WE0H wrote:
Hi Mal,
When you say the loop doesn't pick up the low angle DX signals, are you
using a horizontal or vertical loop???
I am not using any loop antennas at present but intend to make a
vertical loop
as per my message.
Bill Ashlock on the east coast of the
US is using vertical loops on 1750-meters with excellent results. He can
transmit a 1w signal 1000 miles easily. What kind of loops are the Europeans
using for transmit???
Over the past couple of years several EU stations have been using loops
for
transmitting as well as vertical antennas and when testing one against
the other
the vertical antenna outperforms the loop by a long way, very big
difference
between the two systems.
I have made this observation while working and listening to their
signals at this QTH and using my vertical antenna for both TX and RX.
I expect they are using small vertical loops near the ground but I am
not sure,
they might join in with some comment.
I intend to make my loop vertical and each side about 20 metres long,
still
small for 136 khz, but bigger than some.
My experience of small loops relative to frequency on 160 metres is that
they do
not perform anything like a full size vertical. They do not pull in the
long
haul dx like the vertical ie KH6/VK/ZL etc A full size loop for the
frequency
would be a different story.
Using small loops and suitable RF amplification on receive can have
advantages,
especially for those living in environmentally noise polluted areas.
I intend to use my loop for RX comparisons against the vertical and not
TX.
Maybe your friends are transmitting on full size loops.
Let me know how you get on and try a vertical as well for comparison.
73 de Mal/G3KEV
I am putting up a vertical loop soon and will report
my results to the Lowfer reflector as well as this reflector.
Mike
http://www.geocities.com/we0h/index.html
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf
Of gii3kev
Sent: Friday, March 01, 2002 12:55 PM
To: rsgb rsgb
Subject: LF: Diversity
Hello LF
Is there a s/ware package available to enable space diversity reception
using a stereo sound card, RH channel for one rx audio input and the LH
for the other rx input.
for instance a vertical ant and a loop ant input. Preferably visual
indication for each antenna and the option to select one or the other or
both.
I am building a square vertical loop ant each side about 20 metres to
observe the difference on RX between a vertical and a loop. Going on
observations from signals used by others using a loop on TX, the results
are not as good as the vertical, but it would be interesting to check on
receive I have tried a 40 metre loop resonant on 160 metres and although
it is quieter than my quarter wave vertical the pick up performance is
not as good as the vertical, long range weak signals could not be heard.
For dx the low angle full size vertical is better than the small mostly
high angle loop.
The same probably applies to 73 and 136 khz.
73 de Mal/G3KEV
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