[Premium-Rx] STC STR8213 VHF/UHF DSP rx

[barbara hawkins]

Hi all. Have stumbled accross the VHF/UHF version of the STR8212, the STC/Nortel ST8213. Seems identical to STC8212 from ADC back (different firmware of course) which has enabled me to sort several issues but am stuck on the first LO synthesiser of which I have no data other than it is tracking correctly at 1210MHz to 720MHz but its weak and wobbly at the first mixer MD174. Synthesiser is marked 52USH004004 with a mod label initialled MOF dated 7/8/91. Silly question, but has anyone got a circuit diagram? Regards Kevin G3ZMC