[AMRadio] Apache

[russ dworakowski]

Charlie,  look at the drawing,  you  can't  get around the  clipping in an 
Apache.  The signal always  goes  thru  the  6AL5,  so  distortion
is always introduced,  unless you remove  or  bypass this  stage,  of
course if  you adjust  it  carefully,  it will work OK.  rewiring  the
speech amp like a DX-100  gets  you  what you need.  Russ


>From: "Charlie Solie" <WB5LHV at zianet.com>
>Reply-To: amradio at mailman.qth.net
>To: <amradio at mailman.qth.net>
>Subject: [AMRadio] Apache
>Date: Sun, 14 Apr 2002 20:40:29 -0600
>
>Pete is right about the Apache audio adjustments.  For those who might not 
>have a manual, I have put a copy of page 7 at:
>
>http://www.zianet.com/WB5LHV/page7.gif
>
>I have also made a block diagram of the system that should help folks 
>understand the problem.  Both pots control the audio gain and if the level 
>control is set high enough, the clipper will not do much if anything.
>
>http://www.zianet.com/WB5LHV/ablock.gif
>
>Note that R48 can be disconnected if you need higher audio input impedance.
>
>I would like to, but have not tried the negative feedback.  Unfortunately, 
>what has been described does not include all of the audio stages.  I wonder 
>if the feed back point could be move toward the input?
>
>73,
>
>Charlie
>
>
>
>
>
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