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41. Re: Topband: Zo of an individual CAT5 twisted pair (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Tue, 13 Aug 2013 09:43:56 -0400
Yes, that's a complicated matter. The name and the function can get very confused if you don't know what you are doing. Any transformer can change the voltage from the primary to the secondary and th
/archives//html/Topband/2013-08/msg00173.html (13,084 bytes)

42. Re: Topband: How to detune a wire Inverted L? How to 'detune'electrical fence (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Thu, 15 Aug 2013 13:39:34 -0400
Tim The issue with the relay at the antenna is the time to close the contacts and avoid RF hot switch. I'm using a Jennings RJ1A-26S for years, just 4-6 milliseconds to close. Or you can use a sequen
/archives//html/Topband/2013-08/msg00212.html (9,034 bytes)

43. Re: Topband: CAT5 for Flag Antenna Feedline ? (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Mon, 9 Sep 2013 20:08:39 -0400
Bob Here the missing part of my original post to motivate you to try a single twisted pair. See bellow Ilian's comments about the performance of the RX antenna. Illian was not detuning his TX antenna
/archives//html/Topband/2013-09/msg00133.html (12,277 bytes)

44. Re: Topband: 3B9EME (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Mon, 9 Sep 2013 23:04:15 -0400
That's just pure propagation, 160m duct is the most common mode for most DX. 3B9 was peaking 599 in Texas and 589 in KP2. The signal was just not getting down here in South Florida due Es clouds. The
/archives//html/Topband/2013-09/msg00145.html (8,107 bytes)

45. Re: Topband: WLW (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Tue, 17 Sep 2013 07:50:21 -0400
Here is the K7AGE posts video of WLW's 1932 500,000 Watt AM transmitter http://forums.qrz.com/showthread.php?398944-K7AGE-posts-video-of-WLW-s-1932- 500-000-Watt-AM-transmitter Enjoy it Regards JC N4
/archives//html/Topband/2013-09/msg00233.html (6,733 bytes)

46. Re: Topband: Beverage antenna terminations (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Tue, 24 Sep 2013 21:58:35 -0400
Bruce I lost several resistors on my WF until I started to use NTE 3 W Metal on the vertical Waller Flag and on the Horizontal WF I am using an array of 9 parallel/series. http://www.nteinc.com/resis
/archives//html/Topband/2013-09/msg00332.html (10,467 bytes)

47. Re: Topband: Steady Carrier on 80 CW (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Sat, 2 Nov 2013 22:01:48 -0400
Hi guys I'm in Ft Lauderdale EL96ub and the carrier on 3501.6 is s9+10 coming around 350 degree with some QSB. Regards JC N4IS Hi Guys, K5ESW reported the following : The 3501.5 carrier is audible in
/archives//html/Topband/2013-11/msg00066.html (10,958 bytes)

48. Re: Topband: FW: Steady Carrier on 80 CW (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Sun, 3 Nov 2013 08:38:27 -0500
I just checked 3501.6 and I have no copy or trace during daytime. I'm confirming the 350 degree direction from Ft Lauderdale JC 73's N4IS _________________ Topband Reflector
/archives//html/Topband/2013-11/msg00083.html (9,824 bytes)

49. Re: Topband: Digital mode spurious issues (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Mon, 30 Dec 2013 21:50:47 -0500
Tom, Mike is right, the issue with audio overload is complex for most of new radios, most of them have A/D just at the MIC input, if the A/D overloads the RF chain is compromised. These radios have n
/archives//html/Topband/2013-12/msg00287.html (11,532 bytes)

50. Re: Topband: Single antenna port xcvr but want to employ separate receive antenna (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Mon, 13 Jan 2014 11:33:21 -0500
Hi James There are several solutions for a separated receive port. However let me comment on some details, 1- Small Delta loop. To be a receiver antenna the antenna gain need to be less than 20 db, w
/archives//html/Topband/2014-01/msg00098.html (12,758 bytes)

