I have an apx 8500 trunked system that is jumping tower sites every second due to a noise issue from a bluetooth system on a vehicle. We know this is the problem but to diagnose if its a location issue we need to see real time tower site locations to see if moving the device makes a difference. Is there a way to show real time tower site on the keypad instead of using rssi or site search that only displays for a second and disappears? We are using the E5 control head also. The problem it is causing is it is causing the audio on long RX to cut out as it is switching tower sites during the change.
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APX APX8500 jumping sites every second
- Thread starter MSHPTECH
- Start date
What leads you to believe the BT is the cause?
But no, they won't show the site continuously. Even if it did that update is every 5 seconds or so.
Is this an MSI system ? If so do you have an ST ? He may be of value here.
Because when we unplug it the issue goes away....
MTS2000des
5B2_BEE00 Czar
Remoting into your zone controller and run ZW under PRNM suite and watch the ATIA data stream, or if you have Genesis, use GW ATIA activity.
Much more accurate and efficient than trying to do it from a subscriber.
Much more accurate and efficient than trying to do it from a subscriber.
Is this 7/800 or VHF?
Its on both. I believe its a noise causing the issue of cutting out and the site jumping is another byproduct of it. We also witness the audio cut out on conventional vhf also which i've realized is giving me real time data as far as being able to move the component in question to see if its a proximity issue.
Got it. I'd suspect the cause to be the power supply in whatever the device is and not the fact that it's BT as BT is a long way from both VHF and 7/800.
Can you lock onto a 7/800 site and see if it does it? I know a lot of end-users don't have that feature enabled in their subscribers though.
That is my next move is to use site lock. I also don't think its the BT as the frequency is so far away from this. I suspect its a noise of some sort coming from the BT device. The BT device is made to work with the radio so I know its not a compatability issue. And so far its only a number of units doing it not all of them. So we are just trying to isolate as much as we can to figure out the best fix.
Are you by any chance using a Sharkee antenna?
No its on a triband larson 1/4 wave antenna on this particular build. We are taking a spectrum analyzer to it today to see if we can find the noise and isolate it and hopefully move the device to somewhere that doesn't inflict the noise into the radio.
hitechRadio
Member
- Joined
- Dec 23, 2010
- Messages
- 555
My guess is the problem is the BT device itself.
If you are pushing and holding in the RSSI button, it will switch sites you are basically forcing a site switch. Just a push without a hold will show site and rssi without switching. Also a radio will not at least should not site switch while receiving active traffic. and especially since you heard it cut out on conventional also, indicates it is an issue with whatever BT device you have.
Your issue might be with your BT device cutting out and loosing connection, not that it is causing interference with the radio. Assuming it is interfaced with radio. I am thinking of a a bluetooth mic.
What kind of BT device do have, Model would help, and how it is connected. Is it a Motorola device?
BT operates in the 2.4g band.
More specific info may help, I am making a lot of assumptions.
If you are pushing and holding in the RSSI button, it will switch sites you are basically forcing a site switch. Just a push without a hold will show site and rssi without switching. Also a radio will not at least should not site switch while receiving active traffic. and especially since you heard it cut out on conventional also, indicates it is an issue with whatever BT device you have.
Your issue might be with your BT device cutting out and loosing connection, not that it is causing interference with the radio. Assuming it is interfaced with radio. I am thinking of a a bluetooth mic.
What kind of BT device do have, Model would help, and how it is connected. Is it a Motorola device?
BT operates in the 2.4g band.
More specific info may help, I am making a lot of assumptions.
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It is a rf noise issue coming from the wifi chip that is located too close to the antenna. The bt device changed wifi chips on the boards and the boards with the newer wifi chip are the ones with issues. The audio cutting out is coming out of the hard wired speaker and the BT audio device. This is in a motorcycle so the real estate is a hot commodity In this thing so we are limited on what we are able to do with all the equipment we are required to provide in these bikes.
