AF1 AUDIO FREQUENCY FILTER
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 it’s an ideal project for first-time kit builders.
- Overview
- Specs
- REVIEWS
- FAQ
- Manuals
- Price List/Order
Overview
OVERVIEW
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.
Note: This product is a kit which may involve building the product by selecting individual components, soldering them to the circuit board, winding toroids, installing LEDs and displays, calibrating circuits to meet specified performance levels.
Specs
SPECS
- Size: 5-1/2” L x 2-7/8” W x 7/8” H (14 cm x 7.3 cm x 2.2 cm). Height not including feet or knobs.
- Internal Power: 9V battery
- External Power: 7-14 V (8 V min. recommended)
- Current Drain: 10 mA minimum volume to 100 mA full volume, typical.
- Functions: Low pass plus two levels of bandpass with tunable center frequency in bandpass mode.
REVIEWS
FAQ
