The Radio Information Board

It looks like the SM-5102 programs through the DB-9 connector on the back. Is this true or can it be programmed through the mike connector ? Thanks !

I am having problems getting the F50V portable to decode tones generated by an encoder that has a delay (no tone) between the paging tones. The programming software has a provision for changing this delay, but it has little actual effect on the decode ability. The factory claims that this no-tone pa...

Does anyone in the group know where I could find a pdf manual for the TK-840 ? I will be doing an IF filter conversion, and it sure would be nice to have a schematic at least. Thanks, Pete