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References: [ 73 ]

Total 73 documents matching your query.

1. [TowerTalk] 2-el yagi gain vs boom length (score: 1)
Author: (realex)
Date: Sun Apr 6 09:41:45 2003
Hi Pete, 18 feet is closer to .14 wavelength. Dr. Lawson says with that boom length gain is around 7 dBi with around 11 dB f/b 73, Bob, W5AH --Original Message-- Can someone who has W2PV's book tell
/archives//html/Towertalk/2003-04/msg00089.html (7,012 bytes)

2. [TowerTalk] Balun for old Telrex Beam (score: 1)
Author: (realex)
Date: Sun Apr 20 06:51:30 2003
Any 1:1 balun will work. The "custom" balun from Telrex was a 3 wire 1:1. 73, Bob, W5AH A friend has and old but unused TELREX TB6EM tribander that uses a custom balun which is lost. The rest of the
/archives//html/Towertalk/2003-04/msg00375.html (7,770 bytes)

3. [TowerTalk] VSWR & Power (score: 1)
Author: (realex)
Date: Sat Mar 1 22:12:17 2003
If one directly measures the voltage, current and associated phase angle (in radians) for the 3:1 mismatched line shown below (hard to do on a coax but easy on twin line) then, E x I x Cos Theta(rads
/archives//html/Towertalk/2003-03/msg00012.html (7,694 bytes)

4. [TowerTalk] Effect of feedline on apparent resonance (score: 1)
Author: (realex)
Date: Mon Mar 10 07:28:10 2003
Hi Pete, Ive had experience with cables listed as something or the other "type" cable and have found that quite often physical appearance is the only thing the "type" cable has in common with the ori
/archives//html/Towertalk/2003-03/msg00133.html (9,875 bytes)

5. [TowerTalk] Homebrew Tuner Thoughts Needed (score: 1)
Author: (realex)
Date: Thu Mar 20 06:19:42 2003
If the MFJ works, why bother with the other one? Bob, W5AH Years ago, I made a Lew McCoy tuner (Ultimate Transmatch) using new EF Johnson Air Variables and a nifty new 28 mh roller inductor. I think
/archives//html/Towertalk/2003-03/msg00249.html (9,288 bytes)

6. [Towertalk] 402BA dimensions (score: 1)
Author: (realex)
Date: Tue, 14 Jan 2003 18:32:43 -0600
Terry, The 402BA manual says the linear loading assemblies for each DE half are approximately 91 1/2" of 1/8" rod. The DE is tapered in 5 segments. DE1 is 1 1/4" X 100 1/16" measured from the center
/archives//html/Towertalk/2003-01/msg00275.html (7,206 bytes)

7. [TowerTalk] Rising VSWR (score: 1)
Author: (realex)
Date: Tue Jan 28 05:47:35 2003
Measure the VSWR with a different meter and see if the problem goes away Bob, W5AH Greetings, I'm trying to chase down a problem in my antenna system. On 80 and 160 meters, I see a rise in VSWR after
/archives//html/Towertalk/2003-01/msg00471.html (9,113 bytes)

8. [TowerTalk] Full wave loop on 80m : Impedance 50 or 75 Ohms?? (score: 1)
Author: (realex)
Date: Tue Jan 28 20:19:50 2003
A vertically mounted full wave loop that is rectangular ( twice as high as it is wide) will have a feedpoint Z of around 40 ohms when fed in the center of the short side nearest the ground. Since you
/archives//html/Towertalk/2003-01/msg00503.html (8,644 bytes)

9. [Towertalk] Anyone homebrew staggered monobanders on same boom??? (score: 1)
Author: (Bob Alexander)
Date: Thu, 9 May 2002 05:45:57 -0500
I believe Dick Fenwick, K5RR, had an article on the subject in QST a few years ago. Bob, W5AH --Original Message-- From: []On Behal
/archives//html/Towertalk/2002-05/msg00228.html (8,136 bytes)

10. [Towertalk] 40 meter antenna results (score: 1)
Author: (Bob Alexander)
Date: Sun, 7 Apr 2002 21:41:23 -0700
Lets make it two votes for the 402BA. Ive had one up for 13 years and have had no problems with the antenna. I dont know how old it was when I bought it. Bob, W5AH --Original Message-- ///SNIP/// The
/archives//html/Towertalk/2002-04/msg00242.html (7,515 bytes)

