Re: Topband: NVIS Antenna

2020-03-15 Thread m.r.c.
Receive only comment. A low dipole - 15 feet average, uneven ground - Receive Only - accounted for something like 40% of the contacts with NA from XZ0A. During the first 2 hours at Sunset, the low dipole heard signals that the admittedly not all that good beverages could not hear at all.

Topband: Stew Perry Preliminary Results posted

2020-03-15 Thread Tree
Great to see so much activity for the Spring Stew. Was sorry to miss it myself. The preliminary results are now online: https://www.kkn.net/stew/stew_results.html 73 Tree N6TR _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Re: Topband: NVIS Antenna

2020-03-15 Thread Wes
When I decided on the new challenge of working DXCC on 160 for my ninth band, I added some extensions on my 80-meter inverted-vee , (apex at 45') and tied them off on some handy saguaro cacti about head high.  You don't climb these :-)  I worked my first 80 or so countries with it.  And this is

Re: Topband: NVIS Antenna

2020-03-15 Thread Carl Luetzelschwab
For those who are antenna challenged, don't sell a 160m inverted-vee at low height too short. My 160m antenna at the moment is an inverted-vee at an apex of 45 feet. Additionally, the last third of each end is at 90 degrees to the main portion and horizontal at only 7 feet or so off the ground.

Re: Topband: NVIS Antenna

2020-03-15 Thread John Kaufmann via Topband
Inverted vee dipoles do produce some vertically polarized radiation off the ends. However, that vertical component has maximum gain at zenith, i.e. straight overhead. It does not contribute to any significant low-angle radiation. You can see this by doing an antenna model. 73, John W1FV

Re: Topband: NVIS Antenna

2020-03-15 Thread Jim Brown
Hi Ed, I've studied this extensively for horizontally polarized antennas, but only for flat ones; I thin that inverted Vees have some vertical components. For horizontally polarized antennas, maximum gain at high angles occurs at a mounting height of about 75 electrical degrees, and falls

Topband: NVIS Antenna

2020-03-15 Thread sawyered
I was reminded of my interest in re-installing a low 160M antenna to supplement by 2 el vertical phased array. And since there was no where to go this weekend and no College Hoops to watch, I thought, hey, I could get something up and play around with it in the Spring Stew. And that what I did.

Re: Topband: Slightly OT - amplifier noise

2020-03-15 Thread Ken Claerbout
A couple of issues I see. It depends which direction(s) the noise and desired signal are coming from. You may null the noise and signal. Also, the loop is bi-directional. I've been playing with a DX Engineering RF-PRO-1B at ET3AA and it works. Thanks to Tim and the gang for their support. But