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 knowwhat you are > doign I guess to use right noise levels, the rightminimum 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 nowis the MUF > is being squashed down against the ALF (absorptionlimiting frequency) , and > at low freqs, low antennas at low anglesSUCK. > > Alan, as for WHyalla to Adelaide, it's hard but it is possible 2 - 4MHz 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 Wilsonwrote: > > > There are a whole suite of tools for this viaSWS as well. Use the > http://www.sws.bom.gov.au/Category/HF%20Systems/Online%20Tools/Prediction%20Tools/HF/HF.phpand > network selection tool to model circuits betweenarbitrary global points. > > Failing that there is a huge list of isonodelocations 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> wrote: > yeahfrom that abstract, that makes sense. > > Alan, I'll send you a bunch of predictions for each hour fromSydney 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 needabout 5 > > frequencies, at least 2 simulatenous at all times, maybe3.... > > > > > * > > * > > * > > *And how many VHF repeaters do we have in our country,perhaps 300.* > > * > > * > > *Thanks for the magic diagrams, it shows that if Wyallawants to talk > > to Adelaide,* > > *with the equipment they have, HF only, then there is apath 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 ofgiving 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, needDC)* > > * > > * > > *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 !!! :-) Whatwould be > > more useful, would be say an HF gateway onto a localrepeater etc. > > *> 20m wont cover the whole country.... you'll needabout 5 > > frequencies, at least 2 simulatenous at all times, maybe3.... > > > * > > > 20m might get you 5% of the country for 4 hours perday 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 onour separate > >> thread. any questions ? > >> > > >> > The MUF is about 5 MHz max right now, what areyou expecting ? > >> > > >> > On 30/01/2019 5:29 PM, Alan Beard wrote: > >> > > >>> Hi David, Glen and Jeroen, > >>> > > >>> > 10m, the RF side concerns me, the ionosphereis just not > >>> co-operating. > >>> > > >>> > The MUF is not lifting up there so thecoverage area isn't that good. > >>> > > >>> > Hence my concentrating on 20m as a maxfrequency. Using 20m a whole > >>> > country can be covered. And it happens oftenenough, 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 100KHzsplit on 29MHz and you > >>> need about > >>> > four cubic metres!!) > >>> > > >>> > As mentioned, I've picked up the Codan 8528for 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 SupportTechnician from 1984 to today > >>> > 70 Wedmore Rd. Sun Solaris, AIX,HP/UX, Linux, SCO, MIPS > >>> > Emu Heights N.S.W. 2750 Routers, terminalservers, printers, > >>> terminals etc.. > >>> > +61 2 47353013 (h) SupportProgramming, shell scripting, > >>> "C", assembler > >>> > 0414 353013 (mobile) After uni,electronics tech > >>> > > >>> >_______________________________________________ > >>> > Freetel-codec2 mailing list > >>> > Freetel-codec2@lists.sourceforge.net > >>> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > >>> > > >>> > > >> > >> > > >> > _______________________________________________ > >> > Freetel-codec2 mailing list > >> > 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 from1984 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, shellscripting, "C", > > assembler > > 0414 353013 (mobile) After uni, electronics tech > > > > > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > > >_______________________________________________ Freetel-codec2 mailing list 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
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