700mhz

[mikewazowski]

Hobbiests should also keep in mind that this new generation of trunking radios require affiliation before they receive.

Better off to stick with a scanner capable of 700Mhz rather then risk affiliating and getting your radio bricked.

 

[EDACS_Tech]

Great point, Mike. The scanners sound nearly as good as real radios - and don't cost nearly as much. Plus, why bother with engaging in potentially civil illegalities related to system keys and software?

I'm sure this horse has been beaten to death enough....but it's still worth pointing out.

 

[datainmotion]

And to the best of my knowledge did not sell a 12.5 kHz analog trunking system other than 900 MHz.

Weren't all the Type II and IIi systems (800 and 900) capable of 12.5 KHz? I talked on an 800 Mot equipped SMR in Metro Chicago in the early 90s that had 12.5 spacing.

 

[EDACS_Tech]

Weren't all the Type II and IIi systems (800 and 900) capable of 12.5 KHz? I talked on an 800 Mot equipped SMR in Metro Chicago in the early 90s that had 12.5 spacing.

No. "Spacing" is one thing - "occupied bandwidth" is another. The system may have been using a band plan based on 12.5 kHz channel spacing, but in all likelihood, the occupied bandwidth was 25 kHz @ 5 kHz deviation or the NPSPAC 20 kHz @ 4 kHz deviation.

 

[gcr33]

You will not see analog 700 mhz public safety trunking because the FCC adopted a rule a few years ago requiring P25.

Now what will EDACS do with their not yet completed systems in a few years? I assume they will still not be completed.

 

[N_Jay]

You will not see analog 700 mhz public safety trunking because the FCC adopted a rule a few years ago requiring P25.

Now what will EDACS do with their not yet completed systems in a few years? I assume they will still not be completed.

They only require P25 for the Interop channels.

 

[bravo14]

I see pro 96 does 700mhz but does not do trunking. I hear BCD396T does trunking on 700mhz. Don't know in FL we do not have 700 I hear parts of Ill does.

 

[ke5lvt]

800mhz is mix mode (analog and digital) at 12.5khz. 700mhz is digital only at 6.25khz.
motorola is getting away from analog as fast as they can. at least for public safty systems. the new 700mhz system are more computer than radio.

 

[greenthumb]

800mhz is mix mode (analog and digital) at 12.5khz.

As pointed out by an earlier poster, 800 MHz is really a mix of 25 kHz occupied bandwidth with 12.5 kHz channel spacing for the "806" portion of the band. In the NPSPAC ("821") portion of the band, it is 20 kHz occupied bandwidth with 12.5 kHz channel spacing. I haven't seen any 12.5 kHz occupied bandwidth LMR systems on 800 - they're mostly on 900.

700mhz is digital only at 6.25khz.

Actually, analog is allowed in a segment of 700 MHz. They are using 6.25 kHz channel spacing, but occupied bandwidth is allowed at 20 kHz in some allocations.

motorola is getting away from analog as fast as they can. at least for public safty systems.

True...

the new 700mhz system are more computer than radio.

How so? They are not anymore "computer" than current ASTRO-25 800 MHz systems. The only difference is the use of STR-3000 base radios - everything else is the same.

I've heard this comment before and i'm curious as to how/why this statement is being perpetuated. What makes the radio more of a computer than a radio?

 

[ke5lvt]

I've heard this comment before and i'm curious as to how/why this statement is being perpetuated. What makes the radio more of a computer than a radio?

on the newest digital systems (at least motorola) the controler runs the system, every part of it is ip based. all of the radio traffic is data, (voice, data, video, ect.) there is a server than handles all the the radio traffic on each repeater site. all the reapeater does is tx and rx.
sorry if you were confused, i will try to be more clear when making a post here.