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

[Jim Wysocki]

Today I spoke to Bill about doing a "remote operation" presentation to 
us.  He can't because he works every Thursday from 8 to 8, and thus can 
never make one of our meetings.  However he's willing to show his 
operation from his home in the city to anyone who's interested.

73,  Jim

On 12/3/2019 11:08 AM, W7EXG (Bill) wrote:
> 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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