Batboard

Posted: **Wed May 28, 2008 2:58 pm**

Hi all!

I have purchased XTS2500 (H46QDH9PW7BN) from Panter88.

It works fine in analog mode and in digital on RX. But this one has problems with digital transmissions. When I receive transmissions on another XTS2500 (brand new), it practically always is silent (no demodulated sound). Uniden BCD996T only sometimes demodulates transmissions, but as a rule only clicks. Astro Saber demodulates it is most, but thus the voice has distortions or demodulation process breaks in AAAAAAAAAAAA......

As a result of experiments I have find out, that my control receivers can successfully demodulate only on transmissions from 453..467 MHz range (I tried 403..470 range with 5 MHz step). By transmissions on other frequencies all my digital receivers practically always is silent.

Another XTS2500 (brand new) behaves on another - transmissions on any frequencies in 403..470 range demodulates with 100% cleanliness.

What is it? Non-aligned (aka blanked) XTS2500? :(

How I can fix it? Using a ASTRO 25 Tuner?

Current alignment data:

Code: Select all

 Serial No: 123ABC1234, Model Num: H46QDH9PW7BN
   -----------------------------------------------------
   Reference Oscillator        
   -----------------------------------------------------        
   Frequency        Softpot        
    469.6500        209
   -----------------------------------------------------
   Tx Power High        
   -----------------------------------------------------        
   Frequency        Softpot        
    380.0250        77
    395.0250        82
    409.9000        87
    424.8500        90
    438.1500        91
    444.0500        92
    456.3500        93
    463.7000        95
    469.6500        96
   -----------------------------------------------------
   Tx Power Mid        
   -----------------------------------------------------        
   Frequency        Softpot        
    380.0250        47
    395.0250        47
    409.9000        47
    424.8500        47
    438.1500        47
    444.0500        47
    456.3500        47
    463.7000        47
    469.6500        47
   -----------------------------------------------------
   Tx Power Low        
   -----------------------------------------------------        
   Frequency        Softpot        
    380.0250        47
    395.0250        47
    409.9000        47
    424.8500        47
    438.1500        49
    444.0500        47
    456.3500        47
    463.7000        47
    469.6500        47
   -----------------------------------------------------
   Tx Deviation Balance        
   -----------------------------------------------------        
   Frequency        Softpot        
    380.0250        48
    395.0250        51
    409.9000        53
    424.8500        28
    438.1500        44
    444.0500        47
    456.3500        22
    463.7000        20
    469.6500        40
   -----------------------------------------------------
   Tx Deviation Limit        
   -----------------------------------------------------        
   Frequency        Softpot        
    380.0250        23182
    395.0250        23182
    409.9000        23182
    424.8500        23182
    438.1500        23182
    444.0500        23182
    456.3500        23182
    463.7000        16620
    469.6500        23182
   -----------------------------------------------------
   Rx Front End Filter        
   -----------------------------------------------------        
   Frequency        Softpot        
    380.0750        19
    395.0750        35
    409.9500        46
    424.9000        56
    438.2000        69
    444.1000        75
    456.4000        79
    463.7500        82
    469.7000        106
   -----------------------------------------------------
   Battery Calibration        
   Battery Reading        
   Batt Cal        130

How you think, which of parameters can be responsible for it?

Any other ideas?

Any help will be appreciated!

Posted: **Wed May 28, 2008 4:34 pm**

Incomplete alignment. The radio needs a full alignment with a service monitor, using the Astro 25 Tuner.

Posted: **Thu May 29, 2008 5:54 am**

tvsjr wrote:Incomplete alignment. The radio needs a full alignment with a service monitor, using the Astro 25 Tuner.

Thank you!

Whether it is possible fix it, having made alignment on the service monitor without P25 support?

Posted: **Mon Jun 23, 2008 8:19 pm**

The alignment issue is completely fixable via the tuner software and a good calibrated service monitor. I have ordered two of these radios and they had the same issue. These are incomplete 'blank' radios with just a basic load and some starting point tuning to get them to pass an initial go/no-go test.

After full alignment, I double checked the BER and other P25 issues and the radios worked just as well as my factory XTS I bought last year. Except I could have bought 3 Panter radios for what I paid for my XTS2500 FPP.

Posted: **Tue Jun 24, 2008 11:38 am**

com501 wrote:The alignment issue is completely fixable via the tuner software and a good calibrated service monitor. I have ordered two of these radios and they had the same issue. These are incomplete 'blank' radios with just a basic load and some starting point tuning to get them to pass an initial go/no-go test.

After full alignment, I double checked the BER and other P25 issues and the radios worked just as well as my factory XTS I bought last year. Except I could have bought 3 Panter radios for what I paid for my XTS2500 FPP.

Ok, thank you!

Posted: **Fri Aug 21, 2009 6:48 am**

To answer the original question, Tx Deviation balance more than anything else. Of course a full alignment will fix this like the other guys have said.

Notice how it works from 453-467Mhz, and these are the settings that correspond to softpot values 22 and 20 while the others are all like 40+ (except 424 - I suspect the radio might work there too)

Code: Select all

   -----------------------------------------------------
   Tx Deviation Balance       
   -----------------------------------------------------       
   Frequency        Softpot       
    380.0250        48
    395.0250        51
    409.9000        53
    424.8500        28
    438.1500        44
    444.0500        47
    456.3500        22
    463.7000        20
    469.6500        40

Posted: **Fri Aug 21, 2009 7:58 am**

MotoFAN wrote:
tvsjr wrote:Incomplete alignment. The radio needs a full alignment with a service monitor, using the Astro 25 Tuner.
Thank you!

Whether it is possible fix it, having made alignment on the service monitor without P25 support?

Using a P25 monitor is beyond overkill. The digital tuning adjustments are relative to the analog softpots. You will need a monitor that can display frequency error, generate RF and tones, spectrum analyzer and oscilloscope. Internal watt meter is nice but not required. It's pretty neat that a $500 8924C tunes the 5k just as well as a brand new monitor costing 70 times that...

Batboard

Problem with XTS2500. Alignment issue?

Problem with XTS2500. Alignment issue?

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