New to the fourm, but here is my $0.50 worth.
I have read thru this post very slowly several times, and except for one poster (no names), I think all of you have the wrong idea about IWN and trunking for the WSP.
As some one who has been working in the radio business for 30+ yrears with all levels of goverment, I can tell you that things are on a up ward beat for the WSP.
I was also involed in the testing for the WSP system testing. I have been there, seen it.
1) IWN..........INTERGRATED WIRELESS NETWORK (Internet for radio systems)
2) P25...........Project 25 Title of the technoligy for new radio systems
3) Trunking....The combining of frequency's (5 to 30) under computer control for more effecenct use
4) Analog or Ditigal...The means of the voice audio that is transmitted -- recieved by a radio
5) Narrown Band.. The bandwith used by a radio frequency, FCC mandated ONLY the divideing of a 25kz frequency into two 12.5 kz frequency's. DOES NOT MADATE Y THING ELSE.
6) Convental mode...the use of one or two frequency's (repeater) to talk directly to another user
First off, the FCC mandated that all users below 512 mhz narrow band by midnight Dec 31 2012.
This does not mean that anyone has to go digital or go to trunking, just change the frequency band with.
Now, the IWN project was started back in 2004, when the FED's and Canadian Gov't started looking at better ways to talk to each other and in prep for the 2010 Olympic's.
The IWN system has many relay locations along the US/Candain border and IS NOT a normal repeater system as has been described, it is a microwave system take carriers use to past data and voice information for location to location.
This system has since been expanded to cover over 90% of the state of washington and is used by all the feds, canada and some local goverments.
When the WSP started looking at what it was going to take to comply with narrow banding rules, it was found that in order to provide the some coverage in narrow band that is currently being used in wide band, then over 100 new tower sites had to be aquired, either as a reciever location or as a tranmitter location or both, which also would have to include microwave equipment to send information to a central location, (Dispatch). BIG $$$$
Now then comes the feds and they tell the state that since the IWN back bone is in place, why do you not save money and come on board the system instead of spending big $$ to build out more of your own sites.
After a lot of reserch on the current locations of the IWN sites vs the locations needed for WSP, it was found that this is a VERY good move, as in the long run only a very small number of sites would have to be added.
What this means is, not only can the WSP but also the DOT, DNR, and other state agency's can now pick up a radio and be able to talk to any one any where within the state or to other agency's that are tyied into the system to include any local goverment. (read police,fire). and all agency's to pass data,
(read, license checks)
The WSP is going to narrow band ONLY, no encription and yes there are going to change out equipment in the mobiles and portables to a radio that will allow for the ablity to change channels and talk directly to the local police even thru they are using 800 trunking.
No major frequency changes other then narrow banding is being planned.
As for the trunking, the way that the WSP operates state wide, trunking is NOT a useable item as trunking as a whole will not work over a very large area, (read over about a 50 mile radius), so this
IS NOT a option for the patrol.
Analog voice in the current 25kz frequency band, uses 5kz for audio, in narrow band 12.5 band the audio will be 2.5kz.
Digital is NOT allowed in the 25kz band and will use ONLY 1.7 to 2kz in the narrow band.
Yes, the WSP is also thinking that when they go narrow band, that they will go to the digital audio format as the digial will allow for the passing of data more efficently.
There is some of this new equpment already in use up north of Everett since 2009 and has been working great and has allowed the WSP to talk directly to FEDS and canada.
I also own and operate two radio systems, both narrow band with one in analog and one in digital and
both in convental mode.
I hope that this helps and if anyone has serious questions, please PM me.
Thank you for time.