![]() ![]() ![]() This data burst is not sent at thesame time by all the channels, but happens randomly throughout all thesystem channels. If you can't hear a control channel when you step throughthe trunking frequencies (in manual mode), you either don't have all thefrequencies or are too far away to receive the control channel and thesystem.Įach of these controllers sendsout a data burst approximately every 10 seconds so that the subscriberunits know that the system is there. EDACS systems need all the frequencies for thesystem programmed and in the correct (Logical Channel Number)order.The control channel is continually transmitted to the field units andhas a sound similar to listening to a boat engine over the phone (inmanual mode you won't hear this when you are trunking the system.) Thiscontrol channel is also a good check to see if you can trunktrack thesystem. These scanners will allow you to program just Motorola/P25 controlchannels into the trunking system and the voice channels willautomatically be found (but not programmed). ![]() There may be 3 or 4 frequencies assigned as (primary oralternate) control channels but only one control channel will be active ata time. When youprogram Motorola/P25 and EDACS system frequencies into the scanner, one frequency is thecontrol (or data) channel, and the rest are voice frequencies shared byall the users. Trunking systems in general allocate and use fewerfrequencies among many different users.Since the trunking system might send a call and its response ondifferent frequencies, it is difficult to listen to trunked communicationsusing a conventional scanner. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |