Vectronics VEC-1002K - Manual (Page 15)

VEC-1002K Owner's Manual 2 Meter FM Receiver Kit
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! ! 1. Find the 1N751 zener diode--the only diode supplied with the kit.
Like electrolytic capacitors, zener diodes are polarized and work only
when installed one way. Diode polarity is indicated by the black band
located at one end of the glass body.
! ! 2. Install the 1N751 at D1 so the banded end corresponds with the band
marked on the PC board (toward U1). Solder.
! ! 3. Locate Q1, a 2SC2498 plastic transistor.
Important Note: Preamp transistor Q1 is a rugged bipolar device with immunity
to damage from static discharge. However, if you are working in a carpeted
area, it's always a good practice to touch a metal ground before handling
semiconductors.
! ! 4. Note that Q1 has a round and a flat side. Carefully insert the three
leads of Q1 into the three mounting holes provided. Make sure that
the transistor body is properly keyed to the silk-screened outline--if
you insert the transistor incorrectly, it may be damaged when power is
applied. To ensure stable preamp operation and best gain, the body of
Q1 should sit as close to the PC board as possible. If needed, gently
pre-form the leads so the bottom of the transistor is positioned
approximately .15" (or 1/8") above the surface of the board. Long
leads may impair performance.
2SC2498
(C2498)
! ! 5. Once you're satisfied Q1 is mounted properly, solder in place.
Phase 7: Jumper Wires
Your kit has five (5) jumper wires to install. Each should be pre-formed from a
bare length of discarded component lead, as shown below. The approximate
distance between mounting holes is given to help you pre-form each one. When
installed, each jumper should lay flat against the PC board.
span
discarded lead end
! ! 1. Make a jumper with a .2" span. Install at JMP1 and solder.