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Main rig = Elecraft K3 (100w HF + 6m)  Also Elecraft P3 Pan-adapter.  

KPA500 now purchased!  Still early days.

Now using ME2T ProII 144MHz Transverter (30W) + Gemini 2 PA (250w out max or 100W for e.g. UKAC's)

OZ2M 70MHZ transverter & block PA (using 41MHZ Xtal & 29MHz IF for lower spurious) about 40w out

Antennas (constantly changing!):

HF =  Home-brew light-weight Hexbeam at 7m (23ft) agl.

100ft Doublet running E - W (dictated by garden orientation!) with pre-set simple match box for 40m & 80m. 

40m Fishing-pole vertical - with half-decent earthing system on clay soil.  Was sometimes marginally best for DX, but now removed as very rarely used it!  

2m =  many iterations from: 6 el home-brew LFA and 9 el Log Periodic-Yagi (based on G3FDW designs - now sk) on to 9el Tonna (more gain but VERY noisy - poor sidelobes particularly in the vertical plane!)

Now onto a G4CQM 8el in kit form from Richard at Powabeam.  About the same boom-length as the Tonna & about the same forward gain; however boy, what a difference to noise pickup etc.  Generally at least an 'S' point or more lower pick-up of local crud.  

All the above prove yet again that boom length seems to be the major factor in forward gain, but good design makes a stagering difference to the noise pickup!

If you have a lot of local noise, select your antenna based primarily on the VERTICAL pattern when using it Horizontally polarised!  I also find about 5 - 10degrees upward tilt also helps to 'cut-off' VERY local neighbours noise generators (in my case solar powered garden LED lights, I think?) Possibly 1dB less gain but about 8dB less noise!

4m/6m = Dual Moxon rectangle with 2 x additional directors on 4m (i.e. 4 elements on 4m & 2 elements on 6m) - single feed; at 8m (25ft)

Old re-built Tenamast has now replaced tilt-over scaffold poles. 8el G4CQM Powerbeam now up to 13m & 4m/6m antenna about 12m max (when the wind allows!) Extra height does help by maybe 3dB in the many restricted directions from this slightly hemmed-in urban location. 


8246685 Last modified: 2017-07-31 09:53:55, 2243 bytes

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