Hendricks BITX20A AGC, S-meter Mod

Discussion in 'Homebrew and Kit Projects' started by AD6KA, Oct 24, 2012.

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  1. AD6KA

    AD6KA Ham Member QRZ Page

    Hello Builders!

    I have been looking all over for an actual schematic
    for a HENDRICKS BITX20 AGC Mod. I get lots of
    hits about people who say they added the AGC
    Mod, S-Meter Mod, etc, but they contain no other
    information other than "I did this Mod".

    I would also like to add an inexpensive S-Meter. The only
    actual schematic I found was for a 5 segment LED
    bar graph. A good start (and a fall back plan)
    but I would prefer an analog meter if possible.
    Again.....I have seen photos and You Tube videos
    of units with a CB type S Meter added but no other info.

    Anybody done these mods or seen a schematic?
    It would really make my day.
    TNX ES 73, Ken AD6KA
    kenp <AT> socal.rr.com
  2. KO6WB

    KO6WB Premium Subscriber QRZ Page

    I'd check with these folks and see what they have to say;
    Hope this helps
  3. KO6WB

    KO6WB Premium Subscriber QRZ Page

    I did some more digging and found somethings that might be helpful. There's a description of a s-meter circuit here; http://n8wq.blogspot.com/2012/04/improved-neophyte-receiver-part-2-i.html.
    This is the schematic for it;


    Another one here; http://www.southgatearc.org/qrp/audiometer.htm.


    If you look at how they derive their signals and how they control and amplify the signal these circuits are almost identical.
    And one that actually uses a couple of IC's and yes you can still get them. You may only need the circuitry from C5 on.


    I'm sure if you wanted to find other circuits doing an internet search will net you a number of them.
    Got this one from this site; http://www.qsl.net/va3iul/Homebrew_RF_Circuit_Design_Ideas/Homebrew_RF_Circuit_Design_Ideas.htm. Loads of stuff there.
    Hope this helps.
    Have fun
    Last edited: Oct 25, 2012
  4. AD6KA

    AD6KA Ham Member QRZ Page

    Thanks for all the great resonses guys!
    They are a geat help.
    73, Ken AD6KA
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