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xts3000r
Guest
ok it is the xg-100m. the hand-held's are the xg-75
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XG-100 Basic programming for P25 800MHZ
- Thread starter stonek554
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Harris P25 digital 800 mhz receive only
Still confused.Several of my Hams Radio friends have Harris 7100s and receive just fine. So far no Dead Radios. Rome/Floyd County,Ga is using Harris Radios(phase 1). They sound as if underwater or wobbly on the 396, 996, HP1 and PSR800 about 50 per cent of the time. My question is can other brands, i.e. Motorola, Johnson etc be programmed to work on the Harris system? I want to purchase an HT and mobile receive only.
Still confused.Several of my Hams Radio friends have Harris 7100s and receive just fine. So far no Dead Radios. Rome/Floyd County,Ga is using Harris Radios(phase 1). They sound as if underwater or wobbly on the 396, 996, HP1 and PSR800 about 50 per cent of the time. My question is can other brands, i.e. Motorola, Johnson etc be programmed to work on the Harris system? I want to purchase an HT and mobile receive only.
Yes.
jim202
Member
Let me jump in here and make a few comments to those that may or may not be fully understanding of the P25 specs.
1. Unless something has changed, there was no requirement for a systems key to be able to allow the radio to function on a P25 trunking system. Motorola and other vendors added that requirement to reduce the number of cloned and illegal radios being on the trunking systems.
2. The P25 specs require that a radio register on the trunking system before the radio can follow and listen to any talkgroup on that system. This in essence removes the ability of any trunking radio on the newer 9600 baud systems from being used as a scanner without affiliating. There are some radio geeks that have found a way around this with special programming tricks, but it is not for the new comer to attempt.
3. I don't know of any trunking system manager that will allow his system key to be obtained to program a radio on his system without approval. Those that do program a radio on a trunking system without authority, will have to bear the full extent of both state and federal prosecution.
4. The scanner group that keeps complaining about how hard it is to get a trunking radio set up for monitoring a trunking system seem to forget that that system isn't there for them to use as a toy. If you really want to listen to it so bad, it is cheaper to just get a digital scanner and stay out of the threat of any legal activity coming your way.
The P25 spec does now have a link layer authentication feature (optional) that can be used to require the radio to be programmed with a key that is used in some type of handshake to verify the radio is legitimate. This key process also has to be done at the system end.
It is NOT the same as a key for programming the radio! In this setup, an unauthorized radio could be programmed for a trunked system from a vendor without a programming key, but when it tries to affiliate it would be rejected for lack of a valid link layer authentication.
This could be used to protect a system from use by radios that do not use a programming key. Since there is a handshake occurring with the system, this should be more secure that a programming key too.
Here is a link to a Motorola sheet describing it...but it is not a Motorola-specific feature.
http://www.motorolasolutions.com/we...ts/ASTRO_25_Radio_Authentication_Solution.pdf
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ElroyJetson
Getting tired of all the stupidity.
Question, does the presence of link layer authentication keep P25-capable scanners from hearing the audio?
Since I don't own any such scanners, I can't know this firsthand.
If a scanner can hear the audio with LLA enabled, it stands to reason that a compatible radio can hear it DESPITE LLA.
That doesn't mean that some creative programming might not be required. Even..."adjusting" the software. Not that many people will have the skills to do that. Certainly a few will, though.
Since I don't own any such scanners, I can't know this firsthand.
If a scanner can hear the audio with LLA enabled, it stands to reason that a compatible radio can hear it DESPITE LLA.
That doesn't mean that some creative programming might not be required. Even..."adjusting" the software. Not that many people will have the skills to do that. Certainly a few will, though.
jim202
Member
The authentication being mentioned above is new and I don't know of many systems that have implemented it. This is different than the system key needed to program radios. The system key is used by the radio software that is used to allow you to program trunking system parameters into the radio to function on the trunking system.
The answer to your scanner question is it will not matter. If your scanner can decode the digital traffic, it will still follow the talkgroups as before.
LLA will not prevent a scanner from listening. What it does do is prevent a radio from registering on the system.
Of course if this is a multisite (non simulcast) system, if there are no radios in that TG on that site, your scanner might not hear traffic.
LLA does not prevent monitoring (even by a "real "radio, as long as it does not try to register). What it DOES do is prevent registration by a radio that was programmed for the system but not authorized to be.
Better security for a system is LLA + talk group encryption. That prevents registration and listening by any radio (scanner or otherwise) that is not authorized.
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