Antenna identification on PCM

[keninirvine]

When I went to install an FM modulator on my PCM (06 C2S), I found 2 antenna connections on the back. There is a black one and a yellow one. Does anyone know which one is the FM antenna connection?

Edited March 14, 2010 by keninirvine

[Loren]

Turn the radio on an FM station - pull one at a time and when the station goes - you have the right antenna. (courtesy of RFM)

[keninirvine]

Turn the radio on an FM station - pull one at a time and when the station goes - you have the right antenna. (courtesy of RFM)

Thanks Loren. I should have done that when I installed the device. But when I did it last weekend, I went ahead and intercepted the yellow antenna lead, and everything worked so I assumed I had the right antenna. But I didn't check the other lead as well. I'm concerned about the low gain of the devices being played through the modulator (XM radio or iPod), so started wondering if perhaps I had chosen the wrong antenna. I was hoping to avoid pulling the PCM again if I already have it installed correctly. The low gain results in having to turn up the volume to hear properly, compared to the level required for regular FM stations. Then when I turn off the ignition, the modulator is instantly powered down whereas the radio stays on until the key is pulled. During that interval, I get a blast of white noise on the system due to the volume being so high. I have to remember to turn down the volume before turning off the ignition. It could be an inherent weakness in the modulator, and if so, may need to install the Dension.