MFJ-784B Instruction Manual
Filter Description 5-8
AMTOR Filter [8]
Use: AMTOR, Narrow PACTOR, Wide RTTY, FSK.
Passes high frequency tones with narrow frequency width.
The AMTOR filter is factory pre-set for best performance with standard 2125-
2295 Hz mark-space frequencies (170 Hz shift), 100 baud AMTOR signals.
This filter can also be programmed to one of several different mark-space
frequencies and/or baud rates. This procedure is detailed on page 4-11.
Under special conditions the operator may wish to use one of the adjustable
band-pass filters in place of the AMTOR filter.
PACTOR Filter [9]
Use: PACTOR, Narrow Packet, Wide RTTY.
Passes high frequency tones with medium frequency width.
The PACTOR filter is factory pre-set for best performance with standard
2125-2295 Hz mark-space frequencies (170 Hz shift), 200 baud PACTOR
signals. This filter can also be programmed to one of several different mark-
space frequencies and/or baud rates. This procedure is detailed on page 4-
11. Under special conditions the operator may wish to use one of the
adjustable band-pass filters in place of the PACTOR filter.
SSTV/FAX/WeFAX Filter [10]
Use: Slow Scan, Facsimile.
Passes two separate frequency ranges, one narrow and one wide frequency
width.
This filter is a dual band-pass filter that allows two separate frequency groups
to pass through the filter. The first filter is pre-set to pass frequencies
between 1050 Hz and 1350 Hz for the synch tone and the Vertical Interval
Signal (VIS) tones. The picture content is passed by a second filter at 1450 Hz
to 2350 Hz. This filter is non-adjustable and cannot be programmed to
different frequencies.
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