Great product right here in our own back yard. $59.95
from Elecraft, and is one of their mini kits. From
the web page:
The Elecraft AF1 is a versatile audio filter that can
be used with any receiver or transceiver. It can
improve intelligibility of CW, phone, or data signals,
and is especially well suited to radios that have
inadequate I.F. or audio filtering. The AF1 uses
straightforward analog circuitry and no surface-mount
components, so itÂ’s an ideal project for first-time
kit builders.
A rotary switch on the unit allows you to select a
low-pass characteristic with adjustable upper
frequency roll-off, or a narrow bandpass
characteristic. The bandpass filter offers two levels
of selectivity, and its center frequency may be tuned
from about 350 Hz to about 950 Hz. The low-pass filter
is active during bandpass operation, allowing you to
further control the upper frequency response. The
output amplifier drives low impedance phones or a
small loudspeaker. Power can be supplied via either an
on-board 9-V battery or an external supply. An LED
indicates power on/off status.
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