[SADXA] Attachment -- RE: 40m F layer Propagation DX Corridor Graphic for TUCSON - From W7EXG
W7EXG (Bill)
W7EXG at q.com
Thu Dec 8 12:45:23 EST 2016
Larry,
I was aware of the Reflector attachment issue, and is the reason I did not
post on our SADXA Reflector.
I sent email and attachment to you, assuming it possible to use your SADXA
email mailing list, unless there is some issue with this as well?
The 40m F-Layer DX map sent to SADXA was for Tucson Bearing. (Not Phoenix)
I have forwarded a revised Map for Phoenix bearing, to Lee [KY7M] for
distribution to the CADXA group.
Best 73s, and thanks for trying.
Bill W7EXG
-----Original Message-----
From: SADXA [mailto:sadxa-bounces at mailman.qth.net] On Behalf Of Larry Brown
Sent: Thursday, December 08, 2016 1:24 AM
To: Larry Brown
Subject: [SADXA] FW: FW: 40m F layer Propagation DX Corridor Graphic
forPhoenix - From W7EXG
To everyone on the list. The Map was forwarded by my computer but was
missing when I ( and apparently everyone else) received the message.
Current guess is that the club's mail reflector strips any attachments. I
will try and think about this tomorrow to see if there is a work-around.
73,
Larry Brown, W7LB
SADXA Secretary/Treasurer
-----Original Message-----
From: SADXA [mailto:sadxa-bounces at mailman.qth.net] On Behalf Of Bill Maynard
Sent: Wednesday, December 07, 2016 2:12 PM
To: Southern AZ DX Association E-Mail Reflector
Subject: Re: [SADXA] FW: 40m F layer Propagation DX Corridor Graphic for
Phoenix - From W7EXG
I didn't receive the map ??
Bill W7ZT Mesa
> On Dec 7, 2016, at 12:56 AM, Larry Brown <w7lb at earthlink.net> wrote:
>
>
>
>
>
> From: Bill Davis [mailto:billdav8 at q.com]
> Sent: Tuesday, December 06, 2016 7:14 PM
> To: W7LB
> Subject: 40m F layer Propagation DX Corridor Graphic for Phoenix -
> From W7EXG
>
>
>
> Hi Larry,
>
>
>
> Attached is a graphic I presented to the SADXA Group, on the 40m F
> layer Propagation Corridor. Can you please distribute this email and
> attachment to the SADXA Group, as they may find value, especially in
> the next 4 to 6 weeks. I think you have the
> distribution list.
>
>
>
> Thanks!! Bill
>
>
>
> TO: SADXA Group
>
> FROM: Bill Davis W7EXG
>
>
>
> Although the attached graphic was developed in My Oct. 20th
> presentation, I will quickly summarize for those who may not have
> attended.
>
>
>
> Here are the Key Points:
>
>
>
> A. 40M DAY DX can Occur in the F layer when EMUF < 7.0 MHz < MUF.
>
> B. After Sunrise, the EMUF builds slowly, allowing 40m F layer
> DAYTIME DX along the Terminator, until EMUF exceeds 7.0 MHz.
>
> C. Prior to Sunset, the EMUF decays slowly, allowing 40m F layer
> DAYTIME DX along the Terminator, after EMUF decreases below 7.0 MHz.
>
> D. Although the TIME and DISTANCE for 40m F-Layer Propagation is
> Latitude dependent, trans-equatorial propagation is limited at the
> Equator to about 2.6 Hrs, or a 40m F-Layer DX DAY Corridor distance of
> about 2600 mi.
>
> E. Although this propagation would appear to be a 40m Day-Time DX
> Corridor, a 40m Long Path into the DARK side of the Terminator will
> also emerge from the Antipode into the Long Path 40m DAY region,
> taking advantage of the 40m Day Corridor.
>
> F. In order to keep the 40m DX signals within the +/- 2600 mi
> Propagation Corridor (and low EMUF DAY region), the Great Circle
> Bearing should be within +/- 38 Degrees of the Sunrise and Sunset
> Terminator.
>
> G. Since the Terminator varies every day, [annually changes +/-
> 23.45 degrees], and the 40m Propagation Corridor changes +/- 38
> degrees about the Terminator, then the angular region of the +/- 40m
> Propagation DX Corridor is changing every day.
>
> H. The Bearing Map shows two Terminators.
>
> a. One Terminator at +23 degrees occurs at SR for Dec. 21st, or
> SS for June 21st.
>
> b. The Second Terminator is at -23 degrees (337 deg) for SS for
> Dec 21st, and SR for June 21st.
>
> c. The Equinox terminators on 3/21 and 9/21 are not shown, but
> both SR and SS Terminators would be shown as a 0 deg to 180 deg line.
>
>
>
> HOW TO READ THIS MAP.
>
>
>
> Note on Dec. 21st, the SR terminator is +23 deg. Thus, the 40m
> F-layer DX propagation angular range is from 345 deg to 61 deg.
> (or 241 deg to 165 deg)
>
> (Note this covers N/E Africa, EU, and Asia and ZL land)
>
>
>
> Note on Dec. 21st, the SS terminator is -23 deg (or 337 deg).
> Thus, the 40m F-layer DX propagation angular range is from 299 deg
> to 15 deg. (or 195 deg to 119 deg)
>
> (Note this covers the Far East, Asia, and South America)
>
>
>
> Note the Angular Range for Dec. 21st, covers 68% of the World, and
> represents the 40m F-Layer DX Opportunity for ONE DAY.. Dec. 21st.
>
>
>
>
> The Same 40m opportunity occurs on June 21st.
>
>
>
> Thus, in the Next 4 week time period, there will be an excellent
> opportunity for 40m DX 2.6 Hours before and after the Terminator,
> at SUNRISE and SUNSET.
>
>
>
> I KNOW I DID NOT SAY THERE WOULD BE A QUIZ, BUT THERE IS!!
>
>
>
> QUESTION: WHAT DOES THE CIRCULAR CIRCUMFERENCE OF THIS BEARING MAP
> REPRESENT?
>
>
>
> Good Luck with the MUF (> 7.0 MHz) for whatever bearing you chose.
> Path MUF is not always co-operative.
>
>
>
> Hopefully, someone will get their 40m DX awards in the next 4
> weeks, by hanging out at the Terminators. There will be much to
> hear during this time frame, and perhaps not just on 40m.
>
>
>
> You may recall, we worked HEARD on 4/2 after Tucson SS to 4:30Z.
> Bands worked were 40mLP, 30m, 20m, and 17m SP.
>
>
>
> Best 73s,
>
>
>
> Bill W7EXG
>
> W7EXG at Q.COM
>
>
>
>
>
> ---
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