Hello Alan, LF group,
Thank you for your comments.
I am actually living in a house with brick walls and wooden floors.
One of the tests I did was on the second floor of a large concrete community
building.
What is often not appeciated about voltage probe antennas is that the
output
signal voltage is dependent upon the height above ground <<
I have performed some height test as well and found the following figures:
height rel. dB
=================
1.2 m / 4 ft 0 dB
2.4 m / 8 ft + 4 dB
3.6 m / 12 ft + 6 dB
4.8 m / 16 ft + 8 dB
Shielding by bushes in my garden has also been noted. I had to raise it
above these to restore a good s/n ratio. On the other hand, at an open field
near a lake it worked first class 2 metre high and raising it improved
signal strength but not the signal to noise ratio.
I have a 0.7 metre tunable loop hanging on the wall. One of these days I
will try it on 137 kHz indoor.
Best regards,
Roelof Bakker, pa0rdt
|
