*Hi Glen,*
*
*
*So, do I get this right?*
*
*
*It's 4pm Sydney time and the HAP chart from Perth shows a band of the
12 and 14MHz regions going in a circle from*
*Darwin to Melbourne and all the east coast of Australia.*
*http://www.sws.bom.gov.au/HF_Systems/1/1/1*
*
*
*HOWZAT (an Australian cricket term)*
*
*
*And yes, I built (at Hankins, Newcastle) the HOWZAT pinball machines
in about 1979.*
*
*
*40m here in the Sydney suburbs is too noisy, my neighbour's solar
system, one side and the inverter air-conditioner the other,*
*30m is not bad. 20m quite OK.*
*
*
*To Glen,*
*
*
*I tried the link below and port 443 (HTTPS) was a no-go somewhere.*
*
*
*Alan VK2ZIW*
*
*
*On Thu, 31 Jan 2019 09:54:28 +1100, glen english wrote*
> Hi Sam
> good point, this is all available online. But you got to know what
you are doign I guess to use right noise levels, the right minimum
angles, the suitable antennas, power SNR etc
> I have place some BUF plots at
> https://cortexrf.com.au/alanspreds.html
> sooooo antenna and noise dependent..... what's happenign right now
is the MUF is being squashed down against the ALF (absorption limiting
frequency) , and at low freqs, low antennas at low angles SUCK.
>
> Alan, as for WHyalla to Adelaide, it's hard but it is possible 2 - 4
MHz with dipoles at each end, but usually not whips at each end.
>
> that's why they put HF bases in the middle of nowhere of course....
>
> On 31/01/2019 9:09 AM, Sam Wilson wrote:
>
>
> There are a whole suite of tools for this via SWS as well. Use the
http://www.sws.bom.gov.au/Category/HF%20Systems/Online%20Tools/Prediction%20Tools/HF/HF.php
and network selection tool to model circuits between arbitrary global
points.
>
> Failing that there is a huge list of isonode locations to pick from
for HAP modelling at http://www.sws.bom.gov.au/HF_Systems/1/1/1
>
> Cheers,
>
> Sam
> VK2GPL
>
> On Thu, 31 Jan 2019 at 08:33, glen english <g...@cortexrf.com.au
<mailto:g...@cortexrf.com.au>> wrote:
>
yeah from that abstract, that makes sense.
>
> Alan, I'll send you a bunch of predictions for each hour from
Sydney is
> it or the Gong ?
>
> g
> On 31/01/2019 6:36 AM, Alan Beard wrote:
> > *Hi Glen and all,*
> > *You wrote:*
> > *
> > *
> > *
> > > 20m wont cover the whole country.... you'll need about 5
> > frequencies, at least 2 simulatenous at all times, maybe 3....
> > >
> > *
> > *
> > *
> > *And how many VHF repeaters do we have in our country,
perhaps 300.*
> > *
> > *
> > *Thanks for the magic diagrams, it shows that if Wyalla wants
to talk
> > to Adelaide,*
> > *with the equipment they have, HF only, then there is a path
via a
> > repeater, if it were a skip distance away.*
> > *
> > *
> > *Does this make sense?*
> > *
> > *
> > *I aim to (well one is running now) start the process of
giving this a
> > try.*
> > *
> > *
> > *So, I'm asking, what frequencies would you suggest?*
> > *
> > *
> > *The Codan to be used will do 2 to 14MHz USB or LSB. (there
are more
> > Codans available)*
> > *
> > *
> > *80 (not 73, the 80 is a problem solver, have AC, need DC)*
> > *
> > *
> > *Alan VK2ZIW*
> > *
> > *
> > *
> > *
> > *On Wed, 30 Jan 2019 18:06:09 +1100, glen english wrote*
> > > But ALan'you dont actually need a repeater on HF... the
repeater is
> > already up there- it's called the Ionosphere !!! :-) What
would be
> > more useful, would be say an HF gateway onto a local repeater
etc.
> > *> 20m wont cover the whole country.... you'll need about 5
> > frequencies, at least 2 simulatenous at all times, maybe 3....
