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Pixie Kit QRP transceiver audio “Humming” problems and cures.
https://www.pixiekits.com/pixie-kit-qrp-transceiver-audio-humming-problems-cures/#:~:text=There%20are%20times%20after%20you%20finish%20building%20your,sometimes%20called%2C%20are%20not%20made%20for%20audio%20circuits
Pixie Kit QRP transceiver audio “Humming” problems and cures.
https://www.pixiekits.com/pixie-kit-qrp-transceiver-audio-humming-problems-cures/
And most times cause “audio hum” to the point that it destroys all audio coming from your Pixie QRP transceiver. If you have no other means of powering your pixie there is a fix for your wall wart with a few extra parts. See the attached YouTube video for an option to …
How The Pixie Transceiver Works - W1SYE
https://w1sye.org/wp-content/uploads/2017/01/NCRC_PixieOperation.pdf
The Pixie Transceiver Original “Pixie 2” c. 1995 NorCal QRP Club Based on “Micro-80” design c. 1992 RV3GM Loosely based on “Foxx” design ... Audio Amplifier RF LO Audio Pixie Key Open - Receiver (Open) The Magic Bus – Key Open Key Open = 7.75 Volts 4.5 Volts Audio doesn’t flow thru reverse-biased D1 Audio RF LO
S-Pixie QRP Kit - W5NOR
https://www.w5nor.org/wp-content/uploads/2018/02/SKU420968-S-Pixie-User-Manual.pdf
“PIXIE” is a very small volume of simple 40 meter band micro-power amplitude telegraph transceiver, Despite it's small size and DC receiver limitations, it is capable of working several hundred miles when connected to a good 40 meter antenna. "S-Forty-9er", Designed by “LXQQFY.com”,. Improvements are as follows:
S-Pixie QRP Kit - CRADI
https://cradi.net/resources/Bricolage/S-PIXIE/S-Pixie.pdf
“PIXIE” is a very small volume of simple 40 meter band micro-power amplitude telegraph transceiver, Despite it's small size and DC receiver limitations, it is capable of working several hundred miles when connected to a good 40 meter antenna. "S-Pixie", Designed by “LXQQFY.com”,. Improvements are as follows:
The Pixie 2: Part 1 - VA3ROM
http://www.va3rom.com/docs/ATD033.pdf
Pixie \ ¨pik-s \ (noun): In folklore, a tiny supernatural being with magical powers, or a fairy-like or elfin creature, especially one that is mischievous but not harmful; or a tiny Amateur Radio very low power (QRPp) transceiver. Figure 1: A 21st century Chinese Pixie 2 clone housed in an acrylic skeleton case with added circuit features.
S-Pixie QRP Kit
https://cupano.com/wp-content/uploads/2019/03/S-Pixie-QRP-Kit-Student-Manual-v1-0.pdf
The Pixie 2 is a small, versatile radio transceiver that is very popular with QRP (low power) amateur radio operators the world over. It reflects a history of contributions from amateur radio operators looking to build the simplest transceiver possible. At it’s core it is a crystal controlled (single frequency) sub 1-Watt QRP CW transceiver.
The "Pixie" CW Transceiver - Welcome to g4izh.co.uk
http://www.g4izh.co.uk/the-pixie-cw-transceiver.html
The "Pixie" 1 Watt CW Transceiver for the 30 to 80m Bands. These 40m CW Transceiver kits are widely available from China via e bay and other sources. A lot has been written about these on the net so I won't repeat it all here. The PCB measures only 2 inches square and is very well made. All the components are supplied including the BNC aerial ...
The Cricket - VA3ROM
http://www.va3rom.com/docs/ATD035.pdf
8. There ˇs an audio muting MOSFET electronic switch during key down times that avoids the Pixie 2 ˇs QSK problem with its audio coupling capacitor ˇs charge/discharge cycles being amplified by the LM386, which creates loud and hard on the ears clicking in your headset. 9. An NJM2113 BTL (bridge-tied-load) audio amplifier with audio bandpass
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