A full wave 20 meter delta loop, fed with open wire, ladder line or
even TV twin lead & a tuner will load up on all bands 10-40 meters.

Performance on 10-20 will be good, 30 & 40 a little less so.

Terry
W8EJO



John wrote:
I have been researching for a while now around the area of nested delta
loops. I want to upgrade my multi-band vertical antenna with delta loops,
each one resonant to cover 20 to 10m. However there is nothing on the
internet about nested delta loops. My wish is to have the delta loops
orientated such that they are pointed at the top and fed one third of the
way up one of the vertical sides to get a low angle of radiation.

I realise that they have an impedance of around 100 Ohms and this would need
to be matched. The usual method of doing this is to use a quarter wave
length of 75R coax to match to 50R.

Much in the same way that parallel dipoles can be fed with a common feeder,
can 5 delta loops be fed via coax matching stubs with a common 50R feeder?
(i.e. bring the ends of the matching stubs together?).

I tried in the summer to nest 5 delta loops with the feed point as described
above and then brought the feed points together (without matching stubs) ,
however it is not physically possible to do this - they really need
separating out.

Any ideas any one? My basic aim is to have 5 resonant antennas with no
tuning unit involved.

Thanks

John

NomadW8 wrote:
A full wave 20 meter delta loop, fed with open wire, ladder line or
even TV twin lead & a tuner will load up on all bands 10-40 meters.
Performance on 10-20 will be good, 30 & 40 a little less so.

EZNEC says the feedpoint of a 20m loop will be about
3000-j13000 on 40m. The SWR on the ladder-line line
will be around 130:1. For better performance on 40m,
install an insulator opposite the feedpoint thus
turning it into a dipole of sorts on 40m. Short across
the insulator for 20m operation.
--
73, Cecil http://www.w5dxp.com

Or a 1/4 wave 40 meter stub (aka wave trap/auto switch).



Cecil Moore wrote:1. For better performance, on 40m,
install an insulator opposite the feedpoint thus
turning it into a dipole of sorts on 40m. Short across
the insulator for 20m operation.
--
73, Cecil http://www.w5dxp.com