15
Data Marker Tones
To generate a pair of marker tones for data, set the
Center Freq
control to
2.21k
or
Option
(red lettering). Set
Bandwidth
control to 100-150 for 170 Hz. shift or 400-600 for 200 Hz.
shift. Depress the
Tone
(or
Marker
) push-button to generate two continuous tones at the mark-
space frequencies center around the selected center frequency. The two pairs of frequencies are
the filter center frequency +/- 85 Hz. (170 Hz. shift) or the filter center frequency +/- 100 Hz.
(200 Hz. shift).
CLOVER, SSTV, and WEFAX
These three modes use individual fixed bandpass filters specifically designed for the each mode.
Select the desired filter using the
Bandwidth
control when the
Center Frequency
control is set
to
2.21k
or
Option
(red letters) in the
BP
mode. Set the
Bandwidth
control to
25
for
CLOVER,
50
for SSTV, and
75
for WEFAX. (The 25, 50 and 75 Hz. bandwidth filters cannot
be used for RTTY, AMTOR, PACTOR, G-TOR, or HF packet, so that use of these 25, 50 and
75 switch positions does not interfere with those modes.)
Depressing the
Tone
(or
Marker
) push-button mutes the CLOVER, SSTV, and WEFAX filters.
Releasing the
Tone
push-button immediately restores the CLOVER, SSTV, and WEFAX filters
to normal operation.
Data Bypass Mode
Depressing the
Bypass
push-button places the DSP-59+ into a bypass mode. In the data mode,
the bypass mode routes the signal through an allpass DSP filter which has precisely the same
delay as the normal narrow band filter. When switching from data mode to bypass mode, this
prevents a time discontinuity which can cause an AMTOR or PACTOR link to lose
synchronization. The bypass mode has precedence over the Data mode. When the DSP-59+ is
in bypass, the settings of the parameter select push buttons do not affect the signal.
Turning off or removing power from the DSP-59+ automatically de-energizes the bypass relay
and forces the DSP-59+ into the relay bypass mode. In this mode, a relay connects the audio
input jack of the DSP-59+ directly to the speaker and headphone output jacks. The relay also
connects the audio input jack of the DSP-59+ to the line output jack via a 6 dB attenuator.
Back Panel Jumper Access
Several options on the DSP-59+ may be preset by internal jumpers located behind the back
panel. Remove the back bezel and the back panel to reach the internal jumpers. Do not remove
the front metal panel or the circuit board from the DSP-59+.
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