[OKDXA] Propagation to Amsterdam Island DXpedition

[John Geiger]

Thanks for running that Roger.  I was unaware how much beam headings varied 
for different parts of OK.  I was able to find VOCAP and run some 
predictions. It does appear that with a SSN of 60 (which is was VOCAP was 
assuming for January) there are some short openings on 15.  20 and 30 appear 
to be the best.  30m is the one time I was able to hear FT5XO when they were 
there.  Unfortunately I didnt work them, though.

73 John AF5CC
----- Original Message ----- 
From: "Roger Simpson" <rksimpson1 at cox.net>
To: "Oklahoma - DX news and information" <okdxa at mailman.qth.net>
Sent: Wednesday, November 20, 2013 2:16 AM
Subject: [OKDXA] Propagation to Amsterdam Island DXpedition


> John AF5CC [and other OKDXA members]:
>
> You asked about whether it is worth putting up a 15m beam to work the 
> Amsterdam operation.
>
> My answer is YES, especially if you don’t have a beam for either 20, or 
> 17m.
>
> FROM LAWTON OK:
>
> Latitude North 34.6375
> Longitude West 98.4375
>
> Short Path:  Azimuth = 135 deg;  Distance = 12130 miles    best openings 
> on 20m, 17m, 15m
>
> Long Path:  Azimuth =  315 deg;  Distance = 12753 miles    best openings 
> on 20m, and 15m (17m is “marginal”)
>
> The above calculations are from www.voacap.com
>
> Note: Normally propagation to any DX location in AS, EU, AF, SA, or OC is 
> the “same” from anywhere in Oklahoma.
> However, this is NOT the case for Amsterdam Island because here in 
> Oklahoma we are VERY CLOSE to being at the opposite side
> of the earth from Amsterdam. So the headings to Amsterdam vary a lot 
> depending upon where you
> are in Oklahoma.  And since the headings vary – the path to Amsterdam is 
> different – and thus the propagation is different.
>
> There is the only one DXCC location that is on the opposite side of the 
> earth from somewhere in the lower 48 states of the USA.
> That DX location is Amsterdam Island. The place in the 48 states where the 
> antipode to Amsterdam Island is located is in SE Colorado.
>
> This gives you an idea of how much difference there is in the headings for 
> the short path to FT5ZM:
>
>  From Tulsa OK          110 degrees   short path
>  From Boise City OK   182 degrees   short path
>
> I am going to publish beam headings from various places in Oklahoma to 
> Amsterdam on this reflector in a few days. I will also give the exact 
> coordinates
> of the antipode point which is in Southeast Colorado. And I’ll give you 
> driving directions so you can visit the antipode location in Colorado up 
> close and
> personal if you don’t mind a few dirt roads.
>
>
> 73  Roger   K5RKS
>
>
>
>
>
>
>
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