Object Oriented Scanners Overload Issues
The scanners being discussed in this article include the following;
- Trunking w/ Analog Voice Only scanners, others shown in table can handle up-to Digital P25 Phase I
These scanners have a very sensitive front end
In urban and semi urban environments, or those living in or near areas with numerous FM radio towers, cell towers or places that uses pagers like a hospital, this causes a serious problem with overloading and desense. The cause is likely to be insufficient filtering in the front end, allowing high power FM stations, pagers and so forth to blast into the amplifier (more information on this is needed).
If you are putting up an outside antenna or even something indoors like an attic antenna, a RS800 or other band specific antenna most of any size on these scanners, it's very likely that you will run into this issue. While you can run the Attenuator on the frequencies where you have trouble, a far better approach is to add band appropriate filtering. When adding a filter to your scanner, make the cable run as short as possible to minimize the possibility of stray pickup as well as minimize connectors . The following distributors/manufacturers of filters have been mentioned on RR in the past; please add any others that are found to be helpful.
Return to the GRE/RS Object Oriented Scanners FAQ