2012 - 2011 - 2010 - 2009 - 2008 - 2007 - old stuff

2012

sleeve and bazoka verticals cheap antennas experiment

realistic PRO2005 / 2006 mods WFM filter mod and NFM discriminator out

K&L tunable bandrejectfilter how does it work ?

70 cm MOXON for hand held

90 degree combiner / devider for experimental use

2011

2m Lowpass Filter mit / with 70cm Notch HAM SAT Filter

FA SDR KIT für 600 KHz, 21.4 und 45 MHz ZF german language

2010

10.7 MHz FA SDR KIT bandscope

howto make coax notch filters and what are they good for. update

2009

DIY 1.2 GHz coax relays with SDS relays

GSM bias tee modification for HAM radio use

the duoband LPDA design of DL9HCG www.dl9hcg.a36.de german language

how easy is one GHz ? a comercial 1 GHz low pass

inline amp 900 - 2150 MHz documentation and modification - update -

Half SDR 10.7 MHz IF converter 20 KHz bandwith

1/2 Lambda Filter this is a low Q halfwave filter from I8CVS found on the K3PGP website

2007

FK105 crossband repeater FK105 failure fixing

old stuff

VHF/UHF ANT this is my design for 2m and 70cm band. on 2m it works as a dipole with reflector. on the 70cm band its a 8 element array.

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dl4xav 2012