[hfsig] HF performance under 200 miles?

Mitch Winkle mitchwinkle at gmail.com
Tue Oct 11 08:20:55 CDT 2016


DX is hardly evil as long as the results are achieved.  Your project, your
decision...my 2 cents.

Mitch

On Oct 10, 2016 9:37 PM, "Robert Bruninga" <bruninga at usna.edu> wrote:

> 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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>
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