51. Re: Topband: Compromise vertical loading questions (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Wed, 29 Jan 2014 08:38:43 -0500
Hi Bjorn How much I can improve by moving the coil up. What improvement should I expect if center loading at about 7 meter? How about moving the coil all the way up to the top loading spokes? Is it w
/archives//html/Topband/2014-01/msg00313.html (7,982 bytes)

52. Re: Topband: circular polarization on 160m (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Tue, 4 Feb 2014 12:45:28 -0500
Hi Carl and top-band lovers I would like to mention Chapter 7.6 as well, polarization matching, and also 7.7 Fading. I started developing my HWF early 2009 and I think there is no more to squeeze fro
/archives//html/Topband/2014-02/msg00064.html (12,533 bytes)

53. Re: Topband: circular polarization on 160m (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Wed, 5 Feb 2014 13:55:59 -0500
Tom The way I see it is if the rate is not 0.546 uS or so, you do not have circular polarization.You have a slowly rotating wave, and the sense of the RX antenna would be meaningless unless you could
/archives//html/Topband/2014-02/msg00088.html (11,392 bytes)

54. Re: Topband: circular polarization on 160m (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Wed, 5 Feb 2014 22:44:40 -0500
James You brought a good article about HF propagation, however the behavor on 160m is different from HF. If you check on the KL7A arcticle figure 1 what is happening between 1 and 2 MHz you can see t
/archives//html/Topband/2014-02/msg00094.html (9,905 bytes)

55. Re: Topband: Shared Apex Loop Array (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Mon, 10 Feb 2014 21:54:01 -0500
Hi Jim The antenna geometry indicates that it should perform similar to a Waller Flag *under the same conditions*. << The perform under same conditions is expected, however the WF RDF is between 11.5
/archives//html/Topband/2014-02/msg00127.html (9,521 bytes)

56. Re: Topband: Shunt feeding the Skyneedle - new developments (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Sun, 23 Feb 2014 07:20:14 -0500
I'm sure it will play well in terms of keeping your transmitter happy but the relatively large bandwidth you are measuring is indicative of substantial loss in the system somewhere. This would be a
/archives//html/Topband/2014-02/msg00420.html (10,626 bytes)

57. Re: Topband: Crossed Field Antenna (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Thu, 10 Apr 2014 08:47:15 -0400
This antenna was evaluated before and published in QEX May June 2005 Just google >> Broadcast CFA antenna 73's N4IS --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behal
/archives//html/Topband/2014-04/msg00015.html (9,517 bytes)

58. Re: Topband: How Increase 160m power on FL2100z (score: 1)
Author: "JC N4IS" <n4is@comcast.net>
Date: Sun, 20 Apr 2014 10:57:22 -0400
I owned a FT2100Z for several years and the power on 160m was the same as other bands. I don't expect any design flaw. The original tubes are not available anymore, the 572's tubes manufactures nowad
/archives//html/Topband/2014-04/msg00042.html (8,280 bytes)

59. Re: Topband: Modeling the proverbial "vertical on a beach" (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Tue, 12 Aug 2014 08:03:55 -0400
Hi Guys I would say vertical "IN" the salt water. George AA7JV is my mentor about antennas, and his 160m vertical is at the pear, just 2 m from the salt water, the ground plane is a flat sheet SS met
/archives//html/Topband/2014-08/msg00091.html (23,166 bytes)

60. Re: Topband: Modeling the proverbial "vertical on a beach" (score: 1)
Author: "JC" <n4is@comcast.net>
Date: Sat, 16 Aug 2014 00:58:44 -0400
If it was really 10-20 dB, shore locations would stand out like a sore thumb compared to inland locations. Everyone from around New England is about the same. Heck, K3LR is on the Ohio/PA border and
/archives//html/Topband/2014-08/msg00151.html (15,467 bytes)


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