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				One last question, how can you tell if the fm trap is working on the rca?
			
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 The simple test would be to try it in or out on a problem channel. The next level would be to add a HLSJ  or 2 in series, between the antenna and the preamp input. I assume you are using the combined all channel input. The next test level up would require lab equipment, but I think your Sony SNR and error readings would tell you a lot with problem channels.