[UK-CONTEST] New HF CW Field Day rules

[Chris G3SJJ]

Just what I was thinking, David, except I would put a jumper in each leg at 39m which would make a 160m dipole with the apex at 72ft. The max current 
node on 80m would be somewhat lower depending on how far each leg was stretched out but stilll extremely effective around UK and into mainland Eu.

Actually it would mean less scaffold poles on top of a car. Last two years we have taken 4 x 20ft poles plus 2 x 12ft tubing plus a gin pole on the 
top of my Freelander to our SSB FD site. The new NFD rule would mean only 3 x 20ft poles, just one 12ft tubing (aka tv mast) and the gin pole. 5 poles 
instead of 7.

We have dispensed with the rope and pulley stuff. At SSB FD we attach a long rope to my tow hitch. At home I use the 12HP ride-on. Dave G3ZQH are now 
well practised at this!

(Apologies for mixing measurements, I prefer metric for smaller dimensions but can visualsie antennas and mast better in Imperial!)

Chris G3SJJ



On 21/03/2012 18:19, David wrote:
> 22m support plus 120m of wire not bad for a V beam with 3 wavelengths per
> leg on 20m - 6 wavelengths per leg on 10m probably beam width too narrow so
> fold wire back on itself to shorten legs. Pre-arrange anchor points so can
> walk wires around to change direction. Straighten out V beam and hey presto
> got a dipole/doublet for the low bands. Might want to add loading coils for
> top band to improve efficiency. Feed with good open wire feeder preferably
> homebrew into matching unit. Use a SEK choke balun?
>
> For the ambitious build those filters to allow two bands to be worked at the
> same time on the same antenna.
>
> 73 David