Vectronics VEC-841K - Manual (Page 19)

VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit
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of the board dry with an untreated tissue. Give it a final alcohol wash, and allow
to dry thoroughly.
Caution: alcohol is highly flammable and must be used
with adequate ventilation! Use safety
goggles, and avoid prolonged skin contact.
It's also best to do this outdoors.
Now that assembly and inspection is completed, you're ready to begin the testing
and alignment phase of construction.
TESTING AND ALIGNMENT
The correct way to test and align the VEC-841K is with a calibrated audio signal
generator and oscilloscope. The alignment is very simple and easy, so it will not
take much time. We have written a simple test and alignment procedure for you
to follow. Please be sure to follow each step as it is written and laid out for you.
This will ensure that filter will perform well. Well, if you are ready, then let's
get started!
Test Equipment Needed:
The following is the test equipment required to accurately test and align the
VEC-841K CW Audio Filter.
•
Oscilloscope with a 10:1 probe and clip ground
•
Audio Signal Generator with RCA cable
•
Power Supply; 9-18 volts DC @ 300mA; cable must have a 2.1mm coaxial
plug with the center pin positive and outer sleeve negative.
•
Small 5 watt speaker with a 3.5mm mono plug. Tip is positive and sleeve is
negative.
•
Mono headphones (optional)
•
Small Plastic Flat-tipped alignment tool
You may want to have a couple of knobs for the Frequency and Selectivity
controls. They will be difficult to turn without knobs.
Initial Setup:
The following steps are to assist you in connecting your test equipment to the
VEC-841K filter. Please follow each step as it is written and laid out for you.