CHP El Cajon is already on a 800MHz Phase 2 trunking system...at least using the San Diego County RCS instead of their low-band. They use the low-band channel assigned to them like a CB radio to chit chat on simplex :-D
Paul
Paul
New antennas on CHP.
- Thread starter oldradioguy2010
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A good part of the funding is from DHS to build a nationwide conglomerate of systems
I saw one of the CHP cars also on 101 in Ventura. There were two or three small square antennas and one flat one about two inches high and about 4 by 18 inches long just above the rear door.
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Is anyone aware if the Kenwood RF decks are able to automatically roam a trunking talk group between RF bands? For example if a CHP officer were to have the 700 MHz radio on a certain CRIS talk group and then drive out of 700 MHz site coverage and into VHF site coverage would the RF deck be able to automatically switch to the same talk group on the VHF radio or would this require the officer to manually switch the VHF radio to the talk group?
It should be seamless to the officer. You sit on TG 861 (using VAL-GOLD from CRIS) and the radio determines the strongest site whether VHF, UHF or 700 based upon RSSI. So it should switch between the two bands no issue. Now if it's a separate deck, I'm sure the officer will have a choice to hit VHF-BLANK or 700-BLANK.
Regards,
-Frank C.
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I apologize but I don't fully understand this answer.
From the images I have seen of the new Kenwood control head it appears the head is showing the channel display for each of the 4 Kenwood radios, low band, VHF, UHF, 700/800. So my point of clarification would be, is it possible for the officer to place the 700/800 radio on TG 861 (just using 861 as an example, it could be any CRIS talk group) and when the vehicle is driven out of 700 MHz CRIS coverage and into VHF CRIS coverage to have the VHF radio **automatically** switch to TG 861 without any input from the officer? Obviously the 700/800 radio would be "out of range" of the system.
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Thank you. I have been trying to find documentation of this in the Kenwood literature and haven't been able to find anything so far.
The Kenwood/Viking multi-deck radios are multiple radios sharing one control head and they share minimal data with each other (GPS position for instance). They're not multiband radios.
It'll be quite interesting to see how this is integrated as there's no mechanism for this yet.
They didn't go with the NX multiband radios? Shame...That with a low-band radio and they're set!
Regards,
-Frank C.
NXs are not multiband. They are multideck. I have a V/U/7-8 system and a standalone low-band (audio is weird on low band deck if tied in with low-power radios)
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Thank you for this. I was fairly sure these radios would not automatically switch bands. I guess the officer could theoretically have the 7/8 radio and the VHF radio parked on the same talk group but that ties up two radios. And would probably drive the officer bonkers with the slight echo effect that would likely occur if receiving the same traffic on both radios.
mmckenna
I ♥ Ø
There's not much showing duplication of coverage between 700MHz and VHF. Right now the only CRIS VHF stuff I've seen mentioned is out in the Eastern Sierra where there is no 700MHz sites.
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Trunking radios switch bands automatically since they are all band capable. We are only seeing dual band systems for Phase II.
VHF/700.
The radio constantly scans in the background all pre programmed frequencies. The radio then have a set of values saying how to treat each site or grab the strongest.
As prev stated VHF so far is for central mountain areas.
VHF/700.
The radio constantly scans in the background all pre programmed frequencies. The radio then have a set of values saying how to treat each site or grab the strongest.
As prev stated VHF so far is for central mountain areas.
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Only if they are true all band radios. Most departments purchase single band radios due to the price of all band radios. I have even seen departments lately purchasing APX 8000's and removing a band or two to save money. This allows them to purchase the radio with the band for their needs now and have the ability to upgrade the additional bands later.
I have seen this with both I and II systems. Also CRIS is II.
This is kind of how it works.
So far. The CRIS system is still years away from being fully built out.
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Does anyone know if the Kenwood low band radios being used in the new RF deck setup are capable of transmitting and receiving on both the base and mobile frequencies in a single "channel"?
The reason I ask is given that CHP doesn't use a typical repeater setup at the "mountain tops" if the radio is only capable of being programmed with an input and output frequency wouldn't that effect the officers ability to hear the mobile units if the mobile repeat is turned off at the "mountain top"?
The reason I ask is given that CHP doesn't use a typical repeater setup at the "mountain tops" if the radio is only capable of being programmed with an input and output frequency wouldn't that effect the officers ability to hear the mobile units if the mobile repeat is turned off at the "mountain top"?
CHP radios don't listen to the mobile frequencies. They are programmed like any other radio, they receive on the "base" frequency and transmit on the "mobile" frequency. If there's no console repeat, they don't hear other officers. If they need to talk to each other, they relay through the dispatcher or they go "car-to-car" or transmit on the "base" frequency.
As of a few months ago, the answer to that is no. The VM-7000 platform allows multiple, separate radios to be attached to one head. They do not interact with each other such that a VHF radio and 800 radio on the same multi-band trunking system would seamlessly roam between bands.
We demo'd this setup and asked for exactly this feature, which was said to be under consideration.
The VM-7000 paired with a Pyramid SVR repeater really is a slick setup.
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