[App_rpt-users] audio level

[Tim Sawyer]

The audio set up procedure has you calibrate the RX level so that every node across the entire Allstar network produces the same level audio for 3kHz dev. This is the reason Allstar audio levels do not vary all over the road like some other VoIP networks. For this reason it’s best to not ’tweak’ the RX level away from the recommended setup. 

If after you have your RX and TX levels set per procedure, you still feel the TX it too low, then ‘tweak’ your TX side. But please don’t mess with the RX as that can impact the overall excellent performance of the Allstar network.

One thing to mention here is preemphasis and deemphasis. That’s a whole other topic, a complex topic. Just sure you understand the issue and have both of those correct or you may be thinking you have a level problem when what you actually have is a frequency response problem.  
--
Tim WD6AWP

> On Aug 29, 2014, at 3:05 PM, Ken <ke2n at cs.com> wrote:
> 
> "When I set my repeater up I used the automated method with a calibrated
> service monitor.  I noticed it called for 3 kHz of audio. Finally got the
> repeater on the air and the audio is a little soft compared what I'm used
> to. I know I can adjust it but I assume this is done for a reason to keep
> all of the repeaters sounding close to each other. 
> Any thoughts?"
> 
> The calibration routine gives you a test audio level that corresponds to 3
> kHz deviation. Full scale deviation will be 5 kHz.  The lower level is used
> (I imagine) to avoid running up against any limiter effect during that
> calibration step.
> 
> If you really need more deviation then adjust for more than 3 at that step
> in the procedure.  Of course, then you will get more than 5 on peaks. This
> is the case when you are feeding the audio right into the modulator stage.
> 
> If you are using "mic audio" then the limiter built into in your transmit
> radio will be affecting the deviation of the transmitted audio. You need to
> find and adjust that. Or inject the audio in a different place where the
> radio's limiter does not take effect.
> 
> 73/GL
> Ken
> KE2N
> 
> 
> 
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