Icom 756 Pro DRM mod

[kc9s]

I have attempted to mod my ICOM 756 pro to receive DRM broadcasts. I inserted a card that works with the 455 kHZ IF and wired power to it. When I connect it to the computer I get nothing but 60 Hz hum. Could this be an isolation issue? If anyone has modified an ICOM 756 pro I would like to make sure I've got the 455 kHZ input tap soldered in the right location. I've found a mod for the ICOM 756 (non Pro version) but the Pro is slightly different. Any help would be appreciated.

KC9S

[kc9s]

It was indeed an isolation problem. I bought a transformer today and the hum disappeared. The audio is crystal clear. I'm listening to CRI on 6080 kHz now.

[simone]

What SNR can you achieve now? Maybe post some results in the corresponding thread?
Simone

[kc9s]

Tonight my high was 17 dB and low was about 6 dB. The audio started to cut out once the SNR dropped below about 9 dB.