NEXTEL digital and APCO25....

This forum is dedicated to discussions pertaining specifically to the Motorola ASTRO line of radios (those that use VSELP/IMBE/AMBE), including using digital modulation, digital programming, FlashPort upgrades, etc. If you have general questions please use the General or Programming forums.

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Josh
Posts: 1931
Joined: Mon Sep 03, 2001 4:00 pm
What radios do you own?: APX4K, XTL5K, NX5200, NX700HK

Post by Josh »

Is Digital Modulation, in accordance to APCO 25 specifications anything lke NEXTEL's QAM16 digial? I read a little about both, and they both appear to be pretty similar. And because those Damn "Direct Connect" phones are in the Cop 800Mhz bands, there should be no problem in finding those 851Mhz frequencies.

After all, many business switched from quality conventional radios, whether they be UHF, of VHF, and decided to buy cell phones, why shouldn't I still monitor them? After all, they are "800Mhz digital trunking" radios, too.
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Twisted_Pear
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Joined: Thu Sep 06, 2001 4:00 pm

Post by Twisted_Pear »

iDEN uses VSELP for the voice coding and M16-QAM for the modulation. TDMA is then used to get more capacity per freq. This is very far from the APCO-25 specs.
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