I do sometime clear up the Favourite from my Nuvi350 but it left me wondering why it took so many packets before a single callsign pop-up in the Favourite list. Wonder no more .. after I added an LCD module to my setup I found out that most of the incoming packets were not recognised by Tracker2 eventhough they came with a very strong signal. I have no idea if this has to do with configuration or purely hardware problem. I've a TT4 which could decode most if not all packets it received but surely I need to tweak the configuration. In Tracker2 firmware, I could not find a way to do this. BTW, TT4 is connected to a Yaesu HT through an audio cable while the Tracker2 is connected to a Kenwood TMV71A through a data cable. I've played around with the audio level going through the PR1 pin on the Kenwood but it doesn't help much.
Anyway, since it is hard to get a suitable enclosure for the LCD display, I just epoxy-ed the exposed parts & traces on the LCD and 3M-ed it to my car's dashboard..
Update 1: It seems lowering the audio setting on PR1 pin/Kenwood data port does increase the number of packets decoded by Tracker2. The default setting was at 9, I reduced it to 6 before and now to 4. Probably it was over-deviation that causes the problem? I've no idea really but will monitor if this is the case.