ELECRAFT KAF2 Assembly And Operating Instructions Manual
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Brand: ELECRAFT
Category: Switch
Type: Assembly and operating instructions manual for ELECRAFT KAF2
Pages: 16
Download ELECRAFT KAF2 Assembly and operating instructions manual
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Elecraft • www.elecraft.com • 831-662-8345
E L E C R A F T K A F 2
A U D I O F I L T E R a n d R E A L - T I M E C L O C K
Assembly and Operating Instructions
Revision A, August 30, 2001. Copyright © 2001, Elecraft; All Rights Reserved
Introduction
The KAF2 option supplements the K2's crystal filters with effective, low-noise audio filtering. It also adds
a real-time clock, allowing you to check the time or date with a tap of the K2's D I S P L A Y button.
Audio Filter
The KAF2 includes a passive, balanced low-pass filter (LPF) that is in-circuit at all times. It provides
significant attenuation of signals above 3 kHz, including hiss, high-pitched splatter, and carrier leak-
through. The LPF is particularly useful on quiet bands, when using headphones, or with small antennas.
Also included is a narrow, active band-pass filter for CW or data use. The center frequency of the filter is
tunable via two potentiometers. The A F I L switch on the K2 front panel selects either O F F (LPF only),
A F 1 (first CW filter stage), or A F 2 (both stages). The operator can choose to treat both CW filter stages as
a single setting (A F 2 ) by installing jumper W1.
Real-Time Clock
The real-time clock displays 24-hour time, as well as date. You'll find the clock convenient for field
operation since it eliminates the need to bring a separate clock. Time can be easily set using the B A N D +
and B A N D - switches. The on-board lithium backup battery will power the clock for up to several years.
Specifications
Low-pass filter Flatness: better than 1 dB, 0.5 to 2 kHz; Atten.: approx. -20 dB at 4 kHz
Band-pass filter Bandwidth: approx. 80 Hz @ -3 dB, 270 Hz @ -20 dB (two stages cascaded)
Clock Accuracy +/- 20 ppm (+/- 1.7 seconds per day) at 25 degrees C
Date Formats MM-DD-YY or DD-MM-YY; handles all calendar months and leap years
Current Drain Approx. 10 mA
Size 1.5" (L) x 1.5" (D) x 0.5" (H) (3.8 x 3.8 x 12 cm)
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Caution: Some parts in this kit can be damaged by static discharge. Before handling any
transistors or ICs, put on an anti-static wrist strap, or touch a grounded, unpainted metal surface.