APCO 25 Ham Systems

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ka8ypy

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Did you do a internet search?

Did you look at the different club profiles for those areas to see if any of the clubs advertised that they had that type of repeater?

Chances are - there is not any of that type in that area due to the fact that the digital mode does not work well if at all - except at close range of the repeater.
Hence if you are not LOS - line of sight - or NLOS - near line of sight, those repeaters do not work because of the design.

Really? then why am I able to get into both a VHF and UHF P25 amateur machine form over 30 miles away ?

Truthfully many of the public service modes that started out using the P 25 or POCO 25 if you really want to get technical about it has looked at abandoning it - even before it became popular because of all the problems they have with that type of system.

Ummmm, get a clue and why don't you do an internet search yourself? It's APCO25, and Open Sky (which is what the state of PA is trying to utilize statewide) is absolutely nothing like P25. Apples and oranges actually.

I'm done feeding the troll, sorry for the bandwidth.
 

Daniel_Boone

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You talk to anyone that uses public service radios that has switched to APCO 25 and they will tell you that it sucks - the reason why it sucks is because it does not work as good as the analog radios do when you are trying to operate in challenging terrain.

The reason why your repeater works for you is because you probably live someplace where there is not tall mountains and deep valleys and your signal goes everywhere you want it to.
Some peoples worlds are so small that all they know is what they know which is nothing but their little 1 acre patch of the world.
Unfortunately the world is not flat, nor is it round....

If the world was flat, all you would need to do is put up one repeater and use a very high amount of transmit power and a very sensitive receiver / antenna / pre amplifier and you could talk around the world.

But since it doesn't work like that, the next best thing we ever had was analog radio - which worked very well for 100 years.
Now all of a sudden - we need to keep up with technology and move into the digital spectrum.
Unfortunately digital is a all or nothing type system.
Either you have a picture perfect signal, or you have some pixelation or you have no signal at all.
There is nothing in between.

A real good example of analog radio is the Motorola Mastr II repeater.
Its design was of such that it would stay open long after most other repeaters would close the squelch.
The reason for this was because it was designed for use in the NASA space program.

A digital repeater such as POCO 25 - either you have a signal or you don't.
Add a weather front, bad weather, any type of noise, or a lack of good signal - and all of a sudden you have no signal.

If the reason for amateur radio is to be of public service in times of emergency's - and your repeater doesn't work - then what good are you?

My old Mastr II will still be running long after your digital repeater is recycled into bicycle frames and sewer pipes and the electronics's are turned into shredded wheat.
 

rescue161

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My old Mastr II will still be running long after your digital repeater is recycled into bicycle frames and sewer pipes and the electronics's are turned into shredded wheat.

And your Mastr II will still only talk LOS (Line of Sight)...lol
 

newsphotog

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You talk to anyone that uses public service radios that has switched to APCO 25 and they will tell you that it sucks - the reason why it sucks is because it does not work as good as the analog radios do when you are trying to operate in challenging terrain.

A digital repeater such as POCO 25 - either you have a signal or you don't.
Add a weather front, bad weather, any type of noise, or a lack of good signal - and all of a sudden you have no signal.

Since you seem to be the expert, could you please enlighten the RadioReference community on what "POCO 25" is, and why you believe that digital modulation travels differently than other types of modulation?

Either you have a picture perfect signal, or you have some pixelation or you have no signal at all.
There is nothing in between.

Pixelation? Are we talking RF or JPG here?
 

mikewazowski

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A real good example of analog radio is the Motorola Mastr II repeater.
Its design was of such that it would stay open long after most other repeaters would close the squelch.
The reason for this was because it was designed for use in the NASA space program.

Too bad Motorola never made the Mastr II. It's an old General Electric repeater.

A digital repeater such as POCO 25 - either you have a signal or you don't.

You'd have much more credibility if you could get the name of the standard right. It's APCO25 or P25 for short.

My old Mastr II will still be running long after your digital repeater is recycled into bicycle frames and sewer pipes and the electronics's are turned into shredded wheat.

I doubt you even own any sort of repeater. Most repeater owners actually know who manufactured their repeater.
 

KE7JFF

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You talk to anyone that uses public service radios that has switched to APCO 25 and they will tell you that it sucks - the reason why it sucks is because it does not work as good as the analog radios do when you are trying to operate in challenging terrain.

