Ramsey Electronics URC1 Instruction Manual download pdf (Page 13)

WSR-1A• 13

 29. Install C32, a 10pF ceramic capacitor (marked 10).

 30. Install R38, a 270 ohm resistor (red-violet-brown).

 31. Install C31, another 10pF ceramic capacitor (marked 10).

 32. Install C29, a 22pF ceramic capacitor (marked 22).

 33. Install L8, a 84885-5 variable inductor (smaller metal case with green

plastic.) This coil is the inductive part of the voltage controlled oscillator of

the PLL.

 34. Install C54, a .01uF ceramic capacitor (marked .01, 103, or 10n),

located near J5.

 35. Install C4, another .01uF ceramic capacitor.

 36. Install Q2, a 2SC2498 NPN RF transistor. This transistor is part of the

preamp to amplify the incoming signal after the RF bandpass filter, and

boost it to a level that is usable by U2. Pay close attention to orientation!

 37. Install R3, a 47K ohm resistor (yellow-violet-orange).

 38. Install R2, a 470 ohm resistor (yellow-violet-brown).

 39. Install C30, 15pF ceramic capacitor (marked 15).

 40. Install Q1, the last of the 2SC2498 NPN RF transistors. This is the last

part of the PLL to get the VCO to oscillate. Make sure and place the

transistor in the correct way!

 41. Install C27, a .001uF ceramic capacitor (marked .001, 102, or 1n).

 42. Install R36, a 47K ohm resistor (yellow-violet-orange).

 43. At this point you may want to check your assembly job. Check to make

sure all parts are mounted as closely as possible to the board without

sacrificing neatness, and check all of your solder joints for possible solder

bridges and cold solder joints. We don’t expect you to be an expert at

soldering right from the start, so if you take your time and check as you go,

you will save a lot of time later when you test this out for final operation.

 44. Install R30, a 100 ohm resistor (brown-black-brown).

 45. Install C24, a .001uF ceramic capacitor (marked 102, .001, or 1n).

 46. Install C2, another .001uF ceramic capacitor (marked 102, .001, or 1n)

 47. Install C7, yet another .001uF ceramic capacitor.

 48. Install C12, a 39pF ceramic capacitor (marked 39).

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Ramsey Electronics URC1 Instruction Manual Page 13