APX 4500 Shuts Down once switched to Trunk

FireFighter12105 · Jan 24, 2018

I have an APX 4500 I’m using to provide a fees for our new system. When I’m not on the system and I’m in conventional banks the radio is fine. As soon as I switch over to trunked banks on the system the radio with indicate it’s transmitting or sending data and shut off.

Has anyone had this issue or heard of it and know the cause and hopefully the solution?

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MSS-Dave · Jan 24, 2018

If it shows a red transmit light then shuts down it is probably proof that the radio is inhibited in the trunk system. You need to check with the system administrator to make sure the radio is programed with a valid ID.

FireFighter12105 · Jan 24, 2018

It was a year ago when pulled out of my truck, it’s to the point now where it won’t stay on as soon as I get it switched over

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MSS-Dave · Jan 24, 2018

FireFighter12105 said:
It was a year ago when pulled out of my truck, it’s to the point now where it won’t stay on as soon as I get it switched over

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If you're saying it won't work at all on the trunk radio system but it works correctly and properly on the conventional channels then it is definitely being inhibited.

KevinC · Jan 24, 2018

Do you ever transmit on the conventional frequencies?

MSS-Dave · Jan 24, 2018

KevinC said:
Do you ever transmit on the conventional frequencies?

That was my second thought but you beat me to it... LOL

mikewazowski · Jan 24, 2018

MSS-Dave said:
If it shows a red transmit light then shuts down it is probably proof that the radio is inhibited in the trunk system. You need to check with the system administrator to make sure the radio is programed with a valid ID.

If it was inhibited, he shouldn't be able to power it up again. If it's denied access, I believe he would get a NO COMMS fault.

I would guess a bad battery and the attempts to affiliate are killing it.

rescue161 · Jan 24, 2018

To me, it sounds like a weak battery. We get that from time to time on our system where as soon as a radio tries to affiliate, the current draw from the radio transmitting exceeds the batteries capacity and the radio powers down. Try to transmit on a conventional channel and see if it powers down. If it does, then you need a new battery.

If a radio is inhibited, then it will appear dead on all accounts. No display, no LEDs, nothing.

FireFighter12105 · Jan 24, 2018

It’s on a power supply. I’m using it as a deed radio now. I can TX no issue on a conventional channel. Like I said as soon as I switch over the radio keeps shutting on and off.

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MSS-Dave · Jan 24, 2018

If you can transmit okay on conventional then it looks like I'm still leaning toward some sort of an affiliation problem in the system. Kind of an odd issue the way you describe though.

KevinC · Jan 24, 2018

Maybe the trunking personality is set to high power and the conventional set to low power?

MSS-Dave · Jan 24, 2018

Another thought. I believe you're using this as a feed radio correct? Are you using a magnet mount antenna close to the radio? If you are there could be high RF feedback causing the radio to shut down. That should occur on conventional as well though....

ipfd320 · Jan 24, 2018

it sounds like the Radio is Going Into STUN Mode when its in the Trunk System Mode ---I Had the Same Problem with an 800 Trunking Radio---After turning it off and back on the radio would stay on for about 30 seconds and shut down----i would lean more toward the stun area---the system is not recognizing the radio in question and sending a signal back to shut it down

davidzimmerman · Jan 24, 2018

ipfd320 i was also thinking the same the radio has been BRICKED or STUN Mode my question does the radio have a valid ID.?????/

KevinC · Jan 24, 2018

ipfd320 said:
it sounds like the Radio is Going Into STUN Mode when its in the Trunk System Mode ---I Had the Same Problem with an 800 Trunking Radio---After turning it off and back on the radio would stay on for about 30 seconds and shut down----i would lean more toward the stun area---the system is not recognizing the radio in question and sending a signal back to shut it down

davidzimmerman said:
ipfd320 i was also thinking the same the radio has been BRICKED or STUN Mode my question does the radio have a valid ID.?????/

That's not how inhibit works on Motorola radios. Once it's inhibited all visual functions cease. If it was bring inhibited he couldn't switch back to conventional and have it magically work again.

MTS2000des · Jan 24, 2018

ipfd320 said:
it sounds like the Radio is Going Into STUN Mode when its in the Trunk System Mode ---I Had the Same Problem with an 800 Trunking Radio---After turning it off and back on the radio would stay on for about 30 seconds and shut down----i would lean more toward the stun area---the system is not recognizing the radio in question and sending a signal back to shut it down

That isn't how it works in an Astro 25 environment. I login to RCM, set the radio ID to inhibit. The action shows as "successful" if you're radio is registered in the HLR. If not, then we set the command to "passive" and as soon as the radio does attempt to register, the zone controller sends the INHIBIT command and the radio is bricked. And only the system that initiated the inhibit can unbrick it, or it goes to "the depot".

The radio becomes a dead brick with no ability to operate it at all. If connected to CPS, it will read but be in an inhibited state, with an error message instructing the user to have it unihibited by the console, or to go to the depot. At which point, an RCM user can either reverse the command in RCM, or just send a new command to uninhibit at which point the radio will respond to an OSW with the command and the radio will acknowledge, process it, and come back to life.

What the O/P is describing is some other behavior, most likely a power supply/RF feedback issue. Is the antenna near the power supply?

Anderegg · Jan 24, 2018

Your power supply is not providing sufficient AMPS for the TX of the radio. On radios such as the old Spectra and Astro Spectra, when you power up on a 1AMP power supply or such, the radio will blink red TX, then immediately shut down and repower up again...cycle repeats unless you can quickly switch to a conventional personality before the radio tries to affiliate. I am not familiar with APX4500 power up after loss of 12v, but if the radio dies instantly as it TX's, and doesn't blink, then wait a few milliseconds, then shut down, it's your power supply. If you want to confirm this, try TX on a conventional test frequency...if you don't have a mic attached, program the conventional MDC1200 to send a radio page or similar, something to get some TX out of the sucker.

Paul

mmckenna · Jan 24, 2018

I agree with Paul.

Tell us about the power supply.
And as others have said, how is your antenna set up?

BigLebowski · Jan 25, 2018

I agree with Paul as well. Sounds alike a power supply issue and one I have experienced as well when I once tried to run a 45w Spectra off of a 7 Amp power Supply. Didn’t work too well!

masstech · Jan 25, 2018

Batteries should not be spoken of in this thread. This is a mobile radio, not a portable one.

Based on your location, perhaps the system this radio is configured for is: https://www.radioreference.com/apps/db/?sid=7489

In which case, the radio will do anywhere from 1-30/35W for 700/800.

You should confirm your power supply can supply at least that, and then some.

Then you should check antenna installation and placement.

APX 4500 Shuts Down once switched to Trunk

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