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Pro-96 not decoding XTS 3K Astro audio
Posted: Fri Aug 10, 2007 6:58 pm
by Logitec
Trying to set up a VHF XTS 3K for P-25 HAM use. When I TX in Astro mode, my Pro-96 scanner (I know, bad way to test) does not decode any audio. It switches to digital mode but decodes no audio (silent).
At the moment I have no other way to test (no other radios on same band or service monitor). Next week I will have access to advanced equipment, but just impatient right now.
Could this be an alignment problem (thought it was aligned OK) or a programming problem? Thanks.
Re: Pro-96 not decoding XTS 3K Astro audio
Posted: Fri Aug 10, 2007 8:03 pm
by Logitec
FYI, it's not some of the obvious:
XTS is not secure equipped and I tried moving the Pro-96 very far away to prevent overload of the cheap receiver.
Re: Pro-96 not decoding XTS 3K Astro audio
Posted: Fri Aug 10, 2007 8:37 pm
by n7maq
Logitec wrote:Trying to set up a VHF XTS 3K for P-25 HAM use. When I TX in Astro mode, my Pro-96 scanner (I know, bad way to test) does not decode any audio. It switches to digital mode but decodes no audio (silent).
At the moment I have no other way to test (no other radios on same band or service monitor). Next week I will have access to advanced equipment, but just impatient right now.
Could this be an alignment problem (thought it was aligned OK) or a programming problem? Thanks.
I would look at the alignment. The TX balance may be off.
Jim
Re: Pro-96 not decoding XTS 3K Astro audio
Posted: Sat Aug 11, 2007 9:35 am
by Logitec
More info:
If I go to the Service Menu in RSS and under Transmitter Test Patterns, have it generate a P-25 1011 Hz Test Tone, that comes through fine on the Pro-96 (in digital decode mode). That must mean the alingment is, at least, reasonable, right?
But just speaking into the Mic, it's like it's not modulating the P-25 signal with voice. Analog Modulation is fine. Could the radio have a problem that would cause no TX audio, just for Astro? Or could this still be something in programming? I've tried many different settings and no change.
Re: Pro-96 not decoding XTS 3K Astro audio
Posted: Sat Aug 11, 2007 10:05 am
by n7maq
Logitec wrote:More info:
If I go to the Service Menu in RSS and under Transmitter Test Patterns, have it generate a P-25 1011 Hz Test Tone, that comes through fine on the Pro-96 (in digital decode mode). That must mean the alingment is, at least, reasonable, right?
But just speaking into the Mic, it's like it's not modulating the P-25 signal with voice. Analog Modulation is fine. Could the radio have a problem that would cause no TX audio, just for Astro? Or could this still be something in programming? I've tried many different settings and no change.
You need a service monitor, sorry. With out one, you will most likely make it worse. With digital, the alignment needs to be right on, not close. I would wait till you get the monitor next week.
Also it could be you are just overloading the PRO-96's RX if you are to close. Have you tried from a few feet away, on low TX power?
If you are going to use it for ham use, drop me a PM if you can't get it going and I'll be glad to help you out if I can. I try to promote P25 use on the ham bands as much as I can. I have mixed mode Quantars on both 2, and 440.
Jim
Re: Pro-96 not decoding XTS 3K Astro audio
Posted: Sat Aug 11, 2007 11:43 am
by Logitec
n7maq wrote:Logitec wrote:More info:
If I go to the Service Menu in RSS and under Transmitter Test Patterns, have it generate a P-25 1011 Hz Test Tone, that comes through fine on the Pro-96 (in digital decode mode). That must mean the alingment is, at least, reasonable, right?
But just speaking into the Mic, it's like it's not modulating the P-25 signal with voice. Analog Modulation is fine. Could the radio have a problem that would cause no TX audio, just for Astro? Or could this still be something in programming? I've tried many different settings and no change.
You need a service monitor, sorry. With out one, you will most likely make it worse. With digital, the alignment needs to be right on, not close. I would wait till you get the monitor next week.
That's my plan. I haven't changed any alignment settings without a service monitor.
Also it could be you are just overloading the PRO-96's RX if you are to close. Have you tried from a few feet away, on low TX power?
Have tried low power and very far away.
If you are going to use it for ham use, drop me a PM if you can't get it going and I'll be glad to help you out if I can. I try to promote P25 use on the ham bands as much as I can. I have mixed mode Quantars on both 2, and 440.
Jim
It is for Ham use and thanks.
Re: Pro-96 not decoding XTS 3K Astro audio
Posted: Tue Aug 21, 2007 9:33 pm
by Logitec
Forgot to post last week, but this was an alignment problem with the Deviation Balance. Works great now. Thanks for the help.