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[wxsig] MODEM2 Low TX audio - Fixed

Sct599 at aol.com Sct599 at aol.com
Thu Feb 16 19:36:50 UTC 2006


 
Thanks Joe.  Works great now.
73,
Scott
 
In a message dated 2/15/2006 12:52:41 P.M. Mountain Standard Time,  
wa5vms at tapr.org writes:

Sct599 at aol.com wrote:
> Hello Group:
>  
>  Adding a MODEM2 to my original T238.  I am connecting it to a ICOM   
IC-2100 
> which should work with the separate Mic audio (TX audio)  and  PTT lines 
(not 
> combined like an HT). The PTT and RX audio  are working properly.  My TX 
audio is 
> very low even with  adjusting V100.  The audio does change  with V100 
>  adjustment but is still too low when even at max.  In my   troubleshooting 
of the audio 
> path I have noticed two  things....
>  
> 1. R101 is shown as a 10K on the schematic.  However, the instruction 
manual  
> and parts list calls for a  100K.  A 100K was provided and is what I  have 
> installed. I  jumpered past R101 and the audio did indeed increase but not  
to an  
> acceptable level. What value should R101 be?
Change it to a 4.7 K  and the output coupling capacitor from 100 pf to a 
.1 uf.

This  should solve your problems.

Joe
>  
> 2. V100 is  supposed to be oriented on the board to match the  
silkscreening.   
> However, if you do so, the leads are not oriented   properly.  I reversed 
V100 
> from the silkscreening to match the  lead  arrangement and the photo at 
>  _http://beals5.com/wx/index.htm_ (http://beals5.com/wx/index.htm)   under  
"How to 
> build a T238+"  Does the orientation of V100  make a  difference?
>  
> Any other ideas?
>   
> 73,
> Scott
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