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Motorola DVRS

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E5911

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Does anyone have direct user ot technician knowedge of the DVRS system. Our agency is comteplating it as a vehicle extender system and I have a few questions.

Pete
 

chief21

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Does anyone have direct user or technician knowedge of the DVRS system. Our agency is comteplating it as a vehicle extender system and I have a few questions.
If you have any public-safety contacts in NC, I believe that they are frequently used on the NC VIPER system. The Asheville (NC) Fire Department also uses them routinely for local fireground comms. They would probably be happy to discuss this with you.
 

N1GTL

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Are you using it just as a repeater or with the Fire Accountability software system?
 

Mr_Boh

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Although OP hasn't responded, I want to give a first tip when deploying a DVRS because I see this mistake WAYYY too often. Get someone who really understands RF to help with the install.... do not just give it to a shop and say "here install this". What a shop without experience will typically do if you are doing DVRS in band is just pick some random location for both antennas. Although the in-band DVRS comes with an incredibly efficient, yet incredibly expensive notch filter, you are still going to want as much physical antenna separation as possible. The most recent one I saw, the customer was using two "Mirage" antennas that were maybe a foot apart for the MSU and the DVRS. Not a time to use mirage antennas if at all it can be avoided (heck isn't the point of this device because you have fringe coverage anyway?) and this was a large vehicle where they should be physically separated as much as possible. I have also seen folks go as far as to mount the DVRS antennas with the plane 90 degrees off of the MSU to utilize the polarization as a filter.

Careful deployment will net really impressive results of the DVRS, which is what you will need when you need it most.
 

Tech21

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Oct 16, 2018
Messages
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Although OP hasn't responded, I want to give a first tip when deploying a DVRS because I see this mistake WAYYY too often. Get someone who really understands RF to help with the install.... do not just give it to a shop and say "here install this". What a shop without experience will typically do if you are doing DVRS in band is just pick some random location for both antennas. Although the in-band DVRS comes with an incredibly efficient, yet incredibly expensive notch filter, you are still going to want as much physical antenna separation as possible. The most recent one I saw, the customer was using two "Mirage" antennas that were maybe a foot apart for the MSU and the DVRS. Not a time to use mirage antennas if at all it can be avoided (heck isn't the point of this device because you have fringe coverage anyway?) and this was a large vehicle where they should be physically separated as much as possible. I have also seen folks go as far as to mount the DVRS antennas with the plane 90 degrees off of the MSU to utilize the polarization as a filter.

Careful deployment will net really impressive results of the DVRS, which is what you will need when you need it most.
Recently installed one The ridge for the tower site was visible from the back side of the building. Installed two antenna's. One for 7/800 and one for VHF. A third antenna was installed about 250 feet away in the center of the common area. The separation for the first antennas was only a few feet because on the futurecom stuff only allows one antenna is connected at a time to the radio. Gave the place full coverage
 
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