Low Noise Receiving antennas
Cecil Moore wrote:
Geoffrey S. Mendelson wrote:
Tony Giacometti wrote:
Or should I take down my vertical transmitting antenna and replace it
with a T2FD?
Neither. I was suggesting (and obviously not very well) that you use it
as a receiving antenna. It's very low noise. It makes a good transmitting
antenna too, but you need to have a big enough balun and termination
resistor to handle the power.
This could be a very interesting experiment. Try the
T2FD but in steps.
1. Ordinary horizontal single-wire dipole
2. Ordinary horizontal folded dipole
3. T2FD
Reporting the noise on those three configurations
vs the vertical would be of wide interest.
well, I already use a shortened dipole which has one leg at 45 degrees (the
end is somewhere between 2.5 to 4 ft high, I have not measured it)
to the feed point that is about 2 to 3 inches off the ground and the other
leg is about 1 to 2 inches off the ground.
I don't use it directly into the receiver, I suppose I could, but I use the
Timewave ANC-4 for reducing noise and its my noise sense antenna.
Obviously this one as I mentioned works extremely well on 40 meters, I can
null out all noise, the S meter lays flat on S1, but the 80 meter
performance is poor.
I would like to try the other antennas you mentioned as sense antennas, the
problem is do I go full size on the folded dipole? I think I need to go full
size with the T2FD in order to get it to work correctly.
How high above ground do I need to get it?
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