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References: [ +from:dj7ww@t-online.de: 167 ]

Total 167 documents matching your query.

1. Re: [TowerTalk] tuners and power rating (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Mon, 29 Nov 2010 04:56:49 +0100
A tuner working into a 5:1 mismatch would not improve the antenna and feed line loss anyway. A tuner is the wrong approach to compensate a bad antenna design. 73 Peter I have noticed several so calle
/archives//html/Towertalk/2010-11/msg00477.html (8,232 bytes)

2. Re: [TowerTalk] 80/40 coax trap dipole design (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Wed, 15 Dec 2010 15:21:04 +0100
It will not work on two bands without a trap 73 Peter Barry's designs use a loading coil in each leg rather than a trap, and the coils are roughly at the point where the insulator would be for a half
/archives//html/Towertalk/2010-12/msg00276.html (9,074 bytes)

3. Re: [TowerTalk] 80/40 coax trap dipole design (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Thu, 16 Dec 2010 16:01:42 +0100
Hi Gerald, Sure, a parallel LC circuit (trap) will do it but not a coil alone. Traps should not resonate on a frequency one wants to use anyway. 73 Peter _____ From: TexasRF@aol.com [mailto:TexasRF@a
/archives//html/Towertalk/2010-12/msg00296.html (10,433 bytes)

4. Re: [TowerTalk] 80/40 coax trap dipole design (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Thu, 16 Dec 2010 18:28:11 +0100
Of course, a 40m delta loop, dipole or vertical works nicely on 15m 73 Peter There are good examples of antennas that work well on two bands without a trap. For example, the 2m / 70cm verticals, whic
/archives//html/Towertalk/2010-12/msg00297.html (10,013 bytes)

5. Re: [TowerTalk] 80/40 coax trap dipole design (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Thu, 16 Dec 2010 19:18:37 +0100
In the meantime I learned that it indeed uses traps. And with a decent tuner any wire "works" 73 Peter As others have observed, that is simply false. _______________________________________________ _
/archives//html/Towertalk/2010-12/msg00299.html (9,219 bytes)

6. Re: [TowerTalk] 1/4 wave coax "Balun"? (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Wed, 29 Dec 2010 14:00:43 +0100
It is: http://nrgkits.shopfactory.com/workshop/half_wave_dipole_aerial.htm http://www.g0ksc.co.uk/creatingabalun.html 73 Peter The use of an ODD electrical quarter-wave of coaxial cable as a BAL-UN i
/archives//html/Towertalk/2010-12/msg00396.html (7,718 bytes)

7. Re: [TowerTalk] Non-conductive Boom Materials (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Mon, 10 Jan 2011 18:59:11 +0100
The easiest way might be to tune it off resonance by connecting a capacitor across a part of the boom within reach. 73 Peter Thanks to our late December windstorms, I will soon have the opportunity t
/archives//html/Towertalk/2011-01/msg00184.html (7,807 bytes)

8. Re: [TowerTalk] compression PL259 (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Sat, 22 Jan 2011 19:58:04 +0100
I always solder PL259 plugs with my old Weller TCP 50W iron and never had any problem 73 Peter Because a Weller 100 watt gun usually melts the coax before the connector gets hot enough to work. I hav
/archives//html/Towertalk/2011-01/msg00397.html (10,082 bytes)

9. Re: [TowerTalk] 80m quarter wave on 160m... can support guys be used to provide capacitance loading? (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Thu, 27 Jan 2011 14:37:51 +0100
When you make the guy wires about half a wavelength long it is possible to build a very effective vertikal array. I am in the process to do similar. My 160m vertical will be my shunt fed 44m high tow
/archives//html/Towertalk/2011-01/msg00440.html (10,419 bytes)

10. Re: [TowerTalk] Protecting ferrites? (score: 1)
Author: "DJ7WW" <dj7ww@t-online.de>
Date: Tue, 30 Aug 2011 11:06:08 +0200
My chokes are wound through 4.5" toroids #61 mix. My cable is 1/2" ultraflexible Cellflex. I do not use any wheather shielding either, so far no problem. The oldest choke is now for 4 years exposed t
/archives//html/Towertalk/2011-08/msg00490.html (9,221 bytes)

