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Trbo voting?

Moderator: Queue Moderator

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efc
Posts: 156
Joined: Thu Mar 16, 2006 8:42 pm
What radios do you own?: cdm 1250

Trbo voting?

Postby efc » Wed Sep 18, 2013 5:57 am

Hello,got s customer with all trbo equipment,in analog now,and Mtr 3000 receivets,which we thought of converting to Trbo and use the current SNV12 voting system.Anyone done this? Thanks.
John

Ali Abbassi
Posts: 21
Joined: Fri Jun 13, 2008 4:57 am

Re: Trbo voting?

Postby Ali Abbassi » Wed Sep 18, 2013 12:04 pm

The SNV12 votes the Audio based on the signal to noise ratio of the detected audio which will work fine with FM mode , In Mototrbo digital mode the recovered audio doesn't have the noise component that the voter is making selection based on , therefore SNV12 can not function properly .

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Wowbagger
Aeroflex
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Joined: Tue Dec 10, 2002 10:46 am

Re: Trbo voting?

Postby Wowbagger » Wed Sep 18, 2013 12:30 pm

Yes, to do voting on a digital system you need to be looking at the parametrics of the bitstream, not the parametrics of the voice - you'd need information from the actual Trbo receiver.
This is my opinion, not Aeroflex's.

I WILL NOT give you proprietary information. I make too much money to jeopardize my job.

I AM NOT the Service department: You want official info, manuals, service info, parts, calibration, etc., contact Aeroflex directly, please.

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efc
Posts: 156
Joined: Thu Mar 16, 2006 8:42 pm
What radios do you own?: cdm 1250

Re: Trbo voting?

Postby efc » Wed Sep 18, 2013 12:43 pm

Yes,wowbagger,that is sort of what i was thinking.Plus the more i think about it,i wonder if a person could use a Motorla MIP 5000 Gateway as the link between voter and the Mtr 3000 tac receiver.
John

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Bill_G
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Re: Trbo voting?

Postby Bill_G » Wed Sep 18, 2013 1:22 pm

There is no voting system for Trbo digital yet. I haven't looked at Trbo analog (yet) to determine if it has the high freq noise content necessary to drive an SNV12 correctly. For now, if the customer really needs voting, and wants to stay single channel, then stay analog with MTR2K or Quantars. OTOH, if they really want to migrate to DMR, then get licensed for additional channels, use Trbo ip site connect, and set the subscribers rcvr threashold to roam to the best local site. The subscriber will do site voting rather than the system doing the voting.

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d119
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Re: Trbo voting?

Postby d119 » Wed Sep 18, 2013 2:37 pm

Bill_G wrote:For now, if the customer really needs voting, and wants to stay single channel, then stay analog with MTR2K or Quantars.


Neither of which has been manufactured for at least a year... Those are gone, Bill.

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escomm
Queue Moderator
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Re: Trbo voting?

Postby escomm » Wed Sep 18, 2013 4:06 pm

Well I can't speak for the SNV but I can tell you Motorola sanctions the MTR3000 in analog with Digitacs and Spectracs. As the accessory jack has been working for some time on the XPR8400, it stands to reason that model too would be compatible, at least with Motorola product. Just do not think you will ever simulcast from an MTR3000...

Also, I can't seem to find any reference to it, but I could have sworn I read somewhere that Motorola was going to release voting for TRBO TDMA modulation at some point. Don't quote me on that. It's obv being done with Phase 2 so I don't see how TRBO would be much different. You can quote me on the MTR and analog voting, though: http://www.motorolasolutions.com/web/Bu ... 0Sheet.pdf

KitN1MCC
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What radios do you own?: ht1550 XLS,6 MT-1000,

Re: Trbo voting?

Postby KitN1MCC » Wed Sep 18, 2013 6:00 pm

how wide of an area are they using. could not just go digital and use the IPSC with Multi sites

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Bill_G
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Re: Trbo voting?

Postby Bill_G » Wed Sep 18, 2013 9:09 pm

d119 wrote:
Bill_G wrote:For now, if the customer really needs voting, and wants to stay single channel, then stay analog with MTR2K or Quantars.


Neither of which has been manufactured for at least a year... Those are gone, Bill.


I know, but until I've seen something work well for an application (ie: voting), I can't recommend it. We've done MTR3k stand alone repeaters, and a couple upgrades from MTR2K's, but never placed one into service with a voter. OTOH, we've done lots of IPSC, and that works really well. It's reverse voting, but it does require more licensed channels which can be hard to come by in some markets.

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Bill_G
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Re: Trbo voting?

Postby Bill_G » Thu Sep 19, 2013 6:00 am

Wowbagger wrote:Yes, to do voting on a digital system you need to be looking at the parametrics of the bitstream, not the parametrics of the voice - you'd need information from the actual Trbo receiver.


Actually no. You just need to recover packets. Signal quality isn't considered. Just uncorrupted packets. All the data streams are shipped to the "voter" via synchronized link so that all the inbound packets are somewhat lined up. Once a good packet is recovered, it's shipped out to the repeater xmit. All the others are dropped in the bit bucket, and the "voter" moves to the next packet. The key is having the inbound arrive within a timing window. Your transport backbone has to be fast, but your bandwidth can be low - usually well under 100kbs - and you buffer the frames on the order of 10ms so they have time to arrive.

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efc
Posts: 156
Joined: Thu Mar 16, 2006 8:42 pm
What radios do you own?: cdm 1250

Re: Trbo voting?

Postby efc » Thu Sep 19, 2013 6:46 am

Great responses,thank you guys.Like i suspected,Benny from Raytheon daid their voter was not capable brcause of the signal to noise ratio that their voter uses.He said thst hecthought that Motorola was developing something,not sure what,must be some interface or maybe sthird party digitsl voter.He said that he had one fellow in Florida that was using the votet to pass digital audio from a P25 radio back to dispatch,but not a base ststion.I know that Mototrbo works great,but i also knoe i will still have issues with portables,and no voter to help.I was just trying to find a way to utilize their current equipment,to save some money.Instead of ,here try this out at x amount of dollars,while it is still expetimental.


Thanks
John

JRayfield
Posts: 41
Joined: Tue Jan 20, 2009 9:33 pm

Re: Trbo voting?

Postby JRayfield » Wed Nov 20, 2013 2:08 pm

Digital Voting for MOTOTRBO (conventional, IPSC, Cap+, and LCP) will be available soon.

John Rayfield, Jr.
W0PM
Rayfield Communications
Springfield, MO
www.rayfield.net


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