Vectronics VEC-1120K - Manual (Page 28)

VEC-1120K/1130K/1140K/1180K Instruction Manual
26
OPERATING INSTRUCTIONS
The Vectronics direct conversion receiver can be installed in a variety of
enclosures of your own design or choosing. Radio Shack offers many
inexpensive and attractive cases that may be adapted for this purpose. You
might consider selecting a case roomy enough to house an internal speaker, or
larger battery pack.
Tune
1
3
Power
Gain
2
3 . 5 3.6
1. POWER: Push-on/push-off switch turns unit on and off.
2. TUNE: Sets the receiver to the desired frequency.
3. GAIN: Sets the volume level of the received signal to a comfortable level.
Using your direct conversion receiver is a simple as connecting a battery,
headphones or speaker, and antenna to the receiver.
Battery requirements: Use an alkaline battery, such as the DuraCell TM
MN1604. Alkaline batteries are more expensive initially, but are more
economical in the long run.
Tuning CW stations: Tune across the band until a CW signal is heard. Gain
control R1 should be set for a comfortable listening level. Carefully adjust the
tuning until the “beat note”, or tone, suits your tastes. Most experienced CW
operators prefer a lower beat note of about 300 or 400 Hz.
Tuning SSB stations: It may take a little practice to tune a Single-Side Band
signal properly. Direct conversion receivers offer no upper or lower sideband
rejection; slowly tune across the SSB signal until the voices become natural
sounding. Use the gain control to prevent overload and to set a comfortable
listening level.
Tuning AM stations: Unlike SSB signals, AM signals have a carrier frequency-
-you will hear a beat note as you tune across an AM signal. Tune the signal so
the beat note becomes lower in frequency and stop when “zero beat” (beat note
disappears) is reached.
Antenna requirements: Direct conversion receivers need good antennas.
Using a random length of wire will give poor results. Half-wave dipoles are