So my Virginia towers are almost completed and most of the antennas are ready to install. I am thinking of adding a rotatable 80 meter yagi on one tower. Any suggestions? John J. Nistico 911 Electric
Hi John,I'm assuming you want a loaded shortened dipole. I would suggest contacting JK Antennas and ask Ken to fab two of his loading coilsfor a shortened 80M rotary dipole. His loading coils are ou
I can recommend the 80m JK801 rotatable dipole. I have one at 138' and so far so good. It's only been up since July so I'm looking forward to the fall/winter DX season. The antenna does not use coi
Rich, I looked at the stack on QRZ.com. Great station Rich !I can't make out the JK801 in the picture. The specs on JK site show the T-hats, very nice ! Anda loading coil (motorized ?) BobK6U
Hi Bob, Yes the tornado tuner is a dual motorized coil. It works just like a mobile coil antenna. Rich - N5ZC On 10/8/2017 8:25 PM, Bob K6UJ wrote: Rich, I looked at the stack on QRZ.com. Great st
Nice antenna Rich! At one time I had a homebrew 90++ foot dipole that covered the portion of the phone band that I used but on CW the SWR was pretty high. Are there presets for the tornado coils or d
My Tornado does not have any sliding contacts such as in a mobile loading coil. Instead it compresses and expands a solid connections at the ends wound copper tubing coils. This gives a 2:1 inductanc
FYI......... Anyone in need of a Tornado Tuner I have one that's never seen daylight. Changed directions from an M2 rotary dipole to a vert 4sqr array. I don't have controller. Will make a good deal
Some options: http://www.m2inc.com/amateur/80m3l-3-50-3-565-3-75-3-82-mhz/ http://www.optibeam.info/index.php?article_id=111&clang=1 http://www.smeter.net/7j4aal/antennas.php --So my Virginia towers
I have a F12 Magnum 180 ... its 76' long with 26' T-bars that are about 13' from each end. There are massive 3/8" aluminum tubing coils at the center, one on either side to add inductance and then I
Hi John, The preset's are built into the MFJ-1924 mobile antenna controller. So if I know I'm going to qsy more than 20 khz in either direction I'll have to push one of the memory buttons on the 1924
Hi John, As the first part of your thinking about this, I strongly suggest that you study my applications note on this topic. The most important conclusion is that height of a horizontally polarized
tTo all on this thread I need to apologize for not be specific about the tornado Tuner I have fo sale: Seco Systems ( Seco-systems.net) Model 80D dual coil remote operation...for use with rotatable d
Jim I could lower the antenna on the tower if they make a ring rotor that will handle it. I have 2 fixed 3 element vertical wire beams one I use already that works great. But I want something rotatab
Author: Andre VanWyk via TowerTalk <towertalk@contesting.com>
Date: Mon, 9 Oct 2017 20:42:00 -0500
You might consider an 80m 4 square if you have room. I put one up last year and it is a wonderful antenna with good directivity. 73 NJ0F Sent from my iPad ____________________________________________
Date: Mon, 9 Oct 2017 10:17:37 -0700 From: Jim Brown <jim@audiosystemsgroup.com> To: towertalk@contesting.com Subject: Re: [TowerTalk] 80 Meter yagi question Message-ID: <2f079a2a-ae46-4d37-3abd-c426
My 80m antenna evolution near Seattle, evolved over 4 years after moving there. 1. Two 80/40/20 fan dipoles at 90 degrees @65' - Very good F/S on 20 & 40. Not much on 80m. V. Hard to get EU DX from S
That is one of the important conclusions of the applications note I posted earlier in this thread. That work is based on NEC modeling for "flatland" and my on-air experience confirms it. For low angl
.417 inch OD aluminum. Jim VE7RF That is only true at frequencies below which skin effect is significant. For RF frequencies, you need to take the square root of 60% which comes out to 77%. 1/4 inch
<That is only true at frequencies below which skin effect is <significant. For RF frequencies, you need to take the <square root of 60% which comes out to 77%. <1/4 inch copper = 5/16 inch aluminum.