11. [TowerTalk] Using guy wire to carry in coax lines? (score: 1)
Author: (Bob Alexander)
Date: Wed, 9 Jan 2002 17:32:52 -0600
Hi Bill, I have used a similar arrangement to what you describe for 15 years of so. The difference is that I added a 4th "guy" just below my lower guy wires. This extra guy is 1/8 " aircraft cable an
/archives//html/Towertalk/2002-01/msg00217.html (8,832 bytes)

12. [TowerTalk] Front to Back Measurements (score: 1)
Author: (Bob Alexander)
Date: Thu, 13 Dec 2001 06:00:46 -0600
Hi Kim, It is not possible to get an accurate F/B measurement (or any kind of pattern measurement)from any rig that has the AGC turned on. Also, the signal must be a constant carrier, not SSB. I am n
/archives//html/Towertalk/2001-12/msg00310.html (9,017 bytes)

13. [TowerTalk] Half slopers using a tower (score: 1)
Author: (Bob Alexander)
Date: Mon, 31 Dec 2001 21:08:31 -0600
Stephanie, Try moving the sloper feedpoint up to the top of the tower and add a choke balun to the feedline if there is not one there already. Also, as someone else said, try adjusting the height abo
/archives//html/Towertalk/2001-12/msg00651.html (7,769 bytes)

14. [TowerTalk] Stuck Elements (score: 1)
Author: (Bob Alexander)
Date: Sat, 3 Nov 2001 07:31:32 -0600
I recently disassembled an old Hygain DB1015 that had elements thouroughly stuck together by pouring some hydrogen peroxide over the joints in question. It will loosen or break up the oxidation holdi
/archives//html/Towertalk/2001-11/msg00051.html (8,126 bytes)

15. [TowerTalk] phased verticals (score: 1)
Author: (Bob Alexander)
Date: Mon, 5 Nov 2001 06:22:57 -0600
Hi Dick, The feedlines to each vertical need to be equal lengths. They do not have to be 3/4 wavelength, however. You can save on coax by using two lines that are equal length and long enough to conn
/archives//html/Towertalk/2001-11/msg00093.html (7,635 bytes)

16. [TowerTalk] Ferrite core identification (score: 1)
Author: (Bob Alexander)
Date: Mon, 12 Nov 2001 16:38:39 -0600
Can anyone help me identify some ferrite cores I have. Around 10 years ago I obtained a double handfull of toroids for use in baluns. I do not remember who the manufacturer was. The cores are approxi
/archives//html/Towertalk/2001-11/msg00278.html (7,214 bytes)

17. [TowerTalk] Heathkit SA 2060 (score: 1)
Author: (Bob Alexander)
Date: Sun, 18 Nov 2001 09:35:58 -0600
Can anyone help me with the going price for a Heathkit SA2060 Antenna Tuner? Bob, W5AH List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and m
/archives//html/Towertalk/2001-11/msg00409.html (6,755 bytes)

18. [TowerTalk] TH6DXX Element adjustment question (score: 1)
Author: (Bob Alexander)
Date: Sat, 24 Nov 2001 07:55:32 -0600
Hi Tom, Go with the lengths in the manual. I'm not very familiar with the TH6 (I have a TH7), however, experience with yagis in general says that sometimes elements can be shorter or longer than one
/archives//html/Towertalk/2001-11/msg00486.html (8,256 bytes)

19. [TowerTalk] loss resistance (score: 1)
Author: (Bob Alexander)
Date: Sun, 14 Oct 2001 08:36:58 -0500
Hi Pete, Losses and feedpoint Z add so they are effectively in series. Thats why we quite often see a 1:1 SWR at the base of a vertical over poor ground that has no radials at all or not enough radia
/archives//html/Towertalk/2001-10/msg00284.html (8,479 bytes)

20. [TowerTalk] Big gun? (soldering, that is) (score: 1)
Author: (Bob Alexander)
Date: Sat, 1 Sep 2001 06:38:15 -0500
Buy both of them. Ive had both the 100/140 and 200/260 since the 60's and would not be without them. I just checked and my big gun is actually 240/325 Watts. No such thing as a cold solder joint with
/archives//html/Towertalk/2001-09/msg00003.html (7,547 bytes)

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