Element 3: General Radiotelephone

effective 6/25/2009

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3-F-047: Filters

3-47F1: A good crystal band-pass filter for a single-sideband phone would be?

2.1 KHz.

5 KHz.

500 Hz.

15 KHz.



Figure 3F16

3-47F2: Which statement is true regarding the filter output characteristics shown in Figure 3F16?

A is a low pass curve and D is a band stop curve.

C is a low pass curve and B is a band pass curve.

B is a high pass curve and D is a low pass curve.

A is a high pass curve and B is a low pass curve.



3-47F3: What are the three general groupings of filters?

High-pass, low-pass and band-pass.

Inductive, capacitive and resistive.

Audio, radio and capacitive.

Hartley, Colpitts and Pierce.



3-47F4: What is an m-derived filter?

A filter that uses a trap to attenuate undesired frequencies too near cutoff for a constant-k filter.

A filter whose input impedance varies widely over the design bandwidth.

A filter whose product of the series- and shunt-element impedances is a constant for all frequencies.

A filter whose schematic shape is the letter “M”.



3-47F5: What is an advantage of a constant-k filter?

It has high attenuation of signals at frequencies far removed from the pass band.

It can match impedances over a wide range of frequencies.

It uses elliptic functions.

The ratio of the cutoff frequency to the trap frequency can be varied.



3-47F6: What are the distinguishing features of a Butterworth filter?

It has a maximally flat response over its passband.

A filter whose product of the series- and shunt-element impedances is a constant for all frequencies.

It only requires capacitors.

It requires only inductors.





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