The KCRC TechNet Puzzles For 2023

(Click Here For TechNet Puzzles for 2017)

(Click Here For TechNet Puzzles for 2018)

(Click Here For TechNet Puzzles for 2019-2020)

(Click Here For TechNet Puzzles for 2021)

(Click Here For TechNet Puzzles for 2022)

 

The KCRC TechNet Puzzle for February 8, 2023

A difference of about 700 Hz between Intermediate Frequency and Carrier Insertion Oscillator is needed to receive

A) SSB
B) AM
C) FM
D) Morse.

 

The KCRC TechNet Puzzle for January 25, 2023

If the circuit shown here is inserted in the IF. path of a receiver, it will

A) improve the sensitivity of the receiver
B) remove spikes of interference.
C) decrease the bandwidth of the IF
D) prevent clunk’ in the loudspeaker at switch on

And now for the answer to our January 25 2023 TechNet Puzzle

(It is in “Invisotext” and will be visible if you highlight the area below!)

 

These ‘reverse parallel diodes’ act as a protective circuit, shorting out any voltage higher than the voltage drop designed for these diodes (0.7 Volts for a silicon diode, 0.3 Volts for a germanium diode).

So, the best answer is “B”, removes spikes of interference.

 

The KCRC TechNet Puzzle for January 11, 2023

In which type of semi-conductor does the capacitance vary with changing voltage?

A) Zener
B) FET
C) Germanium
D) Varactor.

And now for the answer to our January 11 2023 TechNet Puzzle

(It is in “Invisotext” and will be visible if you highlight the area below!)

 

Once again, the easiest way to figure out this question is to know what the choices are! A varactor is a variable capacitor diode – its capacitance varies with respect to the reverse voltage applied…

Zener diodes, Field Effect Transistors, and the element germanium don’t have that characteristic.

So, the correct answer is “D” varactor!