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QRPGuys Active 600Hz Audio Filter - QRPGuys
https://qrpguys.com/qrpguys-active-600hz-audio-filter
The QRPGuys Active 600Hz Audio Filter is a fixed 600Hz bandpass filter with a narrow bandwidth for cw reception. It uses a TL072 JFET op amp IC and LM386 amplifier IC.
Easy Audio Bandpass Filter Kit - QRP Kits
http://www.qrpkits.com/files/AFBPF_Manual_V4_20160707.pdf
The Audio Frequency Band Pass Filter kit from qrpkits.com provides A basic audio filter kit with preamp, op-amp filter and LM386 audio amp to drive headphones or speaker. It has a peak in audio response that is tunable from approximately 300Hz to 2Khz and has a bandwidth of approximately 500Hz. It is designed to provide improved audio filtering ...
Easy Series - Pacific Antenna - QRP Kits
http://www.qrpkits.com/ezseries.html
Affordable QRP Antennas and Kits at exceptional value Easy Receiver Features Easy to build and use. No toroids to wind and only one adjustment to set the receive frequency. Assembles in 1-2 hours. Covers approximately 75kHz of the 40M band. Direct conversion design with a bandpass filter, NE602 mixer and LM386 audio amplifier.
QRP Labs Kits
The Ultimate3S QRSS/WSPR Transmitter Kit is the new edition of the third version in the "Ultimate" QRSS/WSPR kit trilogy. It can produce QRSS, Hell, WSPR, Opera and PI4 slow-signal modes anywhere from 2200m to 2m and even 222MHz bands. Plug-in LPF filters are available for all 16 HF/MF/LF/VHF bands from 2200m to 222MHz. Click! Shop order from $33
Kits | Q R P e r - Q R P e r | QRP radios, product ...
https://qrper.com/category/kits/
The regular kits (with pre-wound toroids!) will be available for purchase January 24, 2022 for $279 US. If you’d like the pre-assembled version, simply click the checkbox that adds $100 for assembly in the WA3RNC store. Here are a few TR-35 specs from the WA3RNC website: Size 5 ½ X 3 ¼ X 1 ½ less protrusions, weight 10.6 Oz
NESCAF – QRP Club of New England
https://www.newenglandqrp.org/nescaf/
We are happy to once again make the New England Switched Capacitor Audio Filter (NESCAF) available to the QRP community. Please be aware that the NESCAF board is approximately 2″ x 2″ (5.08cm x 5.08cm). It’s all through-hole construction, i.e. not a bad build, but we recommend a soldering iron in the 20-30W range.
Low Pass Filter kit - QRP Labs
https://qrp-labs.com/lpfkit
This Low Pass Filter (LPF) kit is based on the G-QRP technical pages design by Ed Whetherhold W3NQN. Kits are available for 16 bands 2200, 600, 160, 80, 60, 40, 30, 20, 17, 15, 12, 10, 6, 4, 2m and 222MHz. The kit uses a high-quality double-sided PCB with silk-screen, solder-mask and through-hole plating.
QRP Kits - Pacific Antenna
Welcome to Pacific Antenna/QRP Kits. Pacific Antenna will be closed for the holidays from December 20 through January 8. Orders received on or before December 20 will ship before Christmas. Orders received after December 20 will ship after January 8. We would like to thank our customers for a great year and wish everyone a happy, healthy and ...
Four State QRP Group
http://www.4sqrp.com/ssbmite.php
Kitted and Offered For Sale By The Four State QRP Group The SSB-MITE is a high-performing SSB filter capable of being added to nearly any receiver. The SSB-MITE uses simple analog signal-processing circuitry to provide highly effective audio filtering from a simple circuit.
NEScaf audio filter - QSL.net
https://www.qsl.net/iw1bco/NEScaf.html
The New England QRP Club NEScaf is a switched capacitive audio filter kit.
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