SB-046 TS-520/520S CW Frequency Shift 8-6-79 Reports of intermittent frequency shift during CW operation, on the order of a few hundred cycles, may be traced directly to the Carrier Unit. On the Carrier unit X50-0009-01, install a ground lead of #18 tinned wire or similar, between the cases of T1 transformer and X3, the LSB XTAL. Recheck frequencies after installing this ground lead. Please annotate your service manual. JEB/yn (c) 8679TKC