Re: Topband: Inverted L off tower?
Jim I put up a 70 foot tower (Tashjian DX-70) with a SteppIR DB-36 Yagi about 5 feet above it last year. I hung an IAC "Double Bazooka" Inverted L on it with 3 to 4 foot yardarm at the top of the tower. The tower is on the highest peak of my property and none of the pine trees are high enough to run the "horizontal" part of the L horizontally, so it slopes around 45 degrees. I also run my Yagi coax and control lines down an 18 inch yardarm that is 120 degrees away from the Inv. L in the horizontal plane. Some of the radials are 135 feet long, but most of them are 70 feet. The IAC "Double Bazooka" design is quite broadband (less than 2:1 from 1.8 to 2.0 MHz) - similar to a cage design. It's SWR is lowest when I set the SteppIR DB-36 to the low end of 80 meters. The antenna gets out pretty well. I get good reports from Europe from here in Arizona (even from guys I can't hear). I was able to work 74 countries in my first year on 160 with this antenna - including some of the major DXpeditions we had this year. I hope to have a Hi-Z 4-square RX antenna up in time for next season, so I'll be able to hear more people that can hear me, but I currently have no plans to change the TX antenna. 73 de Bob N6RW On 5/23/2016 7:34 AM, Jim Miller wrote: Thanks for all the feedback and suggestions. My friend (not me...) is considering his options. 73 jim ab3cv On Mon, May 16, 2016 at 7:40 PM, Jim Miller wrote: One of my friends is thinking about installing a 70 ft. tower with a 2-element shortened 40M yagi. He is thinking about installing the new tower in a location where he now has a vertical used for 80M and 160M (i.e - the existing radials will terminate at or close to the base of the new tower). He is planning to relocate the 80M vertical to another location with other radials. He would like to support an inverted L for 160M off of the new tower, using the existing radials. His question is, how far must the vertical leg of the inverted L be spaced from the new tower, with a view to keeping it close enough to use the existing radials? Thanks jim ab3cv _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: ma160v
Hi all.I currently have 1 cushcraft ma160v,as you all know this is a cushcraft 160 vertical.I just recently aqquired a second.Now,has anyonetried a rotatable dipole using 2 of these.The idea intrigues me.I could mount this on a 55 ft tower.The only other antennas are a m2 6 mtr 2 klm's 2 mtr and a 432 m2.So there should not be any interaction.What does the group think? any ideas? a waste of time? your thoughts..73 john w5jmw _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Topband Dinner-Dayton
For those of us who couldn't make it this year, any photos or video from the Dayton Topband Dinner? 73. . . Dave, W0FLS - Original Message - From: "Hugh Valentine" To: ; Sent: Monday, May 23, 2016 8:12 PM Subject: Re: Topband: Topband Dinner-Dayton You beat me to it Barry. It was a great time for all. I'm sad I did not get to spend time with you as I haven't been to the dinner in about 15 or more years. Tree and Tim put on a good show and thanks to George "UVZ". It went by too fast. Val N4RJ Still an "Uncured Ham" -Original Message- From: W9UCW--- via Topband Sent: Monday, May 23, 2016 5:39 PM To: topband@contesting.com Subject: Topband: Topband Dinner-Dayton It was great to see so many old 160 friends... old being the operative word. Tim Duffy and Tree did a good job and all the rest who worked on the event should be lauded for their effort. Nicely done, gang. 73, Barry, W9UCW _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband - No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7598 / Virus Database: 4568/12285 - Release Date: 05/23/16 _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Topband Dinner-Dayton
You beat me to it Barry. It was a great time for all. I'm sad I did not get to spend time with you as I haven't been to the dinner in about 15 or more years. Tree and Tim put on a good show and thanks to George "UVZ". It went by too fast. Val N4RJ Still an "Uncured Ham" -Original Message- From: W9UCW--- via Topband Sent: Monday, May 23, 2016 5:39 PM To: topband@contesting.com Subject: Topband: Topband Dinner-Dayton It was great to see so many old 160 friends... old being the operative word. Tim Duffy and Tree did a good job and all the rest who worked on the event should be lauded for their effort. Nicely done, gang. 73, Barry, W9UCW _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: Topband Dinner-Dayton
It was great to see so many old 160 friends... old being the operative word. Tim Duffy and Tree did a good job and all the rest who worked on the event should be lauded for their effort. Nicely done, gang. 73, Barry, W9UCW _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Inverted L off tower?
Thanks for all the feedback and suggestions. My friend (not me...) is considering his options. 73 jim ab3cv On Mon, May 16, 2016 at 7:40 PM, Jim Miller wrote: > One of my friends is thinking about installing a 70 ft. tower with a > 2-element shortened 40M yagi. He is thinking about installing the new tower > in a location where he now has a vertical used for 80M and 160M (i.e - the > existing radials will terminate at or close to the base of the new tower). > He is planning to relocate the 80M vertical to another location with other > radials. He would like to support an inverted L for 160M off of the new > tower, using the existing radials. His question is, how far must the > vertical leg of the inverted L be spaced from the new tower, with a view to > keeping it close enough to use the existing radials? > > > Thanks > > jim ab3cv > > > _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Inverted L off tower?
This may not be required if you do a three or 4 wire cage feed as the cage does most of the radiation and essential shields the coax and rotor cable wires just as running them inside. On 5/23/2016 8:26 AM, Jon Zaimes wrote: and run all cabling from the bottom and inside the tower whether guyed or self-supporting. _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Inverted L off tower?
Jim, Why not just shunt feed the tower? 70 feet with that beam for top-loading is a good height for 160. If it will be a guyed tower these would need to be insulated, and run all cabling from the bottom and inside the tower whether guyed or self-supporting. Based on some discussion on the reflector a few months ago, the tower would best be sited at the center point of the existing radial field. Offsetting it along one of the radials would be like using only one radial. 73/Jon AA1K www.aa1k.us -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jim Miller Sent: Monday, May 16, 2016 7:41 PM To: topband@contesting.com Subject: Topband: Inverted L off tower? One of my friends is thinking about installing a 70 ft. tower with a 2-element shortened 40M yagi. He is thinking about installing the new tower in a location where he now has a vertical used for 80M and 160M (i.e - the existing radials will terminate at or close to the base of the new tower). He is planning to relocate the 80M vertical to another location with other radials. He would like to support an inverted L for 160M off of the new tower, using the existing radials. His question is, how far must the vertical leg of the inverted L be spaced from the new tower, with a view to keeping it close enough to use the existing radials? Thanks jim ab3cv _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