> > > *
> > > 20m might get you 5% of the country for 4 hours per day
right now
> > >
> > > here you go ..
> > > see below :
> > > likely coverage at 9 in the morning, a guide... there are a
few
> > assumptions due to the variability of station/terminals.
> > >
> > > coverage at 5pm :
> > >
> > > coverage on only 20m at noon.
> > >
> > > On 30/01/2019 5:40 PM, glen english wrote:
> > >
> >> So Alan
> >> >
> >> > didnt get a reply to my last cavity question on our separate
> >> thread. any questions ?
> >> >
> >> > The MUF is about 5 MHz max right now, what are you
expecting ?
> >> >
> >> > On 30/01/2019 5:29 PM, Alan Beard wrote:
> >> >
> >>> Hi David, Glen and Jeroen,
> >>> >
> >>> > 10m, the RF side concerns me, the ionosphere is just not
> >>> co-operating.
> >>> >
> >>> > The MUF is not lifting up there so the coverage area
isn't that good.
> >>> >
> >>> > Hence my concentrating on 20m as a max frequency. Using
20m a whole
> >>> > country can be covered. And it happens often enough, even
daily
> >>> for hours.
> >>> >
> >>> > Thanks Jeroen for the networking thoughts, as Full Duplex
from one
> >>> site
> >>> > on HF is realistically not possible.
> >>> >
> >>> > (I've looked at cavity designs for 100KHz split on 29MHz
and you
> >>> need about
> >>> > four cubic metres!!)
> >>> >
> >>> > As mentioned, I've picked up the Codan 8528 for a Codec2
repeater.
> >>> >
> >>> > Playing some more with the Hybrid Ring:
> >>> >
> >>>
http://www.unixservice.com.au/hamradio/repeaters/duplexers/hybridRing/dup6mHR.
> >>>
> >>> > html
> >>> >
> >>> > Alan VK2ZIW
> >>> >
> >>> > Evil flourishes when good men do nothing.
> >>> > Consider the Christmas child.
> >>> >
> >>>
---------------------------------------------------------------------------
> >>>
> >>> > Alan Beard Unix Support Technician from
1984 to today
> >>> > 70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux,
SCO, MIPS
> >>> > Emu Heights N.S.W. 2750 Routers, terminal servers,
printers,
> >>> terminals etc..
> >>> > +61 2 47353013 (h) Support Programming, shell
scripting,
> >>> "C", assembler
> >>> > 0414 353013 (mobile) After uni, electronics tech
> >>> >
> >>> > _______________________________________________
> >>> > Freetel-codec2 mailing list
> >>> > Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
> >>> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
> >>> >
> >>> >
> >>
> >> >
> >> > _______________________________________________
> >> > Freetel-codec2 mailing list
> >> > Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
> >> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
> >> >
> >> >
> >
> >
> >
> > Alan
> >
> > Evil flourishes when good men do nothing.
> > Consider the Christmas child.
> >
---------------------------------------------------------------------------
> >
> > Alan Beard Unix Support Technician from 1984 to
today
> > 70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO,
MIPS
> > Emu Heights N.S.W. 2750 Routers, terminal servers, printers,
> > terminals etc..
> > +61 2 47353013 (h) Support Programming, shell
scripting, "C",
> > assembler
> > 0414 353013 (mobile) After uni, electronics tech
> >
> >
> >
> >
> > _______________________________________________
> > Freetel-codec2 mailing list
> > Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>
> _______________________________________________
> Freetel-codec2 mailing list
> Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
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>
>
>
>
>
_______________________________________________
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Alan
Evil flourishes when good men do nothing.
Consider the Christmas child.
---------------------------------------------------------------------------
Alan Beard Unix Support Technician from 1984 to today
70 Wedmore Rd. Sun Solaris, AIX, HP/UX, Linux, SCO, MIPS
Emu Heights N.S.W. 2750 Routers, terminal servers, printers,
terminals etc..
+61 2 47353013 (h) Support Programming, shell scripting, "C",
assembler
0414 353013 (mobile) After uni, electronics tech
_______________________________________________
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