KE7JFF wrote:
Not exactly true...from some seminar I took, if you must P25 on VTAC, you must use a NAC of $293 and you put DG on the end of the channel name; its advisable to be in mixed mode.
Thats the problem- Everyone has different information and spread it as gospel. I know of no reason that anyone "must (use) P25 on VTAC" other than their people forgot or decided against putting these frequencies into their equipment set as analog.
You have to look at it from the department (who has no digital radios) perspective. If someone comes into a major incident that can't use digital mods then it can cause major issues. And visa versa- An agency sending people over that have no clue they need to switch to analog will never hear the traffic until they locate someone in the know.. if they ever do. Mixed mode only works if the people using the radios understand whats going on. One talks analog which gets received fine. But the operator of the mixed mode radio then tries to respond on digital. Cops and fire personnel dont want to understand their radios for the most part. They just want to push to talk and usually go to interop channels kicking and screaming. Don't need this kind of confusion right after the 9.0 earthquake that everyone talks about.
Ive been to several meetings over the years and when the idea of interoperability and frequencies comes up the talk is always the same. Analog only. Can't speak for the east side. These are all state or county meetings. I don't remember much talk at WWRIC but may consider going to a an upcoming meeting to bring it up.
Thank for that link Craig. I looked around to see who exactly they were and could find no reference to the state of Washington anywhere. If fact the who is information shows-
Registrant Name:Cheryl Lemon
Registrant Organization:SAIC
Registrant Street: 4015 Hancock St
Registrant City:San Diego
Registrant State/Province:California
Saic is associated with
https://www.leidos.com/Tech Name:Scott Evans
Tech Organization:YES, Inc
Tech Street: 8501 Heron Pointe Way
Tech City:Spotsylvania
Tech State/Province:Virginia
Tech Postal Code:22551
(Commercial Vendor)
So my point is that I know of no agency that uses anything from the pages of this organization. One agency cannot assume that other agencies are following the same information if each goes out to find standards set (with input by all counties/cities) by others than the state themselves.
I was one of the biggest pushers for the WSP to keep the car channels analog. To many local sheriff departments and PD's have those channels and use them to contact the troops and even participate in emphasis patrols with them. Eventually the plan is that all our guys will have a VHF p-25 capable radio. But that could be years.
I stand by my opinion that any agency involved in "immediate safety of life" should not be using a digital modulation. The human ear is much better able to decode the words out of the multipath and hash.
From
https://blog.tcomeng.com/index.php/2014 ... -troopers/ Quoting Monty Knorr of the WSP-
Quote:
And if anything throws off that data stream and it’s not aligned or in order, what comes out at the other end is either garbled — you get parts of things, but it’s unintelligible, or, and this is totally different from our old system, you’ll get complete dead silence,” he said.
Dead silence is possible even if the radio is seeing better than a 12db quieting equivalent in signal strength but with multiple sources of multipath.
Sorry- but the new redesigned wheel shaped hexagonal has too many flat spots.
/Rant
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