Hendricks BITX20A AGC, S-meter Mod
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
I'd check with these folks and see what they have to say;
Hope this helps
One of the great things about the BitX20 is that there is a discussion group for BitX20 builders located at http://groups.yahoo.com/group/BITX20
. This group not only provides help for those building BitX20's, but also provides discussion about modifications.
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/imp...-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_R...sign_Ideas.htm. Loads of stuff there.
Hope this helps.
Last edited by KO6WB; 10-25-2012 at 02:38 PM.
Thanks for all the great resonses guys!
They are a geat help.
73, Ken AD6KA