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Astro Spectra 800, poor P25 decode

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Anderegg

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Are there any tuning adjustments for the older Astro line 800MHz radios that affect RX and digital decoding? I know tuner says that the RF board comes "pretuned" for RX, and no adjustments are available, but I have heard that certain TX values can affect deviation and other factors in a way that changes the RX.

The Astro Spectra in question is getting broken and choppy P25 decode, even with full RSSI value of 87, when Uniden scanners in the same vehicle are receiving clearly. Analog performance is right where it should be, no sign of problems there. I should mention that this is an inconsistant problem, and that the system being monitored runs frequencies from 856 all the way up to 868.

Thanks!

Paul
 

Anderegg

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It went from 1998 f/w to the latest just recently. Antenna connection is solid, analog is clean and stable. Condition notable due to stationary status and high signal strength.

Radio is an RX only unit, only affiliates, so cannot determine how the TX tuning is performing.

Paul
 

cmdrwill

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The only 'TX Tuning" adjustment is Reference Frequency. That sets the master reference crystal 'on frequency'. If that is not correct then the RX will be off channel.
 

Anderegg

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That sounds like the main vibrating thing that sets the base values for everything.........that is my most technical understanding of that function. Thanks Will, sending the unit out for a proper tuning, only costs around $50 or so. :)

Paul
 
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