HF

Drift Correction for LC oscillator

http://members.ziggo.nl/cmulder/ksbstabi.htm

PIC Frequency Counter with Frequency Lock function

http://www.qsl.net/om3cph/counter/lcd/contribs/pic_flck.htm

Linear scale analog watt meter

http://kd1jv.qrpradio.com/lspwmtr/linear_analog_SWR_meter.HTM

Home made 20m HF SSB Transceiver

http://www.webx.dk/oz2cpu/20m.htm

Lineare QRP a MOSFET

http://www.qsl.net/ik4auy/article_4.htm

http://martein.home.xs4all.nl/pa3ake/hmode/

H-Mode mixer