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Thread: IC-471 Week Signal Modifications

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  1. 09-05-2010, 01:08 AM #1
    WW2L
    WW2L is offline Ham Member
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    Default IC-471 Week Signal Modifications

    Hi Folks,

    I am modifying one of IC-471A for weak signal work. I replaced the all caps with the ceramic ones and 3SK48 on the receiver chain is replaced with the BF981, 2SK125's are also replaced with J310s. When I was checking the circuit I find 2 capacitive diode on the gate of the first amplifier (3SK48) as far as I know this radio does not re-tune the input and it is directly getting it's voltage (which is fix) from R8V point. These two cap-diodes are 1S2090 which very well known with high noise characteristics. Is any one has a good explanation for this diode pair.

    Thanks and 73
    WW2L
  2. 09-05-2010, 01:31 AM #2
    KD8KSN's Avatar
    KD8KSN
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    I think you may have selected the wrong forum. I think you meant this for the "general Q&A forum".
    Zachary N. Beougher

    16"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. 17For God did not send his Son into the world to condemn the world, but to save the world through him."
  3. 09-05-2010, 02:55 AM #3
    WW2L
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    Sorry I was in the impression that I can find more technical people in this forum who knows the IC-471A First RF amplifier. Question looks like simple but it is not.
  4. 09-05-2010, 11:12 AM #4
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    KD8KSN
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    Sorry - didn't mean to scare you away - just thought you might have selected the wrong one. I personally can't help you, but I am sure there is someone here that can.
    Zachary N. Beougher

    16"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. 17For God did not send his Son into the world to condemn the world, but to save the world through him."
  5. 09-13-2010, 07:18 PM #5
    KI8FR
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    That is a very nice radio. I have the 471a and the 271a Love them. My 471a quit txing on me and have not ben able to fix it yet but I will soon.

    What is it that your trying to do to the radio???

    Paul / ki8fr
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