see also quansheng
useful links
https://www.hamqsl.com/solar.html http://www.qsl.net/4nec2/ traps:
- https://bafitop.com/why-do-dual-band-antennas-have-a-coil-in-the-middle/
- https://www.arrl.org/hf-trap-antennas
- https://www.sotabeams.co.uk/content/antenna-traps.pdf
https://www.darc.de/fileadmin/filemounts/referate/vus/bandplaene/UHF_Bandplan_70_cm_Mai_2025.pdf https://www.darc.de/fileadmin/filemounts/referate/vus/bandplaene/VHF_Bandplan_2_m_August_2017.pdf https://www.darc.de/fileadmin/filemounts/referate/hf/kurzwellen-bandplan.pdf
hamnet
https://darc-h24.de/technik/was-ist-eigentlich-das-hamnet-und-wie-komme-ich-rein/ https://df9om.darc.de/hamnet.htm https://www.dl1nux.de/hamnet-zugang-mit-mikrotik-antenne-einrichten/ http://www.do4bz.de/hamnet-fuer-benutzer/ https://www.oe3xnr.eu/erste-schritte-im-hamnet-ein-konfigurationsbeispiel/
echolink
terms ig
HT = handheld transceiver / “handie-talkie” (akin to walkie talkie, ww2 terminology apparently. WT is backpack, HT is handheld) counterpoise = ground replacement. in HT this is mainly the person holding the radio.
yagi build
https://www.iz2uuf.net/wp/index.php/2013/04/06/100g-yagi/
cw
CW: http://www.hamskey.com/2024/01/introducing-uv-k5-version-01p-cw.html https://m7isy.rootfs.net/2025/05/20/use-a-standard-cw-paddle-on-a-quansheng-uv-k5-uv-k6/
paddles/keys: https://cwmorse.us/products/micro-morse-code-keys?variant=42247088636163
https://nuwaves.com/make-simple-notch-filter-lab-use/ https://www.rcgroups.com/forums/showthread.php?1758166-Build-a-cheap-5-minute-Notch-Filter https://old.reddit.com/r/amateurradio/comments/2zrkah/best_hf_notch_filter_to_use_to_null_out/ https://www.engineeringradio.us/blog/2023/02/making-a-notch-filter/ https://www.ridiculouslab.com/arguments/radio/notch/notch_en.php https://www.dh8bqa.de/building-a-50-mhz-notch-filter-with-coax-cable/ https://www.dxzone.com/catalog/Technical_Reference/Filters/ https://ka7oei.blogspot.com/2014/06/a-helical-resonator-to-help-isolation.html https://groups.google.com/g/valleyhams/c/9N-1hFUxygA?pli=1 https://www.electronics-tutorials.ws/filter/band-stop-filter.html → great stuff https://vk3il.net/projects/broadcast-band-filter/
nearby noise pollution: https://photos.google.com/search/CgNkYWIiBQoDZGFiKJXBtfK5Mw%3D%3D/photo/AF1QipP46XStu6KhwyTe-ioKVtzIZX_HhuP_5lE-f1pc