11. Re: [TowerTalk] 15m monster finally up (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Wed, 26 Sep 2012 21:15:39 +0200
Very effective patterns to NA/SA, JA/NA or JA/ZS at the same time will be made available by switching the 4 high stacks out of phase. 73 Peter, DJ7WW After studying this a little more, I do not think
/archives//html/Towertalk/2012-09/msg00427.html (13,217 bytes)

12. Re: [TowerTalk] Installing a mast..same thread, different name (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Sat, 20 Apr 2013 18:27:07 +0200
With my just 2.5m height of the gin pole above the tower I inserted 6m long masts easily. I just added enough intermediate weight to the lower part of the mast to keep it vertical. 73 Peter The probl
/archives//html/Towertalk/2013-04/msg00276.html (12,762 bytes)

13. Re: [TowerTalk] One more dipole-balun question (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Mon, 3 Jun 2013 19:34:40 +0200
I wound all my wideband transformers on ferrite, like beverage 9:1 transformers, stack match 2:1 transformers etc. I use powered iron cores in tuned circuits only. 73 Peter, DJ7WW 9:1 etc. )? What mi
/archives//html/Towertalk/2013-06/msg00045.html (8,647 bytes)

14. Re: [TowerTalk] m2 40M4LLDD + 20m add on (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 9 Jul 2013 18:23:33 +0200
We built a stack of similar duo banders 50m and 27m high at DR1D. 4 elements on 20 and 4 elements dual driven on 40m. Works extremely well, antennas are Optibeam OB4020 with 49 feet boom length. http
/archives//html/Towertalk/2013-07/msg00140.html (7,334 bytes)

15. Re: [TowerTalk] Which Balun with the TH7DXX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 00:54:40 +0200
A solenoid winding made of coax is more effective then those 4 wraps. I use SCF12-50 Cellfex to wind my choke baluns. 30 turns on a pvc tube of 4-5" diameter do the trick (2000 ohms at 14MHz). 73 Pet
/archives//html/Towertalk/2013-07/msg00422.html (8,092 bytes)

16. Re: [TowerTalk] Which Balun with the TH7DXX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 03:55:04 +0200
One turn is quoted by Fair-Rite with 190 ohms at 10MHz, 290 ohms at 25MHz 31 mix would not be my choice for a balun anyway, at least not with decent power. Its curie temperature ist just over 130C.
/archives//html/Towertalk/2013-07/msg00424.html (9,909 bytes)

17. Re: [TowerTalk] Which Balun with the TH7DXX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 12:55:28 +0200
I used their table with the snap-its cores. The 2.4 inch 61 core is part number 5961003821. I use them for stack match transformers from time time or for small baluns wound with RG142. 13 turns of RG
/archives//html/Towertalk/2013-07/msg00429.html (10,199 bytes)

18. Re: [TowerTalk] Which Balun with the TH7DXX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 13:19:25 +0200
No problem with winding that cable on a 4" pvc pipe. And that cable is cheaper for me then four Fair-Rite toroids. The 40m yagis feed point impedance is 28 ohms. For the transformation and balun I us
/archives//html/Towertalk/2013-07/msg00430.html (11,002 bytes)

19. Re: [TowerTalk] Which Balun with the TH7DXX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 16:05:13 +0200
Yes, I am pretty confident that it works on 20m. 30H give me 2638 ohms. On the feed line I measure no common mode current either. I am using such on a 20m KLM yagi now which I converted to OWA two w
/archives//html/Towertalk/2013-07/msg00436.html (10,065 bytes)

20. Re: [TowerTalk] Which Balun with the TH7DXX (score: 1)
Author: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 18:23:45 +0200
Jim, did you ever try that as a balun on the feed point of a yagi with the power level RG393 is good for? 73 Peter Jim VE7RF _______________________________________________ __________________________
/archives//html/Towertalk/2013-07/msg00439.html (8,963 bytes)


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