Use dual vibration frequency head to realize double pot double star multi-user reception ---- Satellite TV

Keywords: homemade high frequency head switching switch First, 0 / 12V switching switch production 0 / 12V Voltage Switch Switch Homemade Program has two types of electronic switch sub-port relays, the relay switching scheme is simple, the self-made success rate is high, see Figure 1 for details. Note: Select the relay, it is best to use high-frequency 12V DC relays, such as using ordinary relays, large loss, need to reduce distributed capacitance, such as galving aluminum foil shielding, minimize lead and other measures. Second, 13 / 18V switch switch Figure 2 is a simplest 13 / 18V switching switch circuit, using a contact switching circuit controlled by micro-DC 12V relay, and the author is made, find a bad two-socket, remove the printed circuit board inside. Only the outer casing is left, and the components are fixedly installed. When the component is installed, when debugging, only the potentiometer RP is required, so that the input voltage is 17-18V, the relay can be sucked. Third, 13 / 18V two switching switch Figure 3 is a 13 / 18V two-way switching switch, which is combined by two 13 / 18V single switching switches and a two-socket. Circuit Principle: When the switching voltage input by the IRD1 interface is sent to the switching switch, if the V polarization signal is selected, the input voltage is 13V, after voltage by R1, R2, the base voltage Vb<0.7V, Q1 of the triode Q1 As of the cutoff, the relay J1 is not moving, and its normally closed contact is turned on; when the H polarization signal is selected, the input voltage is 18V, VB>0.7V, Q1 is turned on, and its normally open contact is connected to the LNB H interface, the same IRD2 is also switched thus. Diodes D1, D3, capacitors C1, C2 constitute a two-socket for isolation of the output voltage of the two receivers to prevent an electrical pressure inverted by another receiver when the receiver is not operating. Component selection: J1, J2 Select a small volume micro-power DC 12V relay, the outer casing uses a dispenser shielding box with four wiring ports, removes the parts inside, put the fabricated device in it, and pay attention to insulation . When debugging, if the H polarization is switched, the relay can be appropriately increased, and the value of R2, R4 can be appropriately increased until the polarity switching is switched.

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