Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 5 Jan 2016 07:40:31 -0400
This B&W Antenna sort of reminds me of the infamous MaxCom antenna feed which gave a VSWR of less that 2:1 from 1.8 to 30 Mhz sold for a while in the 70's and 80's. After scamming thousands of hams w
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 6 Jan 2016 20:17:53 -0400
Gotham back then sure made a lot of money selling a couple pieces of aluminum tubing and a taped coil. Ironically, even will a few radials and less than 20% efficiency users were able to work some DX
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 6 Jan 2016 20:30:40 -0400
Back then not to much interest was given to SWR as long as you could load via a pi-network. This was followed by an era of baluns, un-uns, etc and the benefits of top loading a vertical. Herb, KV4FZ
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Thu, 3 Mar 2016 19:25:25 -0400
Since the tower itself is the other half of the antenna itself what you have is just found another way to feed the tower which does a significant portion of the actual radiation. Put in at least 16 r
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sat, 23 Apr 2016 20:03:03 -0400
RF chokes designed for 5 or 10 MHz could be placed to the spider beam elements and also increase the Top Load. Because this is a high voltage point in respect to 160 hand wound air chokes of sufficie
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 1 Jun 2016 17:07:39 -0400
I remember visiting the radio shack of DX legend Dick Spencely's (KV4AA) in the 70's and saw how he rotated his Mosley 20 meter Yagi with a bicycle elongated chain drive that came into the shack and
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 1 Jun 2016 19:03:11 -0400
Now thats a CLASSIC Herb! Love these old radio stories!! Best regards, Scott W3TX I remember visiting the radio shack of DX legend Dick Spencely's (KV4AA) in the 70's and saw how he rotated his*Telre
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 21 Jun 2016 07:42:12 -0400
I know of an incident in St. Thomas where a fall protection system actually failed. My son a Comtrain certified instructor where preparing for a 225 foot climb and the owner of the tower, the biggest
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Fri, 29 Jul 2016 16:08:51 -0400
Hopefully some thought will be given to the venues near major airports in the U.S. Driving from Cincinnati or Columbus in a rental car for amateurs that can only fly in was problematic at times. Gett
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Fri, 29 Jul 2016 18:23:04 -0400
Hopefully some thought will be given to the venues near major airports in the U.S. Driving from Cincinnati or Columbus in a rental car for amateurs that can only fly in was problematic at times. Gett
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 24 Aug 2016 10:36:28 -0400
I have a D3-W (with the 10 Mhz driven element extension) up at 50 feet with a 6 meter beam on top. It is a very fine performing antenna and beats previous wire antennas hands down. <http://blog.boxbe
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 24 Aug 2016 18:20:47 -0400
I bought mine used for $100 and just added on the 10 Mhz extension kit. I removed the trap selof taping screws and cleaned underneath with new self taping screws....and all went well. Very low VSWR o
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sun, 28 Aug 2016 18:37:26 -0400
This trick can work with split driven element feeds but I don't think it works with a beta match fed on a tribander. <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=26592482228&tc_ra
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 29 Aug 2016 20:06:52 -0400
One of the issues with wide spacing on quads is that they may lose coupling from the driven elements and don't develop the gain one would expect. A quagi idea works but that uses a quad driven elemen
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 30 Aug 2016 13:42:40 -0400
Instead of a quad I built a delta loop version which required only two aluminum spreaders per element and a connecting wire on top for each element. Every V spreader was attached to the boom with con
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 5 Oct 2016 13:30:33 -0400
The Army telephone cable (WD-1A) is probably a lot cheaper and DX-Engineering now sells matching units for it. You can buy a 1/2 mile of the telephone cable from Ebay for under $100. <http://blog.box
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Thu, 27 Oct 2016 06:56:09 -0400
The coated rabbit wire mesh also works but the coating must be sanded of were connections are made. On 10/27/2016 12:16 AM, Roger (K8RI) on TT wrote: Unlike Galvanized mesh, all the stucco mesh I've
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sat, 29 Oct 2016 07:43:22 -0400
Because of the high amount of copper theft in recent years some AM stations in Puerto Rico hjave resorted to using barbed wire in their ground system. Its cheap and lasts a long time but hard to hand
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Thu, 3 Nov 2016 13:41:06 -0400
Easy as I have done this with an insulated driven 15 meter element spaced about a foot away from the 20 meter element. The so called single feed line parasleve concept works well but the 20 meter DE
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Fri, 4 Nov 2016 12:29:02 -0400
I have suspended a T antenna from two 50' foot towers and a 50'drop wire...adjust the T to give a good match on 1.8 against ground. (A few radials will do. Them with two additional drop wires on insu