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Re: [IRCA] Cape Perpetua, Oregon Cliffside DXing - Sept. 9th
- Subject: Re: [IRCA] Cape Perpetua, Oregon Cliffside DXing - Sept. 9th
- From: Steve Ratzlaff <ratzlaffsteve@xxxxxxxxx>
- Date: Mon, 10 Sep 2012 20:17:20 -0700
Thanks for the very interesting report on the untuned FSL and preamp.
You didn't say but apparently you parked so the FSL was peaked/pointed
for maximum pickup toward the North Pacific. You might have had better
DU reception if it had been pointed the DU direction. Looking at your
pictures, your transformer would work better as a broadband transformer
if the windings were overlapping instead of side by side. The impedance
matching transformer articles by Nick Hall-Patch and John Bryant at
dxing.info explain this. I've done my own tests and overlapping windings
always work better for broadband toroid transformers. (It's possible the
small impedance transformation doesn't do much too, but it probably
doesn't hurt much either, if at all.)
73 and hope you continue to have good coastal vacation DXing.
Steve
NE Oregon
On 9/10/2012 6:00 PM, Guy Atkins wrote:
Yesterday morning before sunrise I sought out the Cape Perpetua, Oregon
cliff that has served Gary DeBock so well with a flood of DU DX with his
Ferrite Sleeve Loop (FSL) antenna.
With Gary's encouragement and supply of a regular tuned FSL, and Chuck
Hutton's help with electrical formulas and initial impedance measurements,
I was able to convert the FSL into a broadband (non-tuned) loop for
capturing the entire band with Perseus SDR recordins. The antenna
accompanied me to Oregon, secured inside a container strapped to the roof
of our family's vacation vehicle.
The 7-inch FSL was converted to broadband use by the removal of the tuning
capacitor and the addition of a homebrew 1.6 to 1 turns ratio transformer
and a Wellbrook FLG100LN amplified Flag antenna module. (FSL >> 26/15 turns
on Amidon FT140A-J core >> input of FLG100LN >> receiver. Chuck calculated
the FSL's impedance as 3K ohms at 1.7 MHz; the Wellbrook's input impedance
is 1200 ohms.)
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