[hfsig] HF performance under 200 miles?

Scott Laughlin n7net at yahoo.com
Tue Oct 11 11:27:57 CDT 2016


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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