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Apx7500 vip out

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Mar 9, 2010
Does anyone have any experience with the horn/light activation with the APX series? I'm trying to setup station lighting/alert using P25 tone signalling. I've got a APX7500 remote head configuration. There are two accessory connectors which I could use, J2 on the back of the radio and J100 on the control head. According to the service manual, pins 18 and 19 are VIP OUT 1 and VIP OUT 2. I have two separate relays, with pin 24 supplying voltage to the relays. In the CPS, I have the horn/alert function activated and duration/re-trigger times within proper limits. Under tone signalling, I have the external alarm set to AUX 1. In the VIP menu, I've got the setting for horn on AUX #1 and lights on AUX # 2. In the trunking personality, QCII is setup correctly. I've tested this several times, with the radio paging properly, but I have no activity coming from VIP 1 or VIP 2. My understanding is the relay power is supplied by pin24 (battery voltage) and the VIP OUT grounds when triggered, activating the relay coil. Anyone have suggestions?
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