Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login

Posted: 10/2/2014 10:54:47 AM EST
... without looking like some space alien?

Link Posted: 10/2/2014 11:08:55 AM EST
Sure, why not? Just a ~65' wire (EFHW) strung up into a tree. Find a branch 30' high, move away from it a little distance and slingshot it over the branch. Move back until the other end is off the ground. Or, find a branch 10' off the ground and back up farther
Link Posted: 10/2/2014 11:21:15 AM EST
[Last Edit: 10/2/2014 11:26:52 AM EST by SimpleScout]
This is the lowest profile setup I've seen. They're expensive, but maybe you could make something similar yourself?


The owners manual goes into a little detail about it's design and construction:

Link Posted: 10/2/2014 3:14:33 PM EST
It's possible, but very, very rarely. The MUF is almost never above the bottom of 40M. Although, strangely enough as it is very coincidental with your post, with the recent flare MUF is way, way up there. But this is so very unusual. 99% of all amateur NVIS occurs on 60 and 80M.

Link Posted: 10/2/2014 3:36:20 PM EST
[Last Edit: 10/2/2014 3:38:45 PM EST by danpass]
Yeah, I see a critical frequency, foF2, at the time of this post of 11.788mhz.

http://car.uml.edu/common/ShowIonogramPage?mid=18237075&ursiCode=EG931&time=2014.10.02%20(275)%2020:15:00.000


40m lasts well into the night down here in south Florida.
Link Posted: 10/2/2014 3:47:05 PM EST
Simplest way is the old long whip. As long as possible stretched and bowed over the vehicle, end to end or corner to corner. Add a loading coil, screwdriver or auto tuner as needed to electrically lengthen it for 40m.
Link Posted: 10/2/2014 4:04:16 PM EST
Here is what the Marines suggest (page 4-40 to 4-43).
Link Posted: 10/2/2014 6:25:50 PM EST
[Last Edit: 10/2/2014 6:35:19 PM EST by Harlikwin]
Whip tied so it crosses the vehicle with some of the radiator horizontal.

Eta as per the marine tm above. You could also use a wire elevated above your roof a few inches or feet. Ala the old nazi radio trucks. Use a tuner to match it.
Link Posted: 10/2/2014 7:06:27 PM EST
[Last Edit: 10/2/2014 7:07:00 PM EST by RedHotChiliPepper]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SimpleScout:
This is the lowest profile setup I've seen. They're expensive, but maybe you could make something similar yourself?

View Quote

The owners manual goes into a little detail about it's design and construction:


Of course it's expensive. A CRV would be much cheaper.
Link Posted: 10/4/2014 3:37:07 AM EST
Operating mobile NVIS is feasible and relatively expansive if you want to be "in motion" while operating. A mobile magnetic loop is about the only thing that can be used for that.
Stationary you can use a variety of end fed antenna that you'll install at about 10' above ground.
Link Posted: 10/4/2014 4:02:15 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SGObserver:
Operating mobile NVIS is feasible and relatively expansive if you want to be "in motion" while operating. A mobile magnetic loop is about the only thing that can be used for that.
Stationary you can use a variety of end fed antenna that you'll install at about 10' above ground.
View Quote


You can use a whip as well as mentioned by me and others. The vehicle makes a nice reflector for NVIS.
Top Top