[FedCom] Re: ICOM P-25?

[tvsjr]

Correct. D-STAR uses the AMBE (AMBE 2020+, if memory serves) vocoder using
GMSK modulation, running at an effective data rate of 4.8Kbps for voice
traffic and roughly 1Kbps for data traffic (simultaneous). The 1.2GHz
versions of D-STAR also support a wide modulation occupying 130KHz for
128Kbps of data. The standard for D-STAR is owned by JARL.

P25 uses the IMBE vocoder using either FSK (C4FM) or QPSK-C modulation,
running at an effective data rate of 9.6Kbps.

Icom is producing D-STAR radios for the amateur market (ID-1, ID-800,
IC-2200H with add-in board), and P25 radios for the commercial market.

-----Original Message-----
From: fedcom-bounces at mailman.qth.net [mailto:fedcom-bounces at mailman.qth.net]
On Behalf Of Jason
Sent: Sunday, June 05, 2005 5:04 PM
To: Discussion of Federal Government Communications
Subject: Re: [FedCom] Re: ICOM P-25?

D-Star is not P-25. It's a propriatary digital system from what I've read.

Jason
KE4KZY

----- Original Message ----- 
From: "R. Rankin" <rankin at ku.edu>
To: "Discussion of Federal Government Communications" 
<fedcom at mailman.qth.net>
Sent: Sunday, June 05, 2005 4:32 PM
Subject: [FedCom] Re: ICOM P-25?


> Interesting.  Does ICOM really have a P-25 board in the works?  Or is it 
> that dumb "D-star" that they're putting in ham 2 meter handhelds that 
> isn't compatible with P-25?
>
> Bob, w0nxn
>
> ----- Original Message ----- 
>
>> ...768.7125mhz    keep coming up on the OPTO booth freq  readers and at
>> STARTECK,
>> While AT ICOM showing off their P25 board in the 5000 I lock into that 
>> freq
>> and there was digital comms taking place but was not decoded
>> so i should list it as P25?
>
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