[SADXA] 40m DAY DX of a Yagi vs K07SS CW Skimmer on a Dipole - Dec. 2nd

[W7EXG (Bill)]

Hi Jim, 

Thanks so much for your report. 

Since you know Bill, I think it would be great for him to speak to our
group, regarding his skimmer operation. As a DX Club, the use of a
"backyard" skimmer at 8000 feet clearly has some value. Perhaps Don or
others could second the motion. 

I certainly agree with your low angle argument. Most 40m take off angles are
about 24 degrees, but who knows how this changes for RECEIVING 40m DX?
Sounds like a nice research paper. 

I do live way on the West side, where the Mt Lemon peak angle is about 5
deg. So for some, these mountains to EU are not an issue as you mentioned. 

What intrigued me was the 40m DX CW CQs I did observe and record here
yesterday [received on my 3 ele yagi] between 2145z and 2245z was not
recorded at all on the KO7SS CW skimmer. 

Thus, just because the skimmer is NOT recording the 40m DX, does NOT mean it
is not present and workable. However, if KO7SS does record 40m DX, it is
likely that many in Tucson could possibly work this DX, not withstanding the
limitations you cited. 

Thanks for your input.

73's
Bill W7EXG
-----Original Message-----
From: sadxa-bounces at mailman.qth.net [mailto:sadxa-bounces at mailman.qth.net]
On Behalf Of Jim Wysocki
Sent: Monday, December 02, 2019 9:31 PM
To: sadxa at mailman.qth.net
Subject: Re: [SADXA] 40m DAY DX of a Yagi vs K07SS CW Skimmer on a Dipole -
Dec. 2nd

Bill, you'll need to take the KO7SS skimmer spots with a grain of salt.  
Just because they log a call doesn't mean that some of our members will 
be able to hear it.

I recently was over to Bill's place on Mt. Lemmon where he has the 
skimmer and the dipoles. The antennas are near the top of the mountain, 
about 45 feet above the terrain, and with the one I saw having a clear 
view towards Europe.  I don't recall seeing a second antenna but it 
could have been there.  The net effect of the extra work is that Bill's 
skimmer can hear some of the stations that he can't copy down at his QTH 
in the city.  So if somebody is well-situated, i.e., far enough away 
from the mountains that the low angled signals can be received, he 
should be able to hear some DX that others of us who are too close to 
the mountains can't even detect.

73, Jim  W9FI

On 12/2/2019 6:45 PM, W7EXG (Bill) wrote:
> The following 40m DAY DX was heard CALLING CQ in Tucson Dec. 2nd, from
about
> 2145z to 2245z on my DB42 3 ele 40m Yagi on a 42 foot boom.
>
> ON4YOTA
> ON6DC
> F6BII
> R7DC
> CT9/DL5AXX
> CT1ZQ
> SP9FV
>
> The following 40m DAY DX was heard CALLING CQ in Tucson Dec. 2nd, from
2145z
> to 2245z on KO7SS CW skimmer dipoles.
>
> NONE of the above.
>
> Although K07SS did not record the above 40m DX, it has recorded in the
past
> 40m DAY DX in this time frame. Thus, 40m DAY DX is still quite possible
with
> a dipole. Such 40m DAY DX has already been recorded here on dipole type
40m
> antennas.
>
> 73'S
> BILL W7EXG
>
>
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