Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 7 Nov 2016 14:12:17 -0400
You can remove the inductive reactance by inserting an equal value of a capacitor in series. The impedance is close enough. I need a capacitor to tune out z = 41.2 + j139. For the educational experie
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Thu, 17 Nov 2016 14:01:00 -0400
Is Yaesu tech support in the US? I doubt if I call Japan I could get an answer on this. Herb, KV4FZ At 05:36 AM 11/17/2016, Herbert Schoenbohm wrote: I have an orphan Yaesu G-8000DXA controller and w
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 21 Nov 2016 06:56:12 -0400
Thanks Henk that's good information. i guess i have two G-800DXA controllers to sell on eBay. G800/1000 models are DC 24 V. Not interchangeble. Dont know if the G450A is the same as G450XL. I cannot
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 21 Nov 2016 13:36:39 -0400
It seems to be from the G-450 schematic that the rotor motor has two winding one for one direction and other direction and the other for the opposite direction and uses three wires to accomplish this
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 21 Nov 2016 15:29:24 -0400
Thanks Joe for this valuable information. I know now Ii have two G-800DXA control boxes to try and sell on e Bay. Normally hams want just the rotor unit, however. Herb, KV4FZ That is known as a capac
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 30 Nov 2016 15:16:02 -0400
did you correct the length of the stub b the RG59 velocity factor? Plus the stub length is different for foam coax. Since RG-59 is cheap i would experiment my making the stub too long and then trimmi
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 26 Dec 2016 15:47:42 -0400
With such a high amount of copper theft some AM radio stations in Puerto Rico choose to replace their radial field with inexpensive buried barbed wire. They would plow it into the ground with a Ditch
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sun, 22 Jan 2017 14:29:58 -0400
Nothing like check your radiation pattern(s) with a good field strength meter or local ham on ground wave while talking to him on the phone for starters before you get carried away with propagation p
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 25 Jan 2017 11:25:50 -0400
I came into the possession of two unusual high power baluns, one with 125' of RG-213 attached and the other with a two foot lead of coax attached. They are seal and inside PVC with the coax going ins
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Wed, 25 Jan 2017 14:22:38 -0400
Thanks Doug.....It appears to be military surplus for a T2FD which are common at military and diplomatic installations as well as sent to National Guard com units that have no real use for them. Herb
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Fri, 27 Jan 2017 12:33:31 -0400
This large sundial (Point Udall) is just down the road from my house and is the Easternmost point of the U.S. in North America. http://www.atlasobscura.com/places/point-udall I have one problem thoug
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Tue, 31 Jan 2017 20:50:48 -0400
Fed with open wire or ladder-line your 20 meter performance will be 2 half waves in phase and when properly matched is supposed to give you 3 db improvement broadside to the wire. Herb, KV4FZ On 1/31
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Thu, 2 Feb 2017 17:07:13 -0400
What did famed moon-bounce king Sam Harris used to say....? "If your antenna stays up its not big enough" I am looking to side mount and maybe rotate a 6 or 8 element 20 meter beam would anyone care
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sun, 5 Feb 2017 12:19:35 -0400
If you want to prove that your MP33 is almost as good as your 4 element 10 meter beam you should just side mount it on your tower at 16 feet below your tribander and compare the difference. I would v
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sun, 5 Feb 2017 18:09:01 -0400
I have been trying to buy just one single triode 3CX800A7 to fix a problem with a sick Alpha 87A. Several match pair are available but used and will only be sold in pairs. The new Eimac version of th
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Mon, 6 Feb 2017 01:44:19 -0400
Thanks Craig for that info....I found a pair of 3CX800A7's for a good price that should put me in business when they arrive. Herb, KV4FZ That's where I bought the last 3CXP800 drivers for a CCA broad
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sat, 11 Feb 2017 16:34:31 -0400
Thanks to all that responded to my inquiry about using the GU-74B's (a tetrode) in triode socket configuration as a replacement for the increasingly expensive and affordable 3CX800A7's. All agree it
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sat, 11 Feb 2017 22:01:11 -0400
Peter.....Yes I know but I was referencing a 3CX800A7 which is an Eimac tube and today is outrageously overpriced. The Machlette 3CX800A7 (Now made in China) is at least still affordable if you can g
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Sun, 12 Feb 2017 14:40:40 -0400
The best solution I have found is to use Matchlette 3CX800A7's from China for $400 each. Matchlette used to be made in the USA but was bought out by a Chinese. K5SVC sells them after buying them in l
Author: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
Date: Fri, 17 Feb 2017 08:45:49 -0400
QST also exposed the so call Max-Com balun that claimed when hooked to a dipole (length not specified) it would give less than 2:1 from 1.8 to 30 Mhz. And they were correct since that's what it did.