ertm15: change balun on 100 MHz ocxo option
Change the TR4 balun attached to the 100 MHz ocxo from 1:16 (WBC16-1TLB) to 1:2 (WBC2-1). Mark as optional the D11 clamping diodes after the balun. Adjust resistors to match 100 ohm termination
Change the TR4 balun attached to the 100 MHz ocxo from 1:16 (WBC16-1TLB) to 1:2 (WBC2-1). Mark as optional the D11 clamping diodes after the balun. Adjust resistors to match 100 ohm termination