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1. Re: [TowerTalk] 43ft Vertical Feeding Question and Balun type (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Fri, 21 Nov 2008 11:03:03 -0500; Hi Gang, There is magic about a 43 foot vertical but it isn't what most people think. It's 5/8 wavelength at 20 meters, clearly a good maximum performance antenna for DX on that band with a vertical.; /archives//html/Towertalk/2008-11/msg00536.html (15,913 bytes)
2. Re: [TowerTalk] Cushcraft XM240 replacement coils (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Sat, 15 Nov 2008 09:57:55 -0500; Will, Yes. The LCA coils are identical for the 40-2CD and XM-240 but I would first replace the terminations with good stainless steel screws and then put a protective covering over same before replac; /archives//html/Towertalk/2008-11/msg00376.html (8,121 bytes)
3. Re: [TowerTalk] Connector Loss Question (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Tue, 26 Aug 2008 20:23:18 -0400; Steve etal, Sorry but the 0.5 in the first line on losses. That was obviously a typo. It should have been 0.05. You can see that by seeing that I gave an example and that value is correct. Thanks for; /archives//html/Towertalk/2008-08/msg00506.html (9,199 bytes)
4. Re: [TowerTalk] Connector Loss Question (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Sun, 24 Aug 2008 18:41:41 -0400; Hi Manius, The insertion loss of a good N connector is equal to the square root of F (in GHz) times a constant (K). The constant for a single N connector is 0.5. Therefore, at 23 CM (1.3 GHz) the los; /archives//html/Towertalk/2008-08/msg00477.html (8,221 bytes)
5. Re: [TowerTalk] Matching Sections - Modified Yagi (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Mon, 12 May 2008 20:06:07 -0400; John and company, The "T" match in this antenna configuration first matches the driven element of the antenna to a balanced 200 Ohms. The combination of the length of the driven element and the Tee s; /archives//html/Towertalk/2008-05/msg00232.html (14,574 bytes)
6. Re: [TowerTalk] Radial length (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Sat, 22 Mar 2008 11:04:07 -0400; Jim etal, I also measured the effect of ground radials when I loaded my 70 foot tower (with 40 meter beam on top) on 160 meters. I used an HP 9753C network analyzer and a non resonant loop about 6 fe; /archives//html/Towertalk/2008-03/msg00419.html (13,102 bytes)
7. Re: [TowerTalk] Skyhawk design (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Thu, 02 Aug 2007 20:39:25 -0400; Greg, The impedance of the Skyhawk is about 50 Ohms resistive. The balun is a ferrite one (similar to W2DU) made by Cal Aviation. 73, Joe, W1JR _______________________________________________ _______; /archives//html/Towertalk/2007-08/msg00080.html (7,697 bytes)
8. Re: [TowerTalk] Current choke beads (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Sat, 28 Jul 2007 17:33:41 -0400; Hi Ian, Great to hear from you. Was thinking of you and Nadine when we heard about all the flooding in Oxford. That was a great visit with both of you. I'll bet you're glad you're not there now! Than; /archives//html/Towertalk/2007-07/msg01083.html (11,593 bytes)
9. Re: [TowerTalk] Current choke beads (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Fri, 27 Jul 2007 16:03:43 -0400; Hi Arnie, I guess there has been a discussion on baluns going on. Let me add a few comments on the subject. First off, there are alternatives or choices on transmission line types used in coax baluns; /archives//html/Towertalk/2007-07/msg01030.html (18,274 bytes)
10. Re: [TowerTalk] Cushcfraft 402CD modification for 30m band (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Thu, 06 Apr 2006 11:08:37 -0400; Carlos, I am using a modified 30 meter beam with parts from a 40-2CD. Basically, the top hat rods (36" elements after the inductor) are removed. Next, the spacing is reduced to 140". The boom could b; /archives//html/Towertalk/2006-04/msg00136.html (8,208 bytes)
