MFJ MFJ-784B, Instruction Manual, Page: 30 / 74

MFJ-784B Instruction Manual
Operation Error! Main Document Only. -4
4. Place the DSP button in the "out" position. Tune your receiver until a
frequency is found with several CW signals sending at the same time.
When the digital processing is activated by pressing the
DSP button "in,"
you should be able to separate the signals with the Tunable Filters
controls. Careful adjustments to the DSP filter's center frequency (with
moderate or low bandwidth) may even allow you to copy signals that were
undetectable without the filter.
5. Take some time to experiment with the Noise Reduction, AGC, Manual
Notch, and the Tunable Filters controls in the CW mode. For the best
use of this filter, you should become familiar with the effects of all these
controls.
Note: Most people monitor their sending with a transmitter sidetone
oscillator. If you use this common method of monitoring yourself, you
have to program a sidetone filter or ground the T/R line to monitor
yourself. Page 2-5 gives details on this requirement.
SSB (and other voice modes) Operation
The example in this section demonstrates the basic SSB filter functions, and
allows for further confirmation of the station receiver audio level adjustments.
Turn the DSP's
Filters switch to SSB mode and place the AGC and NOISE
REDUCTION buttons out ("off"). Place the DSP button in the "out" position.
Tune in a SSB, AM or FM station and adjust your radio for normal pitch and
volume. Press and lock the
DSP button "in." Adjust the Volume control on the
DSP to a comfortable volume setting.
Note: Always use the DSP's volume control to adjust the volume when the
DSP is "on" unless specifically told otherwise.
1. Observe the Input Level LED and adjust audio input if the LED is not fully
green without ever flashing red. The ideal adjustment point is when the
LED is as green as possible without ever flashing red. If the LED is red,
reduce the receiver's volume control; if the LED is not lit, increase the
receiver's volume control. (Refer to page 2-4.)
2.
Adjust the left Tunable Filters control (center frequency or fc) and the
right Tunable Filters control (bandwidth or BW) to peak the SSB signal
for maximum intelligibility.