From: Mark Durenberger<Mark4@xxxxxxxxxxxxxxx>
Subject: Re: [NRC-AM] [IRCA] Building a "state of the art" MW DX station
To: am@xxxxxxxxxxx
Cc: "Mailing list for the International Radio Club of America"<irca@xxxxxxxxxxxxxxxx>
Date: Monday, January 2, 2012, 8:19 PM
About 4:1 ratio should work.
Most folks like to roll their own but you can
also try:
http://www.minicircuits.com/products/Transformers.shtml
Should work if you're not near any high RF fields
Regards,
Mark Durenberger
--------------------------------------------------
From: "Les Rayburn"<les@xxxxxxxxxxxxxxxx>
Sent: Monday, January 02, 2012 6:39 PM
To: "Mark Durenberger"<Mark4@xxxxxxxxxxxxxxx>
Cc: "DX @NRC"<am@xxxxxxxxxxx>;
"Mailing list for the International Radio
Club of America"<irca@xxxxxxxxxxxxxxxx>
Subject: Re: [NRC-AM] [IRCA] Building a "state of the art"
MW DX station
Mark,
Excellent points regarding the change in "mindset"
when using a SDR
receiver. Hadn't really thought it about it that way.
I might be able to erect a "fold over" vertical
antenna that I could
deploy only during listening sessions. Assuming
something like 30 feet
in length, what would I need for a matching
transformer?
Les Rayburn, Director
High Noon Film
130 1st Avenue West
Alabaster, AL 35007-8536
(205) 621-7500
(205) 621-7505 FAX
(205) 253-4867 CELL
http://www.highnoonfilm.com
On 1/2/2012 6:23 PM, Mark Durenberger wrote:
Hi Les...good for you!
As a general comment addressing two of your
questions: The "real" SDR
is a tool you'll fall in love with.
However...you'll have to make
somewhat of a tradeoff from the original way of
thinking. We've all
used loops to pinpoint and tune a specific
frequency. That's sort of
counter-productive when you're using an SDR to
capture the entire band
because you usually don't want to favor a unique
channel.
So if you're doing wideband with SDR you're
probably going to want to
do a Beverage or a vertical. Sounds like a
Beverage is out for you.
I've had tremendous luck with a 30-foot vertical
and a Perseus SDR.
No amplification needed; just a matching
transformer.
It also sounds like you expect a lot of local
noise. So you'll
probably want to look at a real noise-cancelling
antenna.
Google Dallas Lankford's vertical antennas and
some of Mark Connelly's
work.
Regards,
Mark Durenberger
--------------------------------------------------
From: "Les Rayburn"<les@xxxxxxxxxxxxxxxx>
Sent: Monday, January 02, 2012 6:02 PM
To:<am@xxxxxxxxxxx>;
<irca@xxxxxxxxxxxxxxxx>;
<Tvfmdx@xxxxxxxxxxxxxxxx>
Subject: [IRCA] Building a "state of the art" MW
DX station
iAfter an absence from medium wave dxing due
to a move to a new
deed-restricted QTH, I find myself itching to
get serious again.
While my present home is far from idea (HOA,
and high local noise
levels), I'm determined to make the best of
it.
Presently, I have the following equipment
available for us:
Icom 746 Pro transceiver
RF Space SDR-IQ receiver
Wellbrook AL-1530 Loop antenna
Radio Plus Quantum Phaser
LF Engineering M-601C Active Whip antenna
LF Engineering H-800 Active Whip antenna
LF Engineering N-300 Group loop isolator
My questions are numerous, but here are the
general ones:
1.) To build a state of the art system, would
you recommend
up-grading the SDR-IQ to the Perseus or new
WinRadio SDR?
2.) Are there active whip antennas that
perform better than the LF
Engineering models? (I have mounted these to
my roof vents, painted
them black--and so far, no complaints from the
neighbors.
3.) I have a undeveloped drainage ditch next
to my home that offers
the possibility of a beverage on the ground
antenna that would run
N/S for 500-800 feet. What couplers would you
recommend for this use?
4.) Anyone tried the LF Engineering M-607
Active Loop antenna? Pricey
at $390 but perhaps worth it?
5.) Any other station accessories that would
improve things for me?
Primary interest is in domestic MW DXing,
though I don't mind logging
TA signals when they "in" (rare here). Love to
DX stations in the
Western part of the country most of all.
Thanks for the advice, and 73,
Les Rayburn, N1LF
Alabaster, AL (Near Birmingham)
--
Les Rayburn, Director
High Noon Film
130 1st Avenue West
Alabaster, AL 35007-8536
(205) 621-7500
(205) 621-7505 FAX
(205) 253-4867 CELL
http://www.highnoonfilm.com
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