Time Delay Affects P25 Simulcast Reception

Status
Not open for further replies.

WA0CBW

Member
Joined
Dec 8, 2011
Messages
1,238
Location
Shawnee Kansas (Kansas City)
For those wanting to know what affects P25 reception see the article in the April 2014 issue of Mission Critical Communication magazine. The article titled "How Time Delay Interference Affects P25 Coverage" describes how simulcast signals sent from different sites can be distorted because of the time delay in reaching the radio receiver. The article also indicates that going from Phase 1 to phase 2 can distort the signals even more. The article does a good job of explaining the issues in layman's terms.
BB
 

policefreak

Member
Joined
Jan 5, 2007
Messages
1,650
Location
Berlin, NJ
Wirelessly posted (Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-LS720 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30)

What is the article called? Is there any way you could post a link?
 

kruser

Active Member
Premium Subscriber
Joined
Nov 25, 2007
Messages
3,158
Location
St. Louis County, MO
Wirelessly posted (Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-LS720 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30)

What is the article called? Is there any way you could post a link?
All you need is spelled out in the OPs post.
Here's a link but not sure it will work if not a subscriber.

http://digital.olivesoftware.com/Olive/ODE/MissionCriticalArchive/LandingPage/LandingPage.aspx?href=TUNSLzIwMTQvMDQvMDE.&pageno=MzA.&entity=QXIwMjcwMA..&view=ZW50aXR5
 

DisasterGuy

Member
Joined
Aug 24, 2013
Messages
1,190
Location
Maryland Shore
TDI is an issue with any simulcast system (yes even analog conventional) that must be engineered. Part of the impact with P25 is that Linear Simulcast Modulation as part of the standard is supposed to allow timing to be less precise as it is designed to overcome TDI.


Sent from my iPhone using Tapatalk
 

policefreak

Member
Joined
Jan 5, 2007
Messages
1,650
Location
Berlin, NJ
Wirelessly posted (Mozilla/5.0 (Linux; U; Android 4.1.2; en-us; LG-LS720 Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30)

Very informative article.
 
Status
Not open for further replies.
Top