[hfsig] HF performance under 200 miles?

Mitch Winkle mitchwinkle at gmail.com
Tue Oct 18 06:51:20 CDT 2016


Why would you winder that??

Mitch

On Oct 11, 2016 12:31 PM, "Scott Laughlin" <n7net at yahoo.com> wrote:

> I wonder if Mitch has a call sign?
>
> Regards, Scott/n7net
>
> Sent from my iPad
>
> On Oct 11, 2016, at 8:20 AM, Mitch Winkle <mitchwinkle at gmail.com> wrote:
>
> 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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