Vectronics VEC-1402DK - Manual (Page 14)

VEC-1402DK Instruction Manual High Performance 2 Meter Pre-Amp Kit
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Important Note: If you do not use the balun, you must connect your signal
source to the T1 mounting holes closest to coil L1. The shield side of the coax
must go to the preamp's groundplane (foil connection) as shown.
T1 L1
GND
CTR
INPUT
Finally, note that RFC1 is used only if the preamp will be powered by a remote
phantom DC voltage over the coax line.
We want your preamp to work "first try." To avoid possible damage, follow the
steps for a complete "QC" inspection before applying power:
! ! 34. Check all solder connections. Look for solder bridges or solder
"splashes". Shine a bright light on the solder-side of the PC board,
and keep a sharp eye for dull or poorly flowed solder joints. If the
solder has adhered to the component leads, it will form a shiny “cone”;
a “donut”-like solder connection may indicate a poor connection.
! ! 35. Resolder any suspect solder joints.
! ! 36. Watch for parts installed in the wrong spot! These errors must be
corrected before attempting to align or use the kit.
Important Note: If you find a construction error and need to remove
components, you should use the right tools. A "solder sucker" is a handy item
for unsoldering parts. It consists of a suction bulb or a spring-loaded vacuum
pump to draw molten solder away from the pad and lead. You may also use a
special copper braid called “solder wick”. You'll find it at Radio Shack.
Once a component lead appears to be free of solder, probe it gently with a
dental pick or a small sewing needle to see if it is really free. Attempting to
yank a part from the board with leads still partially soldered will most likely
destroy the component. Be extra careful when desoldering multilayer
capacitors—they are prone to internal lead breakage. If you suspect a
component may have been damaged during removal, it's better to replace the part
than risk reusing it!
Finally, rosin flux can absorb moisture--a potential problem for VHF
preamplifiers mast-mounted in a damp environment. To remove flux, use