APX Pin 21 Output for Line Level Audio Out

[Ike2]

I work for a law enforcement agency in Pennsylvania and we will be moving our office to another location. In doing so, we are going to mount ceiling speakers in each area of the office and have them hooked up to an amplifier. The issue is getting the sound from our APX4500 to the amplifier. I see there is an external speaker output, but that is already amplified. I also see that Pin 21 is a line-level audio out and that is probably what I want.

Has anyone successfully taken the Pin 21 and turned it into a RCA output? Anyone have any other ideas if not that?

 

[Echo4Thirty]

You will need to either make sure the RCA on the amplifier is not grounded or (best) use an audio isolator. If you ground any of the audio leads on a motorola mobile, you still blow the audio amplifier internal to the radio. Thats an expensive trip to the Depot.

 

[Ike2]

Would this be OK to use on the external speaker out:

Amazon.com

It doesn't use a ground. It just converts the higher wattage to a line-level RCA.

 

[Echo4Thirty]

I have not used that exact one, typically we just grab a cheap 1:1 audio transformer and stick it in a plastic box. Metering it out with an ohm meter shows zero DC connection from any motorola wire to any of the output wires. The other side of the transformer going to the RCAs can be grounded, just not on the Moto side.

 

[NVAGVUP]

Use something like this to isolate radio from amp input. This provides 600 ohm 1:1 isolation.

JK Audio Pureformer Isolation Transformer

Buy JK Audio Pureformer Isolation Transformer featuring For Use with Line-Level Audio Equipment, Works with Computer Sound Cards, Reduces Hum & Noise, Removes Ground Loops & DC Paths, Isolates & Mitigates Electrical Grounds, Isolates AC & DC Coupling, Uses 600-Ohm Audio Transformers, No Power...

www.bhphotovideo.com