Ramsey Electronics URC1 Instruction Manual download pdf (Page 16)

WSR-1A• 16

 80. Install C15, a 100uF Electrolytic capacitor. Pay close attention to the

polarity markings!

 81. Install L7, the LB53303HK variable shielded coil. (silver metal case with

orange plastic). Solder all of the leads including the metal case pins

securely to the board.

 82. Install R37, a 10K ohm trimmer pot (yellow adjustment marked 103).

 83. Install R17, a 470 ohm resistor (yellow-violet-brown).

 84. Install R6, a 10K ohm resistor (brown-black-orange).

Now we begin assembly of the audio stages. Since synchronization pulses of

satellite data have very distinct black to white transitions, we want those trans-

itions to appear correctly upon decoding of the data. To allow those transitions

to pass properly, we need to have a fairly wide audio response to our filter.

 85. Install C3, a 10uF electrolytic capacitor. Check polarity before soldering!

 86. Install R18, a 10K ohm resistor (brown-black-orange).

 87. Install C6, a .001 ceramic capacitor (marked .001 or 102).

 88. Install R43, a 47K ohm resistor (yellow-violet-orange).

 89. Install R23, a 10K ohm resistor (brown-black-orange).

 90. Install R29, a 1K ohm resistor (brown-black-red).

 91. Install R26, a 1K ohm resistor (brown-black-red).

 92. Install R4, a 10K ohm resistor (brown-black-orange).

 93. Install C10, a 10uF electrolytic capacitor. Pay attention to the polarity!

 94. Install R22, a 10K ohm resistor (brown-black-orange).

 95. Install R42, a 1K ohm resistor (brown-black-red).

 96. Install R1, yet another 10K ohm resistor (brown-black-orange).

 97. Install U6, the LM358 dual op-amp IC. Make sure and correctly orient

pin one and the notch to the parts layout diagram. Verify that all pins are

through the PC board, then solder.

 98. Install R27, a 10K ohm resistor (brown-black-orange).

 99. Install R28, another 10K ohm resistor (brown-black-orange).

 100. Install C9, a 10uF electrolytic capacitor. Again pay close attention to

the polarity markings.

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Ramsey Electronics URC1 Instruction Manual Page 16