New to UniTrunker

[mike_s104]

I just tapped my 996T and set up UniTrunker. The system I want to monitor is P25 450-460MHz (http://www.radioreference.com/apps/db/?sid=4076). The quality level does not go above 22%, but when monitor another P25 system but 800MHz, the quality level goes to 90-99%.

In reading, I discovered that I could use my PRO-2006 that I tapped LONG ago to use a Universal M-400 decoder (and I am an idiot because I didn't need to mod my 996T, which I think I messed up the green backlight somehow and that I could have been using UniTrunker for years now). With the PRO-2006, the quality level goes up to 75-99%.

What am I doing wrong with the 996T? NO, (I know, I know) I did not install a tantalum cap or resistor inline with the tap. I think on the PRO-2006, the center is soldered to one end of a resistor.

 

[crayon]

In amongst all of your testing, are you using the same cable? Some cables are attenuating ...

 

[mike_s104]

In amongst all of your testing, are you using the same cable? Some cables are attenuating ...

Thanks for the quick reply.

No, it's not an attenuated cable. I just tried it with the PRO-2006 and its the same. I just tried the 800MHz system with the PRO-2006 and it's the exact opposite from the 996T.

I'm happy so far using the PRO-2006. Only if I can fix the backlight I screwed up...not sure how I did that.

 

[SCPD]

I just tapped my 996T and set up UniTrunker. The system I want to monitor is P25 450-460MHz (http://www.radioreference.com/apps/db/?sid=4076). The quality level does not go above 22%, but when monitor another P25 system but 800MHz, the quality level goes to 90-99%.

Likely reasons for the discrepancy:

1. your antenna is better suited to 800 mhz.
2. different modulation formats: is the 800 Mhz system is probably a simulcast CQPSK and the UHF system is likely plain C4FM (which is a bit harder to track) ?

 

[mike_s104]

Likely reasons for the discrepancy:

1. your antenna is better suited to 800 mhz.
2. different modulation formats: is the 800 Mhz system is probably a simulcast CQPSK and the UHF system is likely plain C4FM (which is a bit harder to track) ?

The PRO-2006 is using a mobile mag mount on a metal filing cabinet and the 996T I'm using a larger dipole. With that said, using the 996T, the signal on the 460MHz system is full strength (the one that the quality is less on) while the 800MHz system is very low (the one that the quality is greater on). Doesn't make much sense.

If it's the difference on the systems, why does the PRO-2006 track it better than the 996T? I'll try a few things later on.

 

[mike_s104]

Anyone know what settings I need to have for using it with a 380MHz P25 trunked system?