[SFDXA] FT4TA

[Ronald Swanson]

Don,

google  W6ELprop  GREAT site gives you up to date propagation from your QTH
to any place on earth

                                                                    Good
Luck,   Ron W4BP

On Tue, Oct 7, 2014 at 9:11 PM, Ed Callaway <ed at sunrisemicro.com> wrote:

> Don,
>
> It actually looks pretty promising.  I don't have a model for the 2-el
> vertical dipole arrays they will be using on the higher bands, so I punted
> and just used a single 5/8th-wavelengh vertical transmitting antenna on
> their end for what I hope is a conservative alternative.  They say they
> will be using amplifiers, so I used 500 W Tx power, which VOACAP
> automatically cuts down to 400 W, due to assumed feedline loss.  (It's
> about 1 dB.)  I also assumed SSB.  On our end I assumed a 3-el. Yagi at 50
> feet.
>
> According to VOACAP, under the above assumptions the bands should be open
> around these times, short path:
>
> 10m:  1200-2100z
> 12m:  1400-2200z
> 15m:  1800-2300z
> 17m:  2030-2330z
> 20m:  2230-0100z
>
> 10 and 12m should be the most reliable, believe it or not.  (The SSN used
> was 67, which seems reasonable.)  If you're running barefoot, I would start
> at 10m and work down.
>
> Note the interesting property that 10m opens before 12m, which opens
> before 15m, which opens before 17m, which opens before 20m.  I guess if
> there's a 6m opening, it'll be at dawn.  :-)  For CW, or better-equipped
> stations, the "lower" bands actually will open somewhat earlier than I show
> here -- the signals just won't be strong enough for SSB until later in the
> day.
>
> I checked long path, just out of curiosity; VOACAP predicts a short (~30
> minute) long path opening around 1400z for 12 and 10m.  It's always
> something to check, but I think I would keep my money on the short path for
> this one.
>
> For the lower bands (http://sunrisesunset.com is your friend -- run by a
> guy in Vero Beach)...
>
> On Tromelin, midway through the DXpedition (5 November):
>
> SR = 0144z
> SS = 1427z
>
> On the same day in Ft. Lauderdale:
>
> SR = 1132z
> SS = 2237z
>
> ...So the period of common darkness is 2237 - 0144z.  SR at Tromelin will
> be around 8:45 PM EST, so by 9 PM or so it'll be over (well, 20 and 30m
> might still be open for a bit) and we can all get some sleep before we
> start again on 10m at 7 AM the next day.  Very convenient, actually, for a
> Top-Ten Most-Wanted Entity -- no 2 AM wake-up calls for this one.  The
> biggest difficulty might be working through an EU wall; as far as I can
> see, when the bands are open to us, they will also be open to EU.
>
> Of course, this is like predicting the weather a month in advance; one
> really predicts the climate, but what weather we'll actually get, nobody
> knows.
>
> Best of luck!
>
> Ed N4II.
>
> -----Original Message-----
> From: SFDXA [mailto:sfdxa-bounces at mailman.qth.net] On Behalf Of Donald
> Drennon
> Sent: Tuesday, October 07, 2014 6:30 PM
> To: SFDXA
> Subject: [SFDXA] FT4TA
>
> Can someone who is much better at propagation prediction than I run the
> times and percentages for on say 40-10 M, FT4TA to here? I think the dates
> are October 30 - November 10
>
> Many thanks,
> Don
> N4TZH
>
> Sent from my iPad mini
> ______________________________________________________________
> South Florida DX Assoc. "SINCE 1974"
> "OUR 40th ANNIVERSARY!"
> SFDXA WebSite: http://www.SFDXA.com
> SFDXA Repeater 147.33+ 103.5 Tone
> To Post: mailto:SFDXA at mailman.qth.net
> To UNSUBSCRIBE: http://mailman.qth.net/mailman/listinfo/sfdxa
> This list hosted by: http://www.qsl.net
> ______________________________________________________________
> South Florida DX Assoc. "SINCE 1974"
> "OUR 40th ANNIVERSARY!"
> SFDXA WebSite: http://www.SFDXA.com
> SFDXA Repeater 147.33+ 103.5 Tone
> To Post: mailto:SFDXA at mailman.qth.net
> To UNSUBSCRIBE: http://mailman.qth.net/mailman/listinfo/sfdxa
> This list hosted by: http://www.qsl.net
>