Re: [IRCA] Cape Perpetua, Oregon Cliffside DXing - Sept. 9th

[Guy Atkins <dx@xxxxxxxxxxxxx>]

Hi Steve,

Thanks for your comments.

I was using that article by Nick and John as my reference for the
transformer winding throughout the project. My first version of the
windings (fewer turns, same ratio) was in the overlapping style, which I
usually use for broadband transformers. I cannot remember now why I changed
the style to separated windings for the final version I'm using. Maybe I
read something else on the web that was more persuasive regarding the
capacitive coupling issue. In any case the side by side winding is an
exception for me and I might go back to the overlapping style I've used on
other broadband transformers.

I parked along the cliff with the roof top antenna's windings oriented due
west, so that I could catch DU and TP signals equally. The  reception lobes
of a ferrite loop are very broad with a narrow null aperture so I felt it
was a "safe" bet to split the difference. There's very little room
to maneuver on the cliff anyway <g>

This morning I finished capturing my third day of Perseus recordings at the
cliff, but I may be delayed for a few days reviewing them and logging the
DX. The reception from the cliff continues hopping with activity and the
antenna is quite sensitive for even the weakest signals that are
propagating. If I can, tomorrow I'm going to record a few minutes from near
sea level, and then drive to the cliff for comparisons. If I do it early
enough--before changing conditions at dawn-- the <10 minutes between
recordings might prove interesting.

73,

Guy Atkins
Puyallup, WA

------------------------------
> Date: Mon, 10 Sep 2012 20:17:20 -0700
> From: Steve Ratzlaff <ratzlaffsteve@xxxxxxxxx>
> To: Mailing list for the International Radio Club of America
>         <irca@xxxxxxxxxxxxxxxx>
> Subject: Re: [IRCA] Cape Perpetua, Oregon Cliffside DXing - Sept. 9th
> Message-ID: <504EAD40.3090501@xxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> 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
>
>
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