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- Subject: [IRCA] September 7 TP DX on new Wellbrook N/NW Flag part -1
- From: Mark Connelly <markwa1ion@xxxxxxx>
- Date: Mon, 7 Sep 2015 17:10:33 -0400
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Quick demonstrations of how different the reception can be with a terminated loop pointing one direction versus the opposite direction are in the following audio clips. These are in stereo with one channel being from a Drake R8A connected (via transformer and coaxial cable) to one side of a Flag antenna and the other channel being from another R8A set identically in bandwidth and connected via transformer and cable to the other side of the same antenna. When you listen to the recordings, the audio on one channel is occurring at the same exact time as on the other.
These were done in the daytime in 2004 and 2005 from my former location at Billerica, MA (15 miles northwest of Boston).
http://chowdanet.com/markc/WEB2005A/dx_wesx-wneb-1230.mp3
1230 kHz: NE side = WESX Salem, MA; SW side = WNEB Worcester, MA.
http://chowdanet.com/markc/WEB2005A/dx_wmrc-wccm-1490.mp3
1490 kHz: NE side = WCCM Haverhill-Lawrence, MA; SW side = WMRC Milford, MA.
http://chowdanet.com/markc/WEB2005A/dx_wnri-wmyf-1380.mp3
1380 kHz: NE side = WMYF Portsmouth, NH; SW side = WNRI Woonsocket, RI.
Mark Connelly, WA1ION
<<
This morning is kind of a significant one for me -
this is the first time
since around 1977 that I have had a purpose built
outdoor antenna
for serious medium-wave DXing. In this case, under the watchful
eye and
technical guidance of Nick Hall-Patch and Walter Salmaniw,
I have
purchased a Wellbrook Flag amp and put up a trapezoidal loop
(essentially a
rectangle) 27' high and around 45' long.
The loop faces N/NW and S/SE and on
the S/SE end there is an ordinary 900
ohm resistor - called a termination. What
this termination does (and I will
leave the deep technical definitions to an
actual article on my blog) is
create a very directional, but notoriously simple
array with directional or
null characteristics of upwards of 25 to 30 db front
to back. An example
from last night: I had the AOR-7030+ connected to a
Wellbrook ALA100M
"favouring East-West"... and the Drake R8 on the freshly
minted Wellbrook
Flag (and to be fair, Nick will probably chime in and correct
me as to what
the correct name is for this loop -- because it has an inventor
-- so
credit where credit is due!)
Anyway - on 860khz (on the 7030+ was
Spanish with a bit of CBC English deep
in the background...) on the Drake R8
there was CBC Prince Rupert
profoundly in the clear with not a hint of signals
to the South.
Remarkable! One after the other examples started to pile up last
night
where I had 2 great receivers side by side hearing a
significantly
different mix of signals on the same frequency! I could not have
felt more
giddy! I now had a set-up, that by definition, might get me back in
the
game for TA reception to Europe, Alaska and Trans Pacific - to at
least
compete on some level and offer some meaningful data and intel to the
likes
of local masters, Hall-Patch and Salmaniw.
Coming up in the next
e-mail: My morning report!
--
*Colin Newell is the Editor and creator of
Coffeecrew.com
<http://www.Coffeecrew.com> - Coffee.bc.ca <http://Coffee.bc.ca>
and
DXer.ca <http://www.DXer.ca> -| Amateur Radio VA7WWV
|
Twitter.Com/CoffeeCrew | Victoria B.C.
Canada*
>>
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