What systems do the G4 and G5 support?
The G4 supports multiple P25 systems, including Conventional, P25 Trunking, and P25 Conventional. The G5 supports everything the G4 supports in addition to 2 Tone, 5 Tone and MDC 1200 on either of its two bands.
2 Tone, 5 Tone and MDC 1200 (G5 Only)
Full Spectrum Scan
Linear Simulcast Modulation for Simulcast Applications
800MHz, 20kHz channel spacing and 4kHz deviation for Direct mode communications
Do they work on a Phase II system?
The G4/5 are currently Phase I devices. A Phase II software release is in development and we will begin beta testing in Q4 of 2017.
At this time, we do not have a definite release date but we are hoping that Phase II will be available in early 2018. This software upgrade will be available for purchase and can either be added to a current device, or included with new device at the time of purchase. The Phase II software will MSRP at $150.00.
NOTE: Many Phase II systems support phase I devices; check with your system administrator for details.
Can the G4/5 "scan" a defined trunking frequency (Example: 855.9875, 856.2625, 857.2625, 858.2625)? If so can you scan defined TALKGROUPS on those frequencies?
Yes, TGIDs are assigned along with the Control Channels and Site Information (site information is used to further validate that the pager is assigned to that site(s) in situations where Control Channels are reused in the network). The G4/5 can be pre- programmed with Control Channels and, when first turned on, will scan for the active Control Channel. Once it is on an active Control Channel it stays there until the Bit Error Rate exceeds a predetermined value.
Can the G5, in 2 Tone mode, replace my Minitor?
Absolutely. The G5 does everything the Minitor does and much, much more. The G5 supports many more RF Channels, with and without PL/DPL, and 2 Tone IDs than the Minitor. With an eight position Selector Knob switch one can configure the G5 for more configurations. And, being IP67 (water and dust proof) and designed for rugged Public Safety environments the G5 ensures reliable operation.
Will the G4/5 work on VHF or UHF Trunked Systems?
Yes, the receiver covers a fairly broad band that should cover the Control and Traffic Channel frequency range.
How does the dispatch center send out the P25 page?
With the G4, sending the page is as simple as sending a 2-tone page. The Dispatcher will select the appropriate icon and when they send the page the system will send out the pre-programmed TGID. The Dispatcher can choose to send an Alerting tone like they do for portable radios or not. Once the TGID is sent the Dispatcher can begin sending the voice message.
With the G5, no dispatching changes are required. Agencies can continue receiving their 2-tone calls exactly as before, but gain the ability to also monitor incoming P25 transmissions.
How does the dispatch center activate pagers in the field?
The Administrator will “map” the TGIDs to select Sites or Simulcast Zones. The system then “Forces” the TGID(s) to “Critical Sites”.
Using TGIDs is problematic for my application, are there other methods?
We now support three methods for P25 paging; TGID, Call Alert and QCII over P25. Please contact us to determine which method is best for your application.
Does the dispatcher have to send an alert call the same way they would ping a portable radio?
They could, or just let the G4 generate its internal Alerting tone (or wav file).
Does this unit require any changes to the communications center equipment?
If the Dispatch Center does not currently dispatch on the P25 system a P25 Control Station will be needed.
Does this unit require any changes to how they would dispatch incidents?
If transitioning to the G4 with plans to migrate to P25 paging only, there may or may not be changes. If one already dispatches to P25 Group IDs (directed to Portables and Mobiles) then there probably will be no change required.
The G5 Dual Band P25 no dispatching changes are necessary. Agencies can continue receiving their 2-tone calls exactly as before, but gain the ability to also monitor incoming P25 transmissions.
On an analog radio system we use an encoder to send tones over the radio frequency. In a digital system you have to send data to the pager. How are we sending data to the Pager?
The Dispatching Console, 2-way portable or Mobile sends the appropriate TGID to the G4/5. The G4/5 is monitoring the Control Channel and upon detection of a programmed TGID, it will go to the assigned Traffic Channel for the voice message.
Don’t I need a Portable Radio that affiliates the assigned TGID in order to make the G4 work?
Although this is a good way to initially test the G4/5, in the final configuration the System will be programmed to “Force TGIDS to Critical Sites” thereby allowing the Dispatcher or a back-up Portable to send messages.
How does the G4/5 provide an alert tone?
The pager will decode the TGID and emit an alert tone (user programmable) while it stores the associated message on the assigned Traffic Channel. At the end of the alert tone duration (user programmable) the pager will play the stored voice message from the beginning.
Does the G4/5 store all messages?
The User determines which TGIDs’ messages are to be stored. All stored messages are time and date stamped and stored in non- volatile memory.
They can easily be retrieved by pressing the playback key button which plays stored messages on a last in/first out basis or by using the pager’s menu to selectively find the time and day the message was received. Message memory is very large and if it nears getting full it will automatically purge the oldest read/unread messages to make room for new incoming messages.
Can stored messages be stored on one’s computer?
Yes, we have a Message Backup/Manager Utility that allows one to download all stored messages to one’s computer and sort them on several parameters.