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Astro Spectra P25 receive audio

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deputy13

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I wonder if there is anything that can be done to the ASTRO Spectra to improve the receive audio. The P25 system I monitor is sometimes difficult to understand what they are saying. Is this just the codex in the ASTRO Spectra and I shouldn't expect anything better? I didn't see anything in the software unless I am missing a setting.

ASTRO Spectra CPS R05.03

Host firmware is R10.72.00
DSP firmware is N08.03.05
Flash is: 548008-0004C0-0
 

Notarola

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Check your overall radio alignment. if the referance osc is off freq it can cause the exact symptoms you are describing.
 
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deputy13

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Thanks for the reply. Not sure what reference to adjust in the tuner software. Is there any document besides Motorola's on how to do the adjustments? Only documention I have is for the Spectra not the ASTRO.
 

Magnus

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First you need a service monitor, do you have one? If not take it to your local shop and have them do it.
 
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deputy13

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I have two service monitors and two spectrum analyzers.
 

Magnus

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Good then you will want to adjust the reference oscillator.
 
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deputy13

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I adjusted the reference oscillator using the tuner software. It was about +250 hz. Made the adjustment and audio seems a little better. Thanks.
 

Magnus

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Try running through the TX mod balance and limit, that affects what it expects on RX as well.
 
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deputy13

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Ok didn't realize that function. I followed what was described on this form to set the levels for TX Audio in the CPS software. I'll look at the tuner software and see what I can optomize.
 

Magnus

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Make sure you read the help screens it will tell you what to set the deviation for, 2.83Khz if I recall correctly.
 

JMR061

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The basic service manual contains the full tuning instructions. I haven't looked but my guess is its available on the site. If not contact me I have it in PDF

Jason
 
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