[Elecraft] “ELECRAFT NVIS field day”

John Simmons jasimmons at pinewooddata.com
Sat Dec 18 11:07:36 EST 2021 

For 80M NVIS I put up a 'improved' extended double Zepp (315' long 
designed by N6LF) at 30' with a wire reflector 5% longer buried an inch 
in the ground. There is a 4:1 balun at the center with a coax feedline 
to the shack. Covers entire band under 2:1 SWR. Email for more details 
if desired.


-- 
73,
-de John NI0K in rural Debs, MN USA
Hamshack Hotline: 6100000271

email wrote on 12/18/2021 9:10 AM:
> I put up an NVIS antenna for 80m a number of years ago.  It works 
> great for local 80m nets.
> It is a full wave length loop (more square) mounted about 10' above 
> the ground.
> It is feed with 450 ohm ladderline from a 1:1 current balun at the ATU.
> EZNEC shows the radiation is UP.
> It also shows gain and not as much UP on 40m and 20m.
> I have worked DX on all bands.
>
> 73, steve WB3LGC
>
> On 12/18/21 4:09 AM, Ken WA8JXM wrote:
>> --- "In Hawaii, 40 meters worked great for NVIS probably 11 out of 12
>> months a year. Someone else who knows can comment, but I got the 
>> impression
>> that 40 meters almost never works for NVIS in the mainland US.  If 
>> this is
>> true, an Elecraft NVIS field day might be limited to those who either 
>> have
>> room for an 80 meter dipole, or who can devise some other kind of 80 
>> meter
>> antenna that can radiate up."
>>
>>
>> I think it depends on time of day, time of year, and what part of the
>> sunspot cycle.  40m is pretty much the top limit for NVIS though. But
>> sometimes 40 works for NVIS.  That's one of the reasons for our 60m
>> allocation, NVIS when 40 is too  long and 80m is dead.   OTOH  I've seen
>> 160 too long for statewide coverage at times.
>>
>> FWIW, I agree a vertical is not an NVIS antenna.  Some people may be
>> confusing groundwave (usually up to 25 miles) with NVIS.  They are 
>> totally
>> different propagation modes.
>>
>> Ken WA8JXM
>>
>> On Fri, Dec 17, 2021 at 7:22 PM David Herring <david.n5dch at gmail.com> 
>> wrote:
>>
>>> It is absolutely true that antennas intended for NVIS use do not 
>>> have to
>>> be hung low.  But they CAN be.  And there are instances where doing 
>>> so can
>>> be desirable.
>>>
>>> When I lived in Hawaii, we used NVIS for reliable statewide HF
>>> communications to very good effect.  When I hung my dipole up about 
>>> 30 feet
>>> or so, I would frequently get calls from hams in Japan, Oceana, 
>>> mainland
>>> US, Canada and elsewhere. Ordinarily that would be nice, but when 
>>> one is
>>> specifically focused on local comms, that can get to be a problem. 
>>> When I
>>> hung my NVIS dipole down around 10 feet, I still got excellent 
>>> statewide
>>> communications but no longer got calls from afar.
>>>
>>> So I kept my dipole low for local, and erected a vertical for DX. Both
>>> worked perfectly for their intended use.
>>>
>>> In Hawaii, 40 meters worked great for NVIS probably 11 out of 12 
>>> months a
>>> year. Someone else who knows can comment, but I got the impression 
>>> that 40
>>> meters almost never works for NVIS in the mainland US.  If this is 
>>> true, an
>>> Elecraft NVIS field day might be limited to those who either have 
>>> room for
>>> an 80 meter dipole, or who can devise some other kind of 80 meter 
>>> antenna
>>> that can radiate up.
>>>
>>> 73,
>>> Dave - N5DCH
>>>
>>>
>>>
>>>
>>>> On Dec 17, 2021, at 11:05 AM, Julia Tuttle <julia at juliatuttle.net>
>>> wrote:
>>>> Wait, why would people think verticals are good for NVIS? Isn't a
>>>> vertical's radiation pattern pretty much "sideways but not up", and 
>>>> NVIS'
>>>> desired radiation pattern "up but not sideways"?
>>>>
>>>> On Fri, Dec 17, 2021, 12:54 Jim Brown <jim at audiosystemsgroup.com
>>> <mailto:jim at audiosystemsgroup.com>> wrote:
>>>>> On 12/17/2021 6:12 AM, Greg Herman wrote:
>>>>>> What if there was the annual event called the The Elecraft
>>>>>> NVIS field day?
>>>>> There is a major myth regarding NVIS that antennas must be low. 
>>>>> This is
>>>>> totally false. The facts are that vertical antennas are terrible for
>>>>> NVIS, and that horizontal antennas work better up to nearly one-half
>>>>> wavelength above ground. This study ran in National Contest Journal
>>>>> several years ago.
>>>>>
>>>>> http://k9yc.com/AntennaPlanning.pdf
>>>>>
>>>>> 73, Jim K9YC
>>>>>
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