cliff wright wrote:
Hi! Any one come across any designs for recieving antennas for HF
(especially 14 MHz) for use in a situation with a lot of QRN.
This seems to be radiated from local power lines, but despite the lnes
in our subdivision being underground we still get a S6/S7 noise level.
Yes we have contacted the authorities but so far no useful result.
It seems somewhat worse on my 5/8 wave vertical than on my G5RV doublet.
Neither myself no a neighbouring Ham have been able to find a way
around this problem despite us both being experienced "old timers".
Some sort of "noise antenna" and phasing arrangement is contemplated
but we have not as yet found a suitable design.
Any ideas welcome!
73's Cliff Wright ZL1BDA ex G3NIA

Chip Angle, N6CA, presents some very interesting ideas for a 50MHz noise
cancelling system at: http://tinyurl.com/22gqab

The circuits for phase adjustment, gain control and summing
(cancellation) should all scale easily to HF. However, the noise can
only be cancelled completely if it behaves like a signal originating
from single point. Noise from power lines may be arriving with a spread
of amplitudes and phases.


--

73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek