2 - G4 pagers running on same site both currently on V2.02 firmware (have tested with v1.35 firmware same results) with encryption key installed. One is monitoring non encrypted talk group and traffic is 99% clear and can be understood. Randomly when monitoring an encrypted talk group that is patched with same traffic the traffic is garbled and the pager acts like it cannot keep up with decoding. 5 minutes later it traffic is clear and has no issues. Am I seeing results of what normally happens with encryption and I am chasing an existing issue? It really does seem that with a pager with full signal strength that it struggles to decode the audio at times.
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ADP Encrpytion garbled traffic
- Thread starter estone4009
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RFI-EMI-GUY
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Just for giggles. move the two pagers physically apart, across the room at least.could be that the IF signal from the clear radio is bleeding into the IF of the encrypted radio.
I will give that a try but it seems to be so random that I can move across room or place touching and maybe 95% of the time it works fine and audio is crystal clear. My gut is this maybe common so trying to decide how far to dig. Trying to open case now with Unication.
Just for the fun of it, check the PPS E7, click on the Zone/Knob where it is programmed, go down to Secure Setting, and make sure it is not checked.
This enable box is checked. If unchecked the pager will not decode any of my encrypted talkgroups as I have verified that in testing.
If checked you will hear the encrypted garble for all encrypted radios, unless you have the appropriate key programmed in using the key loader software.
The key is loaded and it decodes 95% of the traffic with no issues. It is just not consistent and acts like it struggles to decode traffic at times but clears up on the very next transmission usually.
This week been testing new demo units from dealer and get similiar results although newer hardware seems to work better but still has issues decoding audio. Unication support is stating that this is common when the signal strength is low? Has anyone expierenced that issue? The RSSI dBm shows a >-90 even with garbled audio and another pager with non encrypted talkgroup the audio is fine so having a had time justifying a signal strength issue unless they can state somewhere that encrytion requires a stronger signal to function.
RFI-EMI-GUY
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1) Are you trying to decode a simulcast system?
2) are there any BDA's in the building you are testing from?
3) Have you tried the demo outside in the clear areas?
1) Yes it is a simulcast system. Phase 2.
2) No BDA's in play. Just started this testing setup with encryption and at the basic level it is failing.
3) Yes. All of my testing is facing directly out a window towards tower. Pager shows a signal strength of >-90 outdoors or indoors.
We have the traffic patched between the regular talk group and the encrypted talkgroup and side by side comparisons show you can hear complete traffic stream on regular talkgroup but encrypted been be so garbled that a times pager fails to tone after missing initial tones.
The pagers acts as if it needs more precessing power or maybe a perfect signal strength to 100% decode encryption. I am up for testing any options I can before we have to abandon moving to encryted talkgroups. I would like to find someone else using ADP encryption and seeing if my experiences are unique or not.
RFI-EMI-GUY
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Assuming that your testing is done both inside a building and the system is a simulcast system, I would move the testing closer to one of the simulcast towers and test outside in a clear area. I note that you have a previous post about coverage problems and those could be simulcast overload, RF interference inside the building where you are testing. The encryption will suffer as well.
If we can determine this to be simulcast overload is there any options to combat this? This is a deployment of 250+ G4 pagers across the county so I expect ever loction could see different results. What is troubling is that I am in a high strenght signal area so we we move to fring areas with low signal I am afraid of what we could find. We do have one pocket in the county that has signal issues but short of a new tower added to the system I don't see much changing on the infrastructure side. It is a 3 tower multicast system currently.
RFI-EMI-GUY
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There is no off the shelf solution. Talk to your system provider and Unification if it appears simulcast related. The system has to be optimized properly and the Unification pager is reported to be good at decoding simulcast. The problem is that noise and distortion that you might tolerate with normal 2 way dispatch traffic is a bit more critical when you page out. You might have to page out repeatedly and how do you know a pager missed the call? At least with two way, dispatch is expecting a reply.
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