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GM300 & siren interference

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NCFire11

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Jul 25, 2007
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Anyone know what causes a Sho-Me siren(unsure of model at this time) to cause a Moto GM300 to go crazy? Even when the siren is not being used, just ON, it causes a lot of static on the GM300, which gets annoying. Cut the siren off and the interference goes away.

Not sure how they are wired up, I didnt do the install.

Edit: They are stacked on top of each other, the GM300 is about to be replaced with a Harris M3300, so maybe that will fix the problem.
 
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ramal121

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Is that one of those compact sirens? If I remember correctly they have a DC-DC converter in them which would throw out a lot of hash (much easier these days to raise the voltage than manage high amps to drive a 100W speaker).

If that's the case, wait for the new radio. If there is still a problem do what rafdav says and envoke FCC part 15 with some real estate between the two.
 

NCFire11

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The new radios are remote mount so they wont be able to fit on the BlackRack anyway. Ill make sure we put some distance between them this time. The new radios are digital so I dont know if they would even have interference anyway.
 

cmdrwill

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Do you have the GM300 hooked up to the Siren for outside/radio PA?

IF so disconnect the audio going from the radio to see if the noise is getting in there.
REMEMBER the GM300 has a bridge audio /speaker amplifier and external connections can cause problems, even burn out the amp.
 
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