APCO-25 and D/PL Tones

[SCPD]

Actually iDEN and Iridium are VSELP, (different versions of VSELP).

Here's a quote from DVSI, the folks that developed IMBE.

The superior performance characteristics of the AMBE® and IMBE™ Vocoders have resulted in their selection for use in following domestic and international communications projects:

* Inmarsat-M
* Inmarsat Mini-M
* Inmarsat Aero-I
* AMSC/TMI
* OPTUS
* APCO Project 25
* IRIDIUM
* ACeS
* ICO

http://www.dvsinc.com/products/software.htm

Here's a disassembled Iridium sat phone that mentions an IMBE codec.
http://members.tripod.com/~publicphone/Iridium.htm

I'll have to dig for the iDEN specs ...

Note: I'm just trying to get the correct information "out there". N_Jay remarks made me check my sources. That keeps me honest and I appreciate that!

-rick

 

[SCPD]

... and it's a good thing he did!

I did a search of Motorola's website look for an intersection of "iDEN" and "IMBE". I found zero documents. I did another search looking for "iDEN" and "VSELP". I found this very obscure reference buried in a list of iDEN specification documents:

Product # 68P81129E15 titled "VSELP 4200 BPS Voice Coding Algorithm For
iDEN"

So .. looks like iDEN is indeed VSELP.

*shrug*

-rick

 

[N_Jay]

Actually iDEN and Iridium are VSELP, (different versions of VSELP).

Here's a quote from DVSI, the folks that developed IMBE.

The superior performance characteristics of the AMBE® and IMBE™ Vocoders have resulted in their selection for use in following domestic and international communications projects:

* Inmarsat-M
* Inmarsat Mini-M
* Inmarsat Aero-I
* AMSC/TMI
* OPTUS
* APCO Project 25
* IRIDIUM
* ACeS
* ICO

http://www.dvsinc.com/products/software.htm

Here's a disassembled Iridium sat phone that mentions an IMBE codec.
http://members.tripod.com/~publicphone/Iridium.htm

I'll have to dig for the iDEN specs ...

Note: I'm just trying to get the correct information "out there". N_Jay remarks made me check my sources. That keeps me honest and I appreciate that!

-rick

Must have been changed sometime between '92 and launch.

 

[AZScanner]

ITS SIMPLE SET YOUR PRO 96 TO 96 MODE AND PUT IN FREQ THE SCANNER WILL KICK OUT THE ID"S REAL SIMPLE............
IF U CAN"T DO THIS YOUR A MORERON!!!!!!!!!!!!

As opposed to a LESSRON?

Whatever you're smoking, it must be good. Anyhow, the point here is reducing interference. If the current digital scanners had a setting where you could instruct the scanner to only stop on specific channels if they were tranmitting a valid, unencrypted digital signal, you could eliminate any interference you might get from pager signals, analog trunked systems, cell towers, etc. Setting your scanner to "96 mode", whatever THAT is, will still not eliminate the interference.

The original poster wanted to take that concept one step further and have his scanner only stop on a talkgroup if the agency of interest to him was on that talkgroup. Kinda like limiting the county dispatch system to only hear calls for your area, not all over the place, which would be a really cool feature! I get what he's trying to do, but there's no way the current scanners will do it. Maybe the "TrunkTracker 5" series will do that, who knows...

But hey, we do have some lovely parting gifts for you, including a lifetime supply of pantyhose and a coupon good for 10 cents off your favorite cat food. Thanks for playing!

-AZ

 

[SCPD]

Thank You AZScanner that's what I was asking.