Nick Hall-Patch wrote:
The NRC altazimuth loop design was intended among other things to act
as a direction finder, and to optimize nulls, so the construction
plans are very specific, so as to not introduce "vertical effect"
from imbalances in the winding, or instability of the frame.
Yes, quite right. But I have found over the years that the improved loop
balance also improves the Q, and makes sure the null depth is all it
should be. Out of whack loops I have made, often just won't null as
deeply as a properly balanced loop.
As far as balancing one up during the building stage, it really isn't
much harder.
There are just a few design steps that make all the difference.
I don't use a passive secondary, coupling via the primary and a balanced
hi impedance preamp, on my last loop.
I did have a larger loop, larger than the 4-foot diagonal measurement,
but the smaller loop seemed to have deeper nulls, at least inside.
Rick Kunath
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