The super-heterodyne receiver has an IF of 470 kHz for AM and is tuned between the following frequency range 500 kHz – 1500 kHz.
· What would be the range of frequencies must the Local Oscillator cover.
· what would be an acceptable bandwidth for the IF amplifiers.
What would the effect be on a selected signal, if the bandwidth were twice as large as necessary?

 

Is this question related to school work?

If so, then let me know and I will move it to the "Homework" section where it belongs.

hgmjr

 

That IF freq should be 455 KHz.

 

yes its but i know the anwer
the reson why i but it here bec i am not andersand it

 

yes its but i know the anwer
the reson why i but it here bec i am not andersand it

If you can post your work in obtaining the answer then our members can help explain your results.

hgmjr

 

must be 10.7mhz

 

As I recall, 10.7 MHz is the IF associated with FM. Your original post indicated that your question was about AM. If AM is the subject, then beenthere is correct. The AM IF frequency is most often 455 KHz.

hgmjr

 

Hello,

For AM 455 kHz, 462 kHz and 470 kHz are used as IF frequency.
As hgmjr said 455 kHz is most common.
More information can be found in the links of this page of the EDUCYPEDIA.

http://www.educypedia.be/electronics/radiotuning.htm

Greetings,
Bertus

 

thanks for you feddback
but can you give me shor answer for A, B and C

Plz

 

Hello,

Most of the answers you can find in the links I gave you.
A :
http://www.mikroe.com/en/books/rrbook/chapter4/chapter4a.htm
B:
http://www.tokoam.com/passives/filters/ceramic/index.html
Take a look at the datasheets.
C:
If the IF is to broad , stations next to it will disturb the signal.

Greetings,
Bertus

 

One problem with the specs given is that no figure for station bandwidth is given. The IF response is necessarily tailored to the signal bandwidth.

Bertus' link give the information necessary to figure the local oscillator frequency.