Message-ID: <13cce99aa2d.marcocadeddu@tin.it>
Date: Tue, 12 Feb 2013 14:30:42 +0100 (CET)
From: "marcocadeddu@tin.it" <marcocadeddu@tin.it>
To:  <rsgb_lf_group@blacksheep.org>
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Subject: R: LF: Was  Considerations about wide DX experiments - how slow
 should we go?
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On the theory hornets cannot fly..
Let's dream again Stefan!
73, Marco IK1HSS

----Messaggio originale----
Da: hellozerohellozero@hotmail.com
Data: 12-feb-2013 4.27
A: "rsgb_lf_group@blacksheep.org"<rsgb_lf_group@blacksheep.org>
Ogg: LF: Was  Considerations about wide DX experiments - how slow=20
should we go?


I would agree Alan that on the longer hauls I still see a more rapid=20
fade pattern but not the couple of mins typical of the shorter hop=20
stuff - - I sort of got used to "20 mins" for 137Khz on the Transpolar=20
and Trans Siberian paths into China from Eu, but it was a little more=20
than "5 mins" at 500Khz - that sort of aligns on what I saw at sea on=20
the Antarctic/South Atlantic paths on 500 back to Portishead path back=20
long long ago, and what I have heard from here and Fiji into Oz and NZ=20
- but I also recall the fades became more vertical and shorter during=20
the more disturbed periods - again this way very dependant on the path=20
profile and where it and what it crossed on the Rhum line geomag and=20
whether it was North/South East West - again cutting across the "lines"=20
was far more problematic.   I still scratch my head to see the MUF map=20
of the world and how it looks more like a complicated barometric=20
pressure map with depressions and High pressure areas :-)  What I would=20
do is not to discount the long periods out of hand at 500 - I have a=20
tingly feeling that dot 30 is as slow as I would go but Ive been proved=20
wrong countless times :-) What I do know is to date that bar Japan to=20
Alaska (apart from Canada/USA) no signals have reached the levels that=20
my old CW ears could decode, and truthfully I dont think they would=20
ever get to that level at our ERP levels and lack of the salty stuff.=20
Mind you I would love to set up an MF station here on Maui - Ive=20
already picked my spot and the tower I would steal (Junction of=20
Lahaina/Kihei road at South Kihei).  Im trying to twist a certain arm=20
to install MF on our expedition ship, but we dont have a lot of space=20
for the normal type of array Im used to. We will see Laurence KL=20
1X/KH62AZT
 > From: alan.melia@btinternet.com
> To: rsgb_lf_group@blacksheep.org
> Date: Tue, 12 Feb 2013 01:09:31 +0000
> Subject: LF: Re: Considerations about wide DX experiments on 630m and=20
tonites QRSS-60
>=20
> Hi Stefan I think that maybe the right approach. I think you may find=20
that=20
> the "perceived wisdom" on fading rate v QRSS speed is based on=20
relatively=20
> short paths. I suspect it may well be very different at real DX=20
range, that=20
> is several hops.......>6000km. There obviously is some sort of a=20
problem=20
> because the wavelength is much shorter than 136kHz so the phase=20
changes more=20
> rapidly with ionisation and "apparent refection height" but you need=20
two=20
> "modes" of nearly equal strength to get extinction. This may not be=20
so=20
> prevalent at long ranges on 470kHz. The experiment will be very=20
interesting=20
> if you can start to leave traces on distant grabbers.
>=20
> Alan
> G3NYK
> ----- Original Message -----=20
> From: "Stefan Sch=C3=A4fer" <Stefan.Schaefer@iup.uni-heidelberg.de>
> To: <rsgb_lf_group@blacksheep.org>; "Vasily Savchenko" <ua0snv@yahoo.
com>;=20
> "Garry and Linda Hess" <k3siw@sbcglobal.net>; "Douglas D. Williams"=20
> <kb4oer@gmail.com>; "Andy - KU4XR" <ku4xr@yahoo.com>; "Edgar J=20
Twining"=20
> <edgarjtwining@virginbroadband.com.au>
> Sent: Monday, February 11, 2013 10:57 PM
> Subject: LF: Considerations about wide DX experiments on 630m and=20
tonites=20
> QRSS-60
>=20
>=20
> > MF !!!!!!!!!!!!!!!!!!!!!!! ;-)
> >
> > Edgar in Tasmania was recently asking if i have some plans about=20
DX=20
> > experiments on 630m. Well that is a path of > 16000 km. However we=20
do not=20
> > have real experience if that is easier than 2200m or rather=20
impossible.
> >
> > At least i know that there was not even a single decode by UA0SNV=20
in my MF=20
> > WSPR and QRSS tests so far, while it is no problem on LF (OK my MF=20
signal=20
> > is weaker than my LF signal). Thus i would guess that it is much=20
harder to=20
> > get some traces of a signal on 630m. We will try anyway!
> >
> > I'm starting to run a QRSS-60 transmission on 476.172 kHz (+- a few=20
Hz)=20
> > for the night. Maybe someone across the pond will catch something.=20
We, or=20
> > at least i still have no experience about the QSB problem on very=20
slow=20
> > QRSS transmissions on MF. It would be interesting to see a=20
spectrogram.
> >
> > On air in a few minutes.
> >
> > 73, Stefan/DK7FC
> >
> > PS: No, not only beacon transmissions, i've just had a > 1 hour=20
long CW=20
> > QSO with PA0LCE and DK6SX/p! Also contacts to OK2BVG and S57A.
> >=20
>=20
>=20
 =09=09 =09   =09=09 =20