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Included with all new K2s, s/n 3000+

Replaces L33 in the BFO oscillator with a new prewound 41uH toroidal inductor that has a  more temperature stable core. Replaces the two 12.096 crystals in the PLL ref. osc. with a single crystal for better temperature stability.

Improves BFO temperature stability on older K2s (less than s/n 3000.)  Also improves SSB carrier rejection on older K2s that had a solenoidal inductor at L33.