Vectronics VEC-841K - Manual (Page 22)

VEC-841K Owner's Manual Tunable SSB/CW Audio Filter Kit
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OPERATING INSTRUCTIONS
You may use the VEC-841K with any communications receiver or scanner. You
can also use the VEC-841K with a ham-radio transceiver. The VEC-841K
requires any 9-18 volt DC source.
There are a few items that you will need to operate the VEC-841K. We have
provided a list of these items below for your convenience.
•
Communications Receiver, scanner, or Ham Radio transceiver with proper
cables.
•
9-18 volt DC power supply
•
External speaker with a 3.5mm mono plug
•
Mono Headphones with 1/4" phone plug. (optional)
Receiver or Scanner Operation:
As mentioned in the above, you can use the VEC-841K with a communications
receiver or scanner. A BFO, or Beat Frequency Oscillator, or a Fine Tuning
control will assist you in fine tuning the received signals.
The filter requires audio from the external speaker or headphones output of the
receiver or scanner. Apply the audio signal to the signal input jack, J4. The
signal input jack uses an RCA phone jack (J4), which requires an RCA phono
plug. The center pin of the RCA phono is positive, while the outer shell is
ground.
Next, connect the POSITIVE lead of the external speaker to the TIP of a 3.5mm
mono plug. Connect the NEGATIVE lead of the external speaker to the
SLEEVE of the 3.5mm mono plug. Plug the 3.5mm mono plug into the External
speaker jack, J2.
Next, connect the POSITIVE power supply lead to the CENTER conductor of
a 2.1mm coaxial DC plug. Connect the NEGATIVE power supply lead to the
outer SLEEVE of the 2.1mm coaxial DC plug. Before plugging in the power to
the VEC-841K, set SW2 to the OUT (OFF) position. If you choose to use a pair
of headphones, then DO NOT plug the headphones into the filter until SW2 is
set to the IN position (ON).
Next, turn the receiver volume all the way down, then set SW2 to the IN position
(ON). Set SW1 to the IN position (NOTCH). Now turn the receiver up slightly
so you can hear the received signals on the external speaker, or headphones. The
signal you are listening to is the "filtered" signal. Using the tuning knob on the
radio, tune in a signal you want to listen to. Then use the FREQUENCY and
SELECTIVITY controls to clean up any unwanted or annoying interference.