Mixer for frequency converting both ground and satellite broadcasting signals

A mixing comprising:

• a balun transformer having a middle portion, first and second unbalanced terminals, and first and second balanced terminals, said middle point and second unbalanced terminals being grounded, and said first unbalanced terminal being connected so as to receive a local oscillation signal;
• first and second capacitors having one end respectively connected to said first and second balanced output terminals;
• first and second grounding resistors respectively connected to other ends of said first and second capacitors;
• first and second diodes having cathodes connected in common to said other end of said first capacitor;
• third and fourth diodes having cathodes connected in common to said other end of said second capacitor;
• said first and second diodes connected through a first regulating resistor means to a first control terminal;
• third and fourth capacitors respectively connected to anodes of said first and second diodes;
• fifth and sixth diodes respectively connected forwardly in series between said third and fourth capacitors;
• a first input/output terminal disposed at a junction between said fifth and sixth diodes for receiving input signals of a first frequency and for outputting signals of a second frequency;
• said third and fourth diodes connected through a second regulating resistor means to a second control terminal;
• fifth and sixth capacitors respectively connected to anodes of said third and fourth diodes;
• seventh and eighth diodes respectively connected forwardly in series between said fifth and sixth capacitors;
• and
• a second input/output terminal disposed at a junction between said seventh and eighth diodes for receiving signals of a third frequency and for signals of a fourth frequency.