# For genius people

#### dakanat

Joined Nov 12, 2008
25
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?

#### hgmjr

Joined Jan 28, 2005
9,029
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

#### beenthere

Joined Apr 20, 2004
15,808
That IF freq should be 455 KHz.

#### dakanat

Joined Nov 12, 2008
25
yes its but i know the anwer
the reson why i but it here bec i am not andersand it

#### hgmjr

Joined Jan 28, 2005
9,029
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

#### dakanat

Joined Nov 12, 2008
25
must be 10.7mhz

#### hgmjr

Joined Jan 28, 2005
9,029
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

#### bertus

Joined Apr 5, 2008
19,952

#### dakanat

Joined Nov 12, 2008
25
thanks for you feddback
but can you give me shor answer for A, B and C

Plz

#### beenthere

Joined Apr 20, 2004
15,808
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.