what is the acronym "IF"?

Discussion in 'General Electronics Chat' started by strantor, Jul 24, 2011.

  1. strantor

    Thread Starter AAC Fanatic!

    Oct 3, 2010
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    refer to this datasheet. page 53, the descriptions for:
    VREFTOP
    AVSS
    AVSUP
    ANA_IN1+
    ANA_IN-
    ANA_IN2+
    and in several locations throughout this datasheet refer to IF. What is it?
    I've scoured the datasheet and can't find a definition and google only returns "If" statements in programming languages.

    thanks!
     
  2. cjdelphi

    New Member

    Mar 26, 2009
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    IF forward current?
     
  3. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    IF stands for Intermediate Frequency.
    from page 11:

    Bertus
     
  4. KJ6EAD

    Senior Member

    Apr 30, 2011
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  5. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
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    Let start with some basic view:-

    Two types of radio receivers were invented Tune Freq. was the first in which there was some disadvantages like quality factor,etc....
    then come IF which is called Intermediate freq. in this Receiver the received freq. is lowered by a oscillator called local Oscillator in receivers. the overall freq. is now less than received.

    Why should we bother of low freq.??

    B'coz low freq. can be easily handle than high freq. nowadays almost all receivers have build in local oscillator which is tuned with Gang called Variable capacitor.
    the disadvantage of Tune receivers can be over come but the DE-merit of this receivers is Image Freq. ( something like this) .......

    E.G.:- FM receivers, LNB in DTH ( low noise block called Feed horn) you can see the circuit in feed horn which converts GHZ freq. to MHz ( 9750 or 5150Mhz)

    Google for more Explanation.
     
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  6. bertus

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  7. gootee

    Senior Member

    Apr 24, 2007
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    Using an IF is also nice because from the IF-conversion point onward in a receiver the frequencies are always the same, and it's MUCH easier to design things for a fixed frequency that's known in advance.
     
  8. Jaguarjoe

    Active Member

    Apr 7, 2010
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    TRF, or tuned radio frequency radios were probably first on the scene. The one I remember had 3 different tuning dials.
    Regenerative sets were probably next in line.
    Superheterodyne receivers were the latest developement (until IC's came along). The AC/DC "All American 5" mixed the incoming 550khz-1600khz signal with a higher frequency local oscillator. The resultant 455khz IF frequency was then amplified and processed into audio. FM receivers were the same way except their IF frequency was 10.7 mhz. Because they only had one mixer, these were called single conversion radios. My big old Hallicrafters shortwave radio was double conversion. The first IF frequency was 10.7mhz and the second IF frequency was 455khz.

    My all time favorite radios were my 1A5 grid leak detector receiver made in a cigar box and a 12AT7 super-regen aircraft receiver.
     
  9. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
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    what is this....??
    I have seen up loader video/channel in you tube ....
     
  10. Jaguarjoe

    Active Member

    Apr 7, 2010
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    An "All American 5" is a slang name for 5 tube (or valve) AM band superhet radio receiver that was line powered with no isolation transformer.

    12BE6 mixer
    12BA6 IF amp
    12AV6 detector/1st audio
    50C5 audio output
    35W4 half wave rectifier

    There were so many models of this type made by so many manufacturers they could quickly and easily be repaired because the technician had pretty much memorized the basic schematic. After doing a few hundred it begins to sink in. Kinda sorta like knowing what pins 2,3,4,6, and 7 are on an op-amp.
     
    Last edited: Jul 25, 2011
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