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21. Re: [TowerTalk] BigIR question (score: 1): Author: "john@kk9a.com" <john@kk9a.com>; Date: Thu, 7 Dec 2017 12:42:17 -0500; If that is really what is occuring and if Doug is only using 1500 watt CW there is a design flaw. This can be easily remedied as you suggested and it would be worth trying, even if the SteppIR is not; /archives//html/Towertalk/2017-12/msg00068.html (14,311 bytes)
22. Re: [TowerTalk] BigIR question (score: 1): Author: "David Robbins" <k1ttt@verizon.net>; Date: Thu, 07 Dec 2017 12:53:28 -0500; Or do like I did after burning up several of the M2 Yagi baluns (really just small ferrite binocular chokes)... replace them with coax air core chokes. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.n; /archives//html/Towertalk/2017-12/msg00069.html (14,390 bytes)
23. Re: [TowerTalk] BigIR question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 7 Dec 2017 10:29:22 -0800; Air core coils are of questionable value as common mode chokes, for reasons I articulated in k9yc.com/RFI-Ham.pdf The better solution is a ferrite core choke with balls. :) 73, Jim K9YC _____________; /archives//html/Towertalk/2017-12/msg00070.html (9,571 bytes)
24. Re: [TowerTalk] BigIR question (score: 1): Author: Wes Stewart <wes_n7ws@triconet.org>; Date: Thu, 7 Dec 2017 11:50:03 -0700; Legal power for classic AM on 80 meters is 375 W of carrier power. If you run this then the PEP is 1500W and the antenna is within spec. I was using a vertical antenna rated for 1500 watts, but it f; /archives//html/Towertalk/2017-12/msg00072.html (9,903 bytes)
25. Re: [TowerTalk] BigIR question (score: 1): Author: "David Robbins" <k1ttt@verizon.net>; Date: Thu, 07 Dec 2017 14:25:40 -0500; reasons I articulated in k9yc.com/RFI-Ham.pdf Air core is better than cracked ferrites and melted coax in those little pvc cans!! And can be done quickly with materials at hand without having to wor; /archives//html/Towertalk/2017-12/msg00074.html (9,693 bytes)
26. Re: [TowerTalk] BigIR question (score: 1): Author: "Joe Giacobello, K2XX via TowerTalk" <towertalk@contesting.com>; Date: Thu, 07 Dec 2017 14:45:27 -0500; I have used my Crankir for about four years when on month long vacations in Florida. I don't use the single adjustable length radial that Steppir provides. I use four insulated ~20 ga. radials cut fo; /archives//html/Towertalk/2017-12/msg00076.html (12,133 bytes)
27. Re: [TowerTalk] BigIR question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 7 Dec 2017 12:01:54 -0800; On 12/7/2017 11:23 AM, David Robbins wrote: Air core coils are of questionable value as common mode chokes, for reasons I articulated in k9yc.com/RFI-Ham.pdf The better solution is a ferrite core cho; /archives//html/Towertalk/2017-12/msg00079.html (10,865 bytes)
28. Re: [TowerTalk] BigIR question (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 7 Dec 2017 12:04:04 -0800; Exactly the right thing. The single radial is a stroke job. It's cute, it makes the antenna close to resonance, but it's a lousy counterpoise. 73, Jim K9YC ___________________________________________; /archives//html/Towertalk/2017-12/msg00080.html (10,054 bytes)
29. Re: [TowerTalk] BigIR question (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Thu, 7 Dec 2017 15:41:44 -0600; That's a whole lot more average power than a 1500 watt SSB signal. 73 Gary K4FMX _______________________________________________ _______________________________________________ TowerTalk mailing list; /archives//html/Towertalk/2017-12/msg00084.html (10,924 bytes)
30. [TowerTalk] BigIR question (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 8 Dec 2017 05:43:42 -0800; <Or do like I did after burning up several of the M2 Yagi baluns (really just <small ferrite binocular chokes)... replace them with coax air core chokes. <Air core is better than cracked ferrites and; /archives//html/Towertalk/2017-12/msg00088.html (11,633 bytes)
31. Re: [TowerTalk] BigIR question (score: 1): Author: W0MU Mike Fatchett <w0mu@w0mu.com>; Date: Fri, 8 Dec 2017 10:08:09 -0700; I am a mod on the SteppIR yahoo group and I have never heard of this before. We have many many BigIR users and if this was the case it would be a big issue. It does sound like there is a problem wi; /archives//html/Towertalk/2017-12/msg00089.html (14,291 bytes)
32. Re: [TowerTalk] BigIR question (score: 1): Author: "Doug Turnbull" <turnbull@net1.ie>; Date: Fri, 08 Dec 2017 18:20:47 -0500; Hello Mike, I would like to know more as well. The antenna is very high Q when using the loading coil. I indicated that the BW was 40 KHz previously but it really is closer to 10 to 20 KHz when using; /archives//html/Towertalk/2017-12/msg00095.html (17,208 bytes)
33. Re: [TowerTalk] BigIR question (score: 1): Author: Grant Saviers <grants2@pacbell.net>; Date: Fri, 8 Dec 2017 16:43:00 -0800; Mike, Note there are 3 coil versions for the 80m BigIR with different power ratings. So which one is being discussed? http://www.steppir.com/wp-content/uploads/2011/10/80m-Coil-Kit-Assembly.pdf Pleas; /archives//html/Towertalk/2017-12/msg00096.html (15,923 bytes)
34. Re: [TowerTalk] BigIR question (score: 1): Author: Wes Stewart <wes_n7ws@triconet.org>; Date: Mon, 11 Dec 2017 14:20:17 -0700; So? If they spec the antenna in PEP that suggests it's peak limited. If it's average power limited, then they should say so. Apparently they did, after the fact. 73 Gary K4FMX --Original Message--; /archives//html/Towertalk/2017-12/msg00116.html (11,819 bytes)

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