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41. [TowerTalk] FW: Hygain 402ba (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Wed, 18 Jun 2014 22:11:26 -0500

Hi Andy, I would offer to consider the pro's & con's of converting it into a Moxon - much more useable bandwidth. Matt KM5VI Hi to all, looking for a little guidance with a 402ba 2el 40 mtr yagi. As

/archives//html/Towertalk/2014-06/msg00176.html (7,996 bytes)

42. [TowerTalk] FW: Aluminum for protective ground? (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Wed, 18 Jun 2014 22:25:28 -0500

Hi Tony, It is not a good idea to use AL to expand your ground system. The galvanic corrosion at the CU-AL joint would be negligible compared to the rate of corrosion loss of the AL metal in direct c

/archives//html/Towertalk/2014-06/msg00177.html (8,894 bytes)

43. [TowerTalk] FW: Sluggish crank-up tower (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Fri, 20 Jun 2014 17:16:42 -0500

Rick is correct - I have several crank-ups and the pulley bearings get dry over time. My approach is to pull them out, remove the bearings, clean the bearings up in the parts washer, drill a small ho

/archives//html/Towertalk/2014-06/msg00215.html (9,368 bytes)

44. [TowerTalk] FW: Polyphaser failure mode (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Thu, 26 Jun 2014 22:34:19 -0500

life as normal? With respect to the question about "go back to life as normal": GDT manufacturers product data typically rates the number of shots for a given tube based on the maximum surge current

/archives//html/Towertalk/2014-06/msg00307.html (8,604 bytes)

45. [TowerTalk] FW: Over heated cores (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Wed, 2 Jul 2014 01:10:52 -0500

"The exceeding of some maximum value of operating parameter by accident, which can create a catastrophic failure A failure caused by increase in temperature is usually time dependent..." "(the vario

/archives//html/Towertalk/2014-07/msg00011.html (9,745 bytes)

46. [TowerTalk] FW: Creating a Yagi Build Table with "Tape Measure" Dimensions (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Fri, 25 Jul 2014 04:52:18 -0500

FYI... You can also just right click on the cell(s) and choose >Format Matt KM5VI --Original Message-- From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Dan Maguire via TowerTalk

/archives//html/Towertalk/2014-07/msg00209.html (11,186 bytes)

47. [TowerTalk] FW: MOV's for Polyphaser Rotor Wire Protection (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Tue, 29 Jul 2014 01:20:24 -0500

Hi Bill, Perhaps someone out there knows the specific answer to your question, but since I did not see a response (yet) perhaps the little info I know may help you in some way. Perhaps someone knowle

/archives//html/Towertalk/2014-07/msg00251.html (9,239 bytes)

48. [Amps] Circuit Board Question (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Fri, 1 Aug 2014 01:19:35 -0500

Could someone help me out with some advice. How much separation between circuit board traces in an antenna switch box would be recommended to reliably handle the voltage associated with legal limit a

/archives//html/Towertalk/2014-08/msg00000.html (6,259 bytes)

49. Re: [TowerTalk] Circuit Board Question (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Sun, 3 Aug 2014 06:25:56 -0500

All comment appreciated & thanks! I tried to put together everyone's good ideas and just finished etching a prototype board about an hour ago - sure takes longer for the 3oz material. The boards are

/archives//html/Towertalk/2014-08/msg00074.html (11,695 bytes)

50. [TowerTalk] FW: 204BA boom resonance, problem for 40 or not ? (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Wed, 13 Aug 2014 23:09:32 -0500

Just want to echo John's comment about the 20m - 40m interactions. I have a pair of stacked 204's going up with a 40m Moxon. I had to move the upper 204 about 15' away from the 40m to get the 20m int

/archives//html/Towertalk/2014-08/msg00270.html (11,164 bytes)

51. [TowerTalk] FW: 204BA boom resonance, problem for 40 or not ? (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Thu, 14 Aug 2014 15:45:13 -0500

... and P40A put out a bodacious signal on both 40m & 20m! :) Matt A Moxon antenna may react differently than a loaded element 40m beam. I have never modeled a Moxon. I had very little interaction be

/archives//html/Towertalk/2014-08/msg00281.html (10,470 bytes)

52. [TowerTalk] FW: Tower Foundation Pad Removal (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Sun, 17 Aug 2014 17:06:55 -0500

foundation? This can be done with a relatively small piece of equipment if you can get close enough to the foundation. I have seen underground concrete thrust blocks used on large piping systems suc

/archives//html/Towertalk/2014-08/msg00319.html (8,301 bytes)

53. [TowerTalk] FW: Damaged G-1000 - Worth Repairing? (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Wed, 20 Aug 2014 02:31:23 -0500

Tony, For what it's worth I bought a replacement part for a G-800 about 15 years ago. The only parts source I could find at that time was Vertex Standard. Although I expected that the price would be

/archives//html/Towertalk/2014-08/msg00338.html (8,545 bytes)

54. [TowerTalk] FW: Concentric Tubing and Piping (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Mon, 25 Aug 2014 23:01:59 -0500

Hi Lee, If your measurements are exact, then you would have what is called a "zero clearance" fit. Not impossible, but zero clearance is at best challenging to assemble. Aluminum telescoping tubing (

/archives//html/Towertalk/2014-08/msg00426.html (10,680 bytes)

55. [TowerTalk] FW: Mosley (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Thu, 18 Sep 2014 18:02:36 -0500

Hi Kelly, Assume you are referring to the 3 element versions... The Junior has a 12' boom and the element traps are only about an inch in diameter. The Senior has a 14' boom and the traps are about 2

/archives//html/Towertalk/2014-09/msg00274.html (7,299 bytes)

56. [TowerTalk] FW: Receive 4-Square (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Thu, 2 Oct 2014 02:32:21 -0500

Correction... Regarding item (3): I checked back on my notes and I did not remember it correctly. Both the 0 deg and 90 deg port of the hybrid should be operating at or near the input impedance. (It

/archives//html/Towertalk/2014-10/msg00002.html (11,845 bytes)

57. [TowerTalk] FW: Receive 4-Square (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Wed, 1 Oct 2014 20:29:24 -0500

Hi Roger, On cursory review, here are some thoughts that come to mind... middle, front and rear elements with a three way hybrid combiner (1) How are you achieving the plus and minus 90 deg phase shi

/archives//html/Towertalk/2014-10/msg00004.html (10,535 bytes)

58. [TowerTalk] FW: Spacing of Antennas (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Thu, 2 Oct 2014 15:47:17 -0500

with a 40m moxon stacked below it at about the same spacing that you are looking at. When modeling the antenna combo, there was enough interaction to predict a fairly significant drop in input imped

/archives//html/Towertalk/2014-10/msg00005.html (8,645 bytes)

59. [TowerTalk] FW: Is A Tower Weaker in Some Directions? (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Sun, 5 Oct 2014 20:55:12 -0500

Although mechanical engineers receive training in stress analysis, you really would want a structural engineer to weigh in. Failure theory considers different modes of failure, which, ultimately tran

/archives//html/Towertalk/2014-10/msg00037.html (13,114 bytes)

60. [TowerTalk] FW: Antenna element diameter \ length calculation (score: 1)

Author: "Matt" <maflukey@gmail.com>

Date: Mon, 6 Oct 2014 22:03:37 -0500

Gary, Try shortening by 3% for 4" aluminum vs 12 AWG copper. Matt KM5VI I am helping a friend with an 80 meter 4 square vertical. Can someone tell me how to calculate the difference in length when 4"

/archives//html/Towertalk/2014-10/msg00047.html (7,904 bytes)