On the SDR site many of us here use I have noticed on some of the tuners (not all of them) logos and pictures coming up for some stations and I'd really love to know how the hell it's done??

I noticed on Reading tuner that 107.3 Albumheads the little Rock pirate was showing Karizma 87.8's logo but 87.8 is really weak on there nowhere near strong enough to get RDS. And have seen some other London pirate logos come through like Wk-End's but it doesn't always show.
How is this done please.....