I know plenty of officers, deputies, and constables who use P25 daily and they have no complaints.

There goes your argument.
 

unlisted

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You talk to anyone that uses public service radios that has switched to APCO 25 and they will tell you that it sucks...
I would not agree with your statement.
A digital repeater such as POCO 25 ....

You really, really know what you are discussing, don't ya?



Sorry I don't normally jump in on these threads, nor do I claim to know lots about radio systems, but I do know you are off the rails on this one.
 

K2KOH

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Connecticut State Police is very happy with their system. It happens to be digital. I have done amateur simplex on digital. It sounds awesome. End of story. Stick to hunting there, Daniel.
 

BigEd1314

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I live in the mountains of Eastern KY and the State Police has a P-25 that works better than the analog systems the Fire/EMS use on the same towers. They expirence very few "fringe" areas. Granted they use vehicle repeaters so they can have hand held access to the system, They still don't have any mobile radio issues with it unlike I do with the local Fire repeater for my area and its dead spots. And yes, its installed correctly with a 5/8 uhf antenna.
 
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Where can I buy a Motorola Mastr II POCO 25 repeater? I have 600' of LMR400 and a J-pole antenna and I want to put a repeater on the air.
 

rescue161

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Where can I buy a Motorola Mastr II POCO 25 repeater? I have 600' of LMR400 and a J-pole antenna and I want to put a repeater on the air.

The Motorola Mastr II won't pass POCO 25 without significant modifications. And I'd just go with a 1/4 wave NMO with the base adapter kit instead of the J-Pole. :)
 

aa4wa

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The Motorola Mastr II won't pass POCO 25 without significant modifications. And I'd just go with a 1/4 wave NMO with the base adapter kit instead of the J-Pole. :)

Just replace the exciter board with a 19D424075G1 version and if that is not available, just get an old Maxon MIII station. A Zetron Mocom 70 should work as well. I would use CODE 3 cable and a WHEELIN hy-GAIN ANTENNA with a good roof mount. Good Luck!
 

CCHLLM

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Just replace the exciter board with a 19D424075G1 version and if that is not available, just get an old Maxon MIII station. A Zetron Mocom 70 should work as well. I would use CODE 3 cable and a WHEELIN hy-GAIN ANTENNA with a good roof mount. Good Luck!

That equipment combo works only when mounted in a 2011 or later Chevrolet Crown Victoria with the 480 volt 3 phase electrical system and Wilson 103 ohm coax.

Sorry, it was too good to resist......:lol:
 
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rescue161

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That equipment combo works only when mounted in a 2011 or later Chevrolet Crown Victoria with the 480 volt 3 phase electrical system and Wilson 103 ohm coax.

Sorry, it was too good to resist......:lol:

The Chevorlet Crown Victorias have all sorts of problems. You're better off with a Ford Caprice as it is not prone to interference like the 3-Phase 480 Volt system is on the CCV.

I hear that Wilson 103 Ohm coax is some good stuff. I'll probably end up using some on my GMRS/ham repeater due to its small diameter. As I understand it, the smaller the diameter is on coax, the less loss there is.

And I also use electrical tape on all of my electrical splices, because it conducts electricity.
 

ae1c

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New P25 system just on the air
W1EMC 145.270 - NAC244/D244 Southborough, MA 40+ mile radius coverage
 

kb2crk

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Anything in GA.? I am sure it has been asked before but i have just gotten my first astro and was hoping to try it out.
 

wv8mat

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I use my XTS2500 for our statewide digital, analog county and both digital and analog ham. No complaints from anything I do with it. And a xts2500 is 399 on eBay. Well worth the time of programming.
 

ae1c

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145.270 P25 in MA.

NAC 244 / DCS 244
Added PA and preselector - preamp to Quantar and went to split tx/rx antennas. Range is now 55-60 mi.
Outstanding P25 repeater covering SNH, EMA, RI, NECT from one site! Give it a try if you are in the area.
 

rescue161

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NAC 244 / DCS 244
Added PA and preselector - preamp to Quantar and went to split tx/rx antennas. Range is now 55-60 mi.
Outstanding P25 repeater covering SNH, EMA, RI, NECT from one site! Give it a try if you are in the area.

How much seperation is there between the TX/RX antennas? What was the range when a duplexer was used? Sounds like a very nice repeater.
 
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