Vectronics VEC-102K - Manual (Page 34)

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also hear government or military SSB voice transmissions and even an occasional
unlicensed "pirate'' station.
A rule of thumb is that the lower frequency ranges (A, B, C) are most active during the
late afternoon, evening and through the night. The higher frequencies (D and E) generally
are most active during daylight hours.
See the conclusion of this book for information on getting more information!
In Case of Difficulty
Your receiver is designed to work perfectly as soon as correct construction is completed.
Let's review those 4 possible building mistakes which will cause your receiver not work:
1. Installing a WRONG part.
Example: Using a 10 ohm resistor in place of 10K ohm(10,000 ohms)
2. Installing certain parts BACKWARDS.
Example: Reversing the (+) and (-) sides of an electrolytic capacitor, or pointing the
flat side of a transistor in the wrong direction.
3. Faulty SOLDER connection.
Example: "cold" connections or solder "bridges".
4. OMITTING a part, solder connection or wire.
Example: if it's supposed to be there and isn't, we have a problem!
If your receiver does not work, review all construction steps carefully. Let somebody else
go over your work and the steps.
Following are minor problems which are easy to solve:
One band seems identical to an adjacent band.
Check the soldering of all the inductors.
Extremely weak volume on all bands.
Test your headphones on a personal stereo and compare them to one or more other
headphones. It is very possible for inexpensive headphones to become defective. Also,
make sure that the battery is in good condition.
Steady, high-pitched squeal or whistle.
Regeneration control is turned too far clockwise.
Regeneration inoperative on some bands, especially D and E.
Incorrect adjustment of trimmer R20. Review Sections 5. If regeneration was previously
fine but now no longer works, the probable cause is a weak battery.
CW signals all sound chirpy or wobbly.