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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:
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
>>> > [email protected]
>>> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>>> >
>>> >
>>
>> >
>> > _______________________________________________
>> > Freetel-codec2 mailing list
>> > [email protected]
>> > 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
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
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