[App_rpt] Hot TX audio

[hwstar at rodgers.sdcoxmail.com]

Use an 'L' network made out of 2 resistors. Start with 68 kohms for the top resistor, and 470 ohms for the bottom resistor. Feed the output output from the fob to the top resistor, and take the audio at the tap for the microphone input. Connect the bottom of the 470 ohm resistor to mic ground.

There's no standard for microphone sensitivity across radios. It varies all over the place from a few millivolts
P-P to a volt P-P or so.

If you are willing to tear the radio apart, you could inject
the USB fob output right into the modulator of the radio. This will provide the best signal to noise ratio. This is what I prefer to do.

Steve
WA6ZFT
> 
> From: Steven Palm <n9yty at n9yty.com>
> Date: 2008/07/14 Mon PM 01:07:24 PDT
> To: Asterisk Repeater Controler <app_rpt at lists.illiana.net>
> Subject: [App_rpt] Hot TX audio
> 
> Hi all,
> 
> Just fishing for ideas...  I have my app_rpt node connected to a radio  
> right now via the mic input, and the audio is HOT.  Using the 'radio  
> tune txvoice' command, I get no audioble ouput when using a number  
> below 27, but anything over 50 or so drives the radio way way wide in  
> deviation and starts clipping.
> 
> I'm assuming that the parameter here is adjusting the volume on the  
> USB sound fob, and it's just too much for the rig...  Thinking a  
> resistor in the TX audio line would do it, any suggested for a  
> size? :)  Then I can run over to Radio Shack and pay them $3.95 for an  
> $0.18 resistor. LoL
> 
> Steve
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