[AMRadio] re: Apache audio not good

[russ dworakowski]

Hey folks,  the  control behind  the  key jack is  not a limiter, it
adjusts  the  clipping  level!  You  will find  2 or 3  coupling  caps
in  the speech amp  that are  500 pf,  these  need to be  removed  and  
replaced  with  .01 to  .05  uf  coupling  caps.  The  biggest  bang
for the  buck  improvement  comes  with  installing  a negative   feedback 
loop from  the  mod.  trans.  secondary [500 ohm tap]  to
the  cathode of  the  12BY7 driver tube.  Ask  and  I will send  more  
details.  Russ

>From: Jordan Arndt <jordana at nucleus.com>
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: Re: [AMRadio] re: Apache audio not good
>Date: Tue, 09 Apr 2002 10:47:50 -0600
>
>Ron... there is an audio limiter pot located inside the rig... I believe it 
>is adjustable through the key jack (?)... it is usually the reason the rigs 
>were called " Scratchy Apache".. it is usually set for too much limiting... 
>73 de Jordan...
>
>Ron Samchuk wrote:
>
> > Hi again...
> >     Thanks for all the advice and suggestions received so far concerning 
>the Apache and Mohawk.  I had one person asking me to be more specific on 
>what I was prepared to do.  I don't want to make major changes or 
>modifications, but simply have a good signal with acceptable AM audio.
> >     For example, I used the Apache last night... power output was fine, 
>everything loaded up OK, but I could tell on the scope that the pattern was 
>not good.  It looked like vertical scratches rather than a nice envelope.  
>Contacts tried to be nice, but did say it sounded very much on the high 
>frequency side, with one person saying that he could receive me better on 
>ssb setting.  The microphone used here is an amplified D-104; being careful 
>not to have too much audio gain.  Something I have not done is grounded the 
>rigs so there is a possibility of course that perhaps rf is getting into 
>the audio.
> >     So any suggestions as to what to check or mods would be appreciated. 
>  Thanks in adance for any comments.  Ron VE4SR (VE4 Super Rabbit)
> >
> > --- StripMime Report -- processed MIME parts ---
> > multipart/alternative
> >   text/plain (text body -- kept)
> >   text/html
> > ---
> > _______________________________________________
> > AMRadio mailing list
> > AMRadio at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/amradio
>
>_______________________________________________
>AMRadio mailing list
>AMRadio at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/amradio


_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com