer and why?
Explain the theory of the super-het cct. & give reasons for its design

Discuss merits and demerits of foll. Systems of Xmission
3rd harmonic  b) Fundamental

State what you know about Piezo-electric effect

In establishing a low power radiophone installation Heising system how would you decide the following
Relation between modulation and oscillator power
System of plate supply
System of filament supply
Give diagram where necessary


7AG       A.O.P. Exam      7/4/27


Define the classes of stations that xperimenters are permitted to communicate with

Give an example of a message of not more that 20 words. Show the preamble, text and signature and include the correct position of the necessary break signs.

If it is necessary to communicate with a station whose call you do not know, what sigs would you make.


State fully the classes of traffic that experimental stations are permitted to handle.

Indicate the meaning of the following characters
_ … _          _._ _._        _.._ .        …_._

What is the correct form of acknowledging the receipt of a message?

What action do you consider necessary for a licenced experimenter to take in order to co-operate with the Department in the inspection of his station?