Andrew,
The BB60D was a complete overhaul of the C. Every part was selected to optimize dynamic range for the power budget. The first thing people notice is that full sensitivity is reached with a -30 dBm reference level instead of a -50 dBm, so signals have to be 20 dB stronger to overload. The second is with preselection, signals at 1/2x or 2x your signal of interest are filtered before any amp or mixer.
Being that close, the jammer won’t be filtered out by the preselector, but the extra 20 dB before overload will make a big difference.
It looks like the preselector band breaks didn’t make it into the manual. They are at 130, 210, 310, 450, 650, 950, 1350, 1950, 3010 and 4210 MHz.
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