# For genius people

Discussion in 'Homework Help' started by dakanat, Nov 14, 2008.

1. ### dakanat Thread Starter Member

Nov 12, 2008
25
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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?

2. ### hgmjr Moderator

Jan 28, 2005
9,030
214
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

3. ### beenthere Retired Moderator

Apr 20, 2004
15,815
282
That IF freq should be 455 KHz.

4. ### dakanat Thread Starter Member

Nov 12, 2008
25
0
yes its but i know the anwer
the reson why i but it here bec i am not andersand it

5. ### hgmjr Moderator

Jan 28, 2005
9,030
214
If you can post your work in obtaining the answer then our members can help explain your results.

hgmjr

6. ### dakanat Thread Starter Member

Nov 12, 2008
25
0
must be 10.7mhz

7. ### hgmjr Moderator

Jan 28, 2005
9,030
214
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

Apr 5, 2008
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9. ### dakanat Thread Starter Member

Nov 12, 2008
25
0
thanks for you feddback
but can you give me shor answer for A, B and C

Plz

Apr 5, 2008
15,535
2,302
11. ### beenthere Retired Moderator

Apr 20, 2004
15,815
282
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.