400 Mhz system

[Scanner49er]

Recently picked up the Pro-2096 for the digital capability. I'm trying to monitor a 400Mhz system with two control channels. When in search range mode the radio hits on numerous clear voice transmissions switching from FM to DG. When I program the control channels into a bank the radio does as supposed to do, with all except audio. It is a 3600 baud system, Motorola. I have tried unsuccessfully to determine the offset and step size to hit on the correct frequencies for audio. I get ID's from three to five digits. Have tried setting the system to table, multi-table, splinter, and normal. As voice transmissions come thru in the clear when the radio is in search mode I don't feel I am listening to something I should not be monitoring. Any suggestions on how to hit the correct step and offset would be appreciated. Thanks in advance to help given.

 

[Joseph11]

If this is a federal system, try this for the custom frequency table:

Base: 406.0000 MHz
Spacing: 12.5 kHz
Offset: 380

 

[Scanner49er]

That one didn't work. I had tried simular settings to your suggestion. The control channel center tuned to 407.55000 when I originally encountered it while in search mode. I tried to make sense of the offset calculation guide on this site, but it's Greek to me. Thanks for the suggestion. I'll keep plugging away at it and maybe get lucky.

 

[fmon]

Questions

Welcome to the forum.

What is the other CC frequency?
When manually selecting the CC's do both indicate the same SysID?
Are both CC's active at the same time?

Though you can set the scanner to multi table using FUNC + 3, you will need Win96 to set the FUNC + 2 ( Extended Table) settings.

 

[Scanner49er]

The other CC center tunes to 408.05000. Both show system ID as 7705. They are both on at all times or at least everytime I turn on the scanner. After trying Joseph11's suggestion on the 380 offset I just left it there while doing something else on the computer. Now I am getting hit and miss voice channels with steps set at 6.25 or 12.5. The scanner never seems to hit on the second CC. Am guessing all this means I have an incorrect setting somewhere else. Thanks for the feedback. Bring back the old days of my Pro-2005 and the simplicity of monitoring!

 

[fmon]

"center tuned to 407.55000"
"The other CC center tunes to 408.05000"

What are these frequencies prior to center tuning?
Where is this system located?

If both are active at the same time, the system must be a Motorola SmartZone.

 

[fmon]

I have a Ft Bragg p96 with these frequencies. 407.5500 and 408.0500 are both used.

FORT BRAGG  	 407.47500	  MOT	  0.0	 	 	 
FORT BRAGG  	 407.55000	  MOT	  0.0	 	 	 
FORT BRAGG  	 407.56250	  MOT	  0.0	 	 	 
FORT BRAGG  	 408.05000	  MOT	  0.0	 	 	 
FORT BRAGG  	 408.42500	  MOT	  0.0	 	 	 
FORT BRAGG  	 408.62500	  MOT	  0.0	 	 	 
FORT BRAGG  	 409.70000	  MOT	  0.0

If this is the system, the folling setup worked when I when through a couple of years ago.

FUNC + 2
407.0000
380
12.5

FUNC + 3
Table

 

[Scanner49er]

And we have a winner! Thanks to all for the inputs! This one worked like a charm. I can see that I'm still in left field understanding offsets and step settings. Kept trying to apply it at the CC channel frequency. In answer to the other question, both frequencies were .00625 lower than the center tuned frequencies. As far as I can determine through frequent searches these are the only two control channels operational at this time. Again many thanks, will enjoy the investment even more now.