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21. Re: Topband: My Turn For a Brain Pick - Sanity Check (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Fri, 7 Jun 2013 09:31:26 -0400
Jim, Equipment wise, is this reciprocal if you use the array for your receive measurements? Jim, KR9U I'm building a simple 2-el vertical array for 40M, with one element driven against radials, and a
/archives//html/Topband/2013-06/msg00019.html (8,694 bytes)

22. Re: Topband: AutoEZ (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Fri, 20 Sep 2013 18:06:13 -0400
Richard, 4NEC2 does current sources. It also supports NEC4 and has good graphics. What other deficiencies are you missing? Years ago, I tried both EZ and 4NEC2. I stayed with 4NEC2. Jim, KR9U --Origi
/archives//html/Topband/2013-09/msg00299.html (8,290 bytes)

23. Re: Topband: Wideband interference (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Fri, 13 Dec 2013 13:50:06 -0500
This sounds like it could be an appliance or light on either a timer or a photocell that is tied to daylight/night hours. Jim, KR9U The consensus among RFI professionals who hang out on the RFI list
/archives//html/Topband/2013-12/msg00145.html (8,474 bytes)

24. Re: Topband: Ends for older Phillystran (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Tue, 14 Jan 2014 09:22:52 -0500
lines. towers, had Lloyd, Was this the Phillistran that did not have the inner strands in a rope configuration or were they just straight fibers? Thanks, Jim - KR9U _________________ Topband Reflecto
/archives//html/Topband/2014-01/msg00111.html (9,496 bytes)

25. Re: Topband: circular polarization on 160m (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 5 Feb 2014 21:25:09 -0500
Tom, Perhaps it is much simpler than that. Recalling KL7AJ's article, http://www.nxtbook.com/nxtbooks/arrl/qst_201203/index.php#/42 he states that the magnetic field of the earth splits every HF sign
/archives//html/Topband/2014-02/msg00093.html (12,844 bytes)

26. Re: Topband: circular polarization on 160m (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Thu, 6 Feb 2014 00:21:26 -0500
Jose, I am only presenting the possibility that if the ionosphere (where 160 propagation happens) isn't uniformly smooth and instead consists of "warps, wrinkles and tilts" that in a *dynamic ionosph
/archives//html/Topband/2014-02/msg00095.html (11,160 bytes)

27. Re: Topband: Shared Apex Loop Array (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Mon, 10 Feb 2014 17:29:56 -0500
The antenna geometry indicates that it should perform similar to a Waller Flag *under the same conditions*. The Waller flag though, (as Tom has alluded to) has more spacing between the loops and is u
/archives//html/Topband/2014-02/msg00124.html (10,463 bytes)

28. Re: Topband: 50 ohm direct burial coax cable (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Fri, 13 Jun 2014 17:03:52 -0400
This does however, slightly narrow the bandwidth of the antenna if the coax loss is small because as you move away from the perfect 1/2 wave point the coax will start to show SWR. For monobanders thi
/archives//html/Topband/2014-06/msg00086.html (9,249 bytes)

29. Re: Topband: Deployable radials for 80/160M - Summary (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 25 Jun 2014 10:46:49 -0400
One note of caution, based on personal experience. I used some coated stranded #20 ga. wire here for my radials, and also for a electric dog fence. A couple years later, during the winter the dog fen
/archives//html/Topband/2014-06/msg00202.html (12,635 bytes)

30. Re: Topband: Rig Comparisons (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sat, 2 Aug 2014 19:06:03 -0400
It really doesn't matter how much power the amplifier is outputting. A simple explanation is that a sample of the output is inversely fed back and combined with the input. As was mentioned before, th
/archives//html/Topband/2014-08/msg00007.html (9,927 bytes)

31. Re: Topband: Rig Comparisons (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sat, 2 Aug 2014 22:53:43 -0400
Rick, Is the report public? Do you have a link to it? Jim - KR9U This doesn't even sound like the same system that was in the report. Always good to have a second opinion. Maybe you should have writt
/archives//html/Topband/2014-08/msg00012.html (9,245 bytes)

32. Re: Topband: Rig Comparisons (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Sun, 3 Aug 2014 10:07:45 -0400
Rick, I can see where the approach in the paper could be a solution to existing transmitting systems. Unless the semantics of pre-distortion have eluded me, a closed loop which is integral to the des
/archives//html/Topband/2014-08/msg00015.html (10,529 bytes)

33. Re: Topband: Shunt feeding tower (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 27 Aug 2014 10:18:42 -0400
Pete, et al. It really helps if you know the self-resonant frequency of the tower. ON4UN goes into a fair amount of detail in his Low-Band DXing book. There are examples and graphs that may or may no
/archives//html/Topband/2014-08/msg00251.html (10,350 bytes)

34. Re: Topband: Anyone using WSPR or WSPR-X? (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Mon, 1 Sep 2014 11:31:13 -0400
Mike, I have not yet experimented with WSPR on Topband, but I think if enough stations were activated, it could be a great way to increase the awareness of path openings and propagation information a
/archives//html/Topband/2014-09/msg00001.html (8,736 bytes)

35. Re: Topband: Radial Wire (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 22 Oct 2014 23:17:32 -0400
Tom, On your mention of Silver solder, do you mean typical circuit board silver solder or the "real" silver solder, such as used on copper tubing in high pressure refrigeration systems? I used the "r
/archives//html/Topband/2014-10/msg00123.html (10,100 bytes)

36. Re: Topband: Non-resonant receive antennas (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Thu, 18 Dec 2014 11:36:27 -0500
Not wanting to distract from this thread too much, but I'd like to ask a question of the group. If one had the opportunity to install two receiving antennas (such as loops EWE's etc.) for Topband in
/archives//html/Topband/2014-12/msg00296.html (10,245 bytes)

37. Re: Topband: Non-resonant receive antennas (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Thu, 18 Dec 2014 13:30:22 -0500
Thanks JC, I agree that the RDF number is significant when evaluating a receive antenna. I agree that no one antenna system will work all of the time. Consider we have two scenarios: One RX antenna s
/archives//html/Topband/2014-12/msg00300.html (12,184 bytes)

38. Re: Topband: 160m Sloping Vertical Antenna? (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Wed, 24 Dec 2014 14:10:14 -0500
I used to use a similar method on 80 meters. Why not feed it (them) at the top? Jim - KR9U tower sits on a small hill so the downside of the tower is sloping. If I hang a wire off the top, I can brin
/archives//html/Topband/2014-12/msg00386.html (8,489 bytes)

39. Re: Topband: Ground rods (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Fri, 26 Dec 2014 15:21:23 -0500
Occasionally in the summer, I have to water my 4 ft. ground rod under the K9AY array even though I also have 8 radials under it. Jim - KR9U ________________ Common thinking: Long ground rods are not
/archives//html/Topband/2014-12/msg00400.html (8,496 bytes)

40. Re: Topband: Silver solder (score: 1)
Author: "James Wolf" <jbwolf@comcast.net>
Date: Thu, 1 Jan 2015 20:04:08 -0500
My whole buried radial system uses this type of silver solder to connect the ground radials which are 1/2 in. copper tubing between ground rods. Each ground rod radial is also soldered to the Rohn to
/archives//html/Topband/2015-01/msg00006.html (8,936 bytes)

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