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Programming the Baltimore County (P25) System

From The RadioReference Wiki

Object Oriented Programming

If you own the Pro-106, Pro-197, PSR500, or PSR600 scanner, you have some options as to how you want to monitor the system:

  1. If you will only ever monitor from within the footprint of the main (south) site, you may chose to ONLY enter the south system frequencies (remember, you only ever have to enter the control channel frequencies). You may miss calls that only occur on the north site, but these calls should be rare.
  2. If you move between the coverage footprints of the two sites, you may chose to set your scanner to "ROAM." Is this mode, your scanner will evaluate the strengths of the signals of the control channels from both sites and chose the strongest signal to lock on to. If the signal strength drops below a set threshold, your scanner will automatically evaluate the signal strength of the other site's control channel, and, if it is stronger, will switch to that site. Remember, if your scanner locks onto the north site, calls specific to the south site will be missed.
  3. If you are within reception of both sites, and want to ensure that you hear all calls, you can set your scanner to "STAT" or stationary mode. In this mode, your scanner will sample the control channels of both sites for brief amounts of time, almost like scanning two different systems, but referring to the same list of talk groups IDs.

If you chose option 2 or 3 above, you need to enter in all control channel frequencies (8 total) and select the appropriate multi-site mode.

Thanks to ocguard in this thread for this information


Object Oriented Software Example Screens

  • These screens should be used as a starting point. You may need to play around with other settings to make it work in your situation. This is particularly true of utilizing the attenuator to cut signal overload issues. Both the North and South site frequencies are shown. To view the full image, simply click on it.

ARC500 Screens

  • For those screens that show more than one TSYS, look at the bottom 4 entries

  • TSYS and Frequencies

  • Expert Settings Screen 1

  • Expert Settings Screen 2

  • Global Expert Settings

  • Global Misc Settings

Win500 and PSREdit500 Screens

  • PSREdit500 screen

  • Win500 screen

PSR-800 Bandplan Tables

CH-LO CH-HI OFFSET BASE FREQ STEP SLOTS
0 4095 0 851.00625 6.25 FDMA
4096 8191 4096 762.00625 6.25 FDMA
8192 12287 8192 851.01250 12.5 TDMA 2
12288 16383 12288 762.00625 12.5 TDMA 2


Radio Shack Pro-96 and Pro-2096

  • After programming this system, some users have adjusted VR4 manually by turning the slug until the decode rate improves. This potentiometer can be located by viewing the photo in the PRO-96 Internal Adjustments article


Uniden DMA Digital Trunktrackers

  • System Setup

  • Site Setup

  • Trunk Freqs

Click on the image to enlarge

  • Here are the FreeScan screens that you can use to program the 396T or 996T.
  • Note that XT users should change the system type to P25 Standard
  • Only the South site is shown. The same settings can be used for the North site, but you must use the North Site frequencies in the Trunk Freqs form.
  • If you suspect that you are having distortion issues due to multipath problems, turning on the attenuator may reduce the signal levels enough to at least cut the problem down (as shown)
  • Initial indications are that the XT firmware released in Feb 2012 greatly improves the decode rate. Note that this firmware is NOT compatible with the BCD396T or 996T. Access the P25 Adjust Mode and P25 Adjust Level parameters. The defaults seem to work well, although some tweaking could be needed for your environment. See the Updating the Firmware in Uniden DMA Scanners article


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