The Art & Skill of Radio-Telegraphy William Pierpont, N0HFF (SK)
Zen and the Art of Radiotelegraphy Carlo Consoli, IK0YGJ
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Noteworthy - Tech & QRM/QRN
RF Powered Devices PLT UK Short Range Devices Interference in the UK
Intruder Monitoring: IARU-R1 IARU-R2 IARU-R3
Nasty QRM:
OTHR - Over the Horizon Radar & CODAR
JORN (OTHR - Australia) heard on 21MHz band
NATO "Woodpecker" (PLUTO/PLUTO II) (OTHR - NATO/UK Cyprus) on 14MHz band (~14.019MHz) and 10.125MHz
24/7 signal from Penza Oblast, Russia on 14.027-14.029MHz - LOUD - S9+ in Bermuda at 40° bearing*
*This makes operating on ~14.025MHz and going split upwards almost impossible to EU - the pileup calls directly on top of the S9+ QRM from Penza. Needless to say, it also makes normal QSOs hopeless from 14.0265 to 14.0295MHz from NA to EU.