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Elecraft AF1 Active Audio Filter and Amplifier – QSY Society
https://qsysociety.org/2010/12/18/elecraft-af1-active-audio-filter-and-amplifier/
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, …
eHam.net
https://www.eham.net/reviews/view-product?id=9442
Review Summary For : Elecraft AF1 Active Filter with Audio Amplifier; Reviews: 6 MSRP: $59.95; Description: 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
Elecraft AF1 Active Audio Filter and Amplifier Demo.wmv ...
https://www.youtube.com/watch?v=9zTE-xEocO4
A 40 meter CW signal is first heard without the filter on my Elecraft KX1. Then the filter is switched in for comparison.
Elecraft AF1 Audio Filter - W8FGU
https://w8fgu.com/pics/enclosures/AF1/af1enclosure.pdf
The AF1 enclosure is made of Lexan®, a polycarbonate, which is very strong. It also has a UV blocking coating on one side and was assembled carefully with this side on the outside of the enclosure. Lexan® is more shatterproof than acrylic (Plexiglas® etc.) but is more prone to scratching than acrylic. Since my design goal was to use the AF1 for portable applications, being
AF 1 Elecraft Aktive AF Filter (Kit ) - QRP-Shop
https://www.qrp-shop.biz/AF1
AF 1 Elecraft Aktive AF Filter (Kit ) * Filters: Variable Cutoff Low pass filter (SSB/CW) plus two levels of narrow CW bandpass filtering with tunable center frequency. * Built-in audio amplifier with volume control. * Dimensions: 5-1/2” L x 2-7/8” W x 7/8” H (14 cm x 7.3 cm x 2.2 cm).
AF-1 Active CW filter KIT - KJV.com
https://steadynet.com/emtech/af1-active-cw-filter-kit
The AF-1 active CW filter really brings those distant signals right up out of the noise. The kit is easy to assemble. It consists of a simple filter circuit on a small daughter board. the circuit is inserted into the audio path before the audio amplifier. The AF-1 works with most popular transceiver kits.
AF1_Compatible Products – Elecraft
https://elecraft.com/collections/af1_compatible-products
2 products. Sort Sort Best Selling Alphabetically, A-Z Alphabetically, Z-A Price, low to high Price, high to low Date, new to old Date, old to new. K2 Transceiver Kit. Regular price. $1,099.95. AF1 Audio Frequency Filter. Regular price. $99.95.
Active Filter Design Techniques
https://www2.seas.gwu.edu/~ece121/Spring-11/filterdesign.pdf
In these cases, active filters become important. Active filters are circuits that use an op-erational amplifier (op amp) as the active device in combination with some resistors and capacitors to provide an LRC-like filter performance at low frequencies (Figure 16–1). LR C VIN VOUT V IN VOUT R1 1 C2 R2 Figure 16–1.
Active filters using Operational Amplifier - Applications ...
https://www.brainkart.com/article/Active-filters-using-Operational-Amplifier_36015/
Elements used in active filters are transistor, or op-amp. Active filters offer the following advantages over passive filters: 1. Gain and Frequency adjustment flexibility: Since the op-amp is capable of providing gain, the i/p signal is not attenuated as it is in a passive filter. [Active filter is easier to tune or adjust]. 2. No loading problem:
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