11. Re: [Antennaware] "Shorty-40" dimensions needed (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Mon, 05 Sep 2005 19:34:24 -0400; Hi Charlie, Sounds like the Cushcraft model 40-2CD. There are no traps. They are loading coils and a capacity hat. The data sheet/assembly manual should be on the Cushcraft website. 73, Joe, W1JR ___; /archives//html/Towertalk/2005-09/msg00150.html (8,244 bytes)
12. Re: [TowerTalk] M2 Readout Loosing Pulses ? (score: 1): Author: "Joe Reisert, W1JR" <W1JR@arrl.net>; Date: Mon, 27 Jun 2005 06:59:20 -0400; Terry, I had the same problem with 6 conductor line. I guess 60 Hz pickup. I don't know if capacitance on the line is a problem but I used RG59 coax on the reed relay line and the problem went away.; /archives//html/Towertalk/2005-06/msg00595.html (8,906 bytes)
13. Re: [TowerTalk] XM240 Question (score: 1): Author: Joe Reisert <W1JR@arrl.net>; Date: Thu, 04 Nov 2004 20:27:01 -0500; Pat, I made very careful VSWR and F/B ratio tests on my XM-240. Then I attached a 1.0" wide aluminum strap around the center of the reflector and bolted it to the channel to ground same. Then I caref; /archives//html/Towertalk/2004-11/msg00091.html (11,747 bytes)
14. Re: [TowerTalk] Grote Reber (score: 1): Author: Joe Reisert <W1JR@arrl.net>; Date: Thu, 23 Sep 2004 18:51:22 -0400; Jim, While in Australia, I think Grote was studying some other phenomenon at very low frequencies (instead of at HF). He recently became a silent key. A story on his life, I believe, was in a recent; /archives//html/Towertalk/2004-09/msg00547.html (8,446 bytes)
15. re: [TowerTalk] weatherproof boxes (score: 1): Author: Joe Reisert <W1JR@arrl.net>; Date: Fri, 19 Mar 2004 11:15:52 -0500; Pete, Yes, these Rubbermaid boxes are cheap but in a year or so, the UV rays from the sun will start to make the box brittle and eventually fall apart. This is from my experience using one of these b; /archives//html/Towertalk/2004-03/msg00331.html (9,779 bytes)
16. Re: [TowerTalk] 40 Meter Vertical Construction (score: 1): Author: Joe Reisert <W1JR@arrl.net>; Date: Thu, 13 Nov 2003 11:08:55 -0500; Gordon, One of the "rules-of-thumb" used with tubing is to overlap 2-3 times the diameter of the element. Therefore, 5" is great on 1.625" tubing while only about 2-1/2" is needed on the .875" diamet; /archives//html/Towertalk/2003-11/msg00379.html (10,892 bytes)
17. [TowerTalk] Re:EF Johnson 229-201 Variable Inductor (score: 1): Author: Joe Reisert <W1JR@arrl.net>; Date: Sun, 21 Sep 2003 14:54:34 -0400; Tower talkers, Does anyone on this reflector have the EF Johnson specifications/data sheet on their model 229-201 rotary inductor? If so, could you please send me what they claim for power, inductian; /archives//html/Towertalk/2003-09/msg00532.html (7,464 bytes)
18. Re: [TowerTalk] Replacement relays for the Ameritron RCS 8V (score: 1): Author: Joe Reisert <W1JR@arrl.net>; Date: Wed, 17 Sep 2003 18:52:27 -0400; Bill, I purchased replacement relays direct from Ameritron in Mississippi at a reasonable price. 73, Joe, W1JR At 03:05 PM 9/16/2003, Cqtestk4xs@aol.com wrote: I am looking for a source of replacemen; /archives//html/Towertalk/2003-09/msg00461.html (9,038 bytes)
19. [TowerTalk] T-Connectors (score: 1): Author: W1JR@arrl.net (Joe Reisert); Date: Wed Aug 13 11:21:00 2003; Jim, I know of a source that I used when I had my antenna company for Type "F" female "T" connectprs. It's not Amphenol and I don't know if they will sell to an individual. Maybe they'll send you a s; /archives//html/Towertalk/2003-08/msg00419.html (8,969 bytes)
20. [TowerTalk] W1JR Balun: choking impedance and power dissipation (score: 1): Author: W1JR@arrl.net (Joe Reisert); Date: Sat Jul 19 10:20:57 2003; Hi Tony, You can surely do what you suggest. The 12 turn one on a 2.4" OD 61 material toroid is very good from 40-10 (and even to 80 meters) meters with high impedance and no resonances. To get to 16; /archives//html/Towertalk/2003-07/msg00327.html (13,241 bytes)

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