[hfsig] HF performance under 200 miles?

Robert Bruninga bruninga at usna.edu
Mon Oct 10 18:41:49 CDT 2016


But I dont want DX ever in this app..  I want HF that works out to 250
miles during the day and not much beyond 500 miles at night.  Then, just
like WIDE1-1 on VHF, we can keep things HF local, re-use the freuqncy and
also gain 100 to one precision by not having to transmit worl-wide unique
posits, but just say 1000 mile unique.  That's the idea anyway.

I climbed up the roof to inspect my multi-band dipole and to my amazement,
all 8 legs were intact, and just drooping down in the shrubery on all
sides, so it looks like aI can gt back on HF by just a lot of rock throwing
and string...

bob, WB4APR

On Mon, Oct 10, 2016 at 11:36 AM, Mitch Winkle <mitchwinkle at gmail.com>
wrote:

> That's not always valid reasoning when it comes to HF actually, and here's
> why.
>
> Just because the "nearest" HF gate is 200 - 300 miles away doesn't mean
> that's the best one to use all the time.  NVIS communications make sense if
> you are networking around that model (such as MARS does in regional
> comms).  If you are involving alternate connectivity such as internet, RF
> distance is rather inconsequential.
>
> Case in point:  Using WINMOR for Winlink connectivity for the recent
> Virginia ARES SET, it was necessary for me to use a station in North Miami,
> FL, over 1000 miles away in order to gain access to the network reliably on
> HF.  Now the same could be said for HF APRS as well.  Why worry about the
> distance at all?  Designate a frequency on each band and be happy.
> Scanning is commonplace for many types of networking tools such as packet,
> ALE and Winlink systems.
>
> To try to provide a direct answer to your question though, an overall high
> availability data only band like 30m (which is already the target for many
> using APRS) makes a lot of sense.  It's long-regional flavor spans not only
> NVIS on it's edge days of propagation, but good sky wave as well, and solid
> overnight performance for many hundreds of miles.  It is common to have
> trans-Atlantic QSO's in the dark also.
>
> "What frequency should I use on HF?" is one of the most asked questions in
> all of Amateur Radio.  The answer is almost always the same.  "The one that
> works today."
>
> --
> Mitch Winkle
> http://ewamjlu.blogspot.com
> ...How long will you go limping between two different opinions? If the
> LORD is God, follow him...
> 1 Kings 18 ESV
>
> On Mon, Oct 10, 2016 at 9:44 AM, Robert Bruninga <bruninga at usna.edu>
> wrote:
>
>> For under say 200 miles, what is the best band round the clock?
>>
>> Given that a 1 Watt WSPR transmitter performs as if it was 1000W due to
>> processing gain, couldn't it punch through the day time noise?
>>
>> And APRS only has to go say 200 miles to the nearest HFgate to provide
>> almost total coverage of the USA because every where is within 200 miles of
>> a city where maybe a ham will be running an HF gate?
>>
>> So that is the question.  Forget the high noise levels... WSPR can work
>> through that.  what band will provide the connectivity 24/7/364 over that
>> 200 to 300 mile range?
>>
>> Bob
>>
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>
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