1. QRP Contest (жовтень) - https://www.contestcalendar.com/contestcal_qrp.html
** German Telegraphy Contest (0700Z-1000Z, Oct 2) - https://www.agcw.de/contest/dtc/
** California QSO Party (1600Z, Oct 2 to 2200Z, Oct 3) - http://www.cqp.org/Rules.html
** RSGB DX Contest (0500Z-2300Z, Oct 3) - https://www.rsgbcc.org/hf/rules/2021/rOctoberDX.shtml
** RSGB 80m Autumn Series, CW (1900Z-2030Z, Oct 4) - https://www.rsgbcc.org/hf/rules/2021/rautumn.shtml
** ARS Spartan Sprint (0100Z-0300Z, Oct 5) - http://arsqrp.blogspot.com/2009/02/so-whats-spartan-sprint-and-how-do-i.html
** CWops Mini-CWT Test (1300Z-1400Z, Oct 6; 1900Z-2000Z, Oct 6; 0300Z-0400Z, Oct 7; 0700Z-0800Z, Oct 7; 1300Z-1400Z, Oct 13; 1900Z-2000Z, Oct 13; 0300Z-0400Z, Oct 14; 0700Z-0800Z, Oct 14; 1300Z-1400Z, Oct 20; 1900Z-2000Z, Oct 20; 0300Z-0400Z, Oct 21; 0700Z-0800Z, Oct 21; 1300Z-1400Z, Oct 27; 1900Z-2000Z, Oct 27; 0300Z-0400Z, Oct 28; 0700Z-0800Z, Oct 28) - https://cwops.org/cwops-tests/
** QRP ARCI Fall QSO Party (0000Z-2359Z, Oct 9) - http://qrparci.org/contest/fall-qso-party
** Scandinavian Activity Contest, SSB (1200Z, Oct 9 to 1200Z, Oct 10) - https://www.sactest.net/blog/rules/
** Arizona QSO Party (1500Z, Oct 9 to 0500Z, Oct 10) - https://www.azqp.org/
** Pennsylvania QSO Party (1600Z, Oct 9 to 0500Z, Oct 10 and 1300Z-2200Z, Oct 10) - http://paqso.org/pa-qso-party-rules.html
** South Dakota QSO Party (1800Z, Oct 9 to 1800Z, Oct 10) - http://www.sdqsoparty.com/
** PODXS 070 Club 160m Great Pumpkin Sprint (2000Z, Oct 9 to 2000Z, Oct 10) - http://www.podxs070.com/o7o-club-sponsored-contests/160m-great-pumpkin-sprint
** 10-10 Int. 10-10 Day Sprint (0001Z-2359Z, Oct 10) - http://www.ten-ten.org/index.php/activity/2013-07-22-20-26-48/qso-party-rules
** NAQCC CW Sprint (0030Z-0230Z, Oct 13) - http://naqcc.info/scoreboard.php?sprint_name=202111
** 10-10 Int. Fall Contest, CW (0001Z, Oct 16 to 2359Z, Oct 17) - http://www.ten-ten.org/index.php/activity/2013-07-22-20-26-48/qso-party-rules
** New York QSO Party (1400Z, Oct 16 to 0200Z, Oct 17) - http://www.nyqp.org/
** Worked All Germany Contest (1500Z, Oct 16 to 1459Z, Oct 17) - http://www.darc.de/der-club/referate/conteste/worked-all-germany-contest/en/rules/
** Run for the Bacon QRP Contest (2300Z, Oct 17 to 0100Z, Oct 18) - http://qrpcontest.com/pigrun/
** North American SSB Sprint Contest (0000Z-0400Z, Oct 24) - http://ssbsprint.com/rules/
** RSGB 80m Autumn Series, SSB (2000Z-2130Z, Oct 28) - https://www.rsgbcc.org/hf/rules/2021/rautumn.shtml
** CQ Worldwide DX Contest, SSB (0000Z, Oct 30 to 2359Z, Oct 31) - http://www.cqww.com/rules.htm
2. Таблиця SDR приймачівЖ World of Receivers and Transmitters - https://rx-tx.info/table-sdr-points?country=46
3. SDR-SERVER List - http://www.ve7ed.com/extdocs/SDR.html
4. CW morse code course (I4CQO) - http://www.i4cqo.it/corso%20cw.htm
5. Hairpin elevated antenna 40 m band – tips & tricks - https://yo4dft.ro/2021/03/15/hairpin-elevated-antenna-40-m-band-tips-tricks/