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Total 185 documents matching your query.

41. Re: Topband: DX window (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 29 Dec 2003 23:53:47 -0600
from K9DX > ... I do not know why is so I agree 100% with John. 5 kHz of protected spectrum has proven to work reasonably well. It probably needs to be moved (maybe 1820-25?) to let the JAs participa
/archives//html/Topband/2003-12/msg00279.html (9,180 bytes)

42. Re: Topband: 160 Meter BALUNS (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Tue, 30 Dec 2003 09:37:11 -0600
Hi Tom and all... I got the new QEX yesterday, and -- with excellent timing -- Zack Lau W1VT has published some of the same balun experiments that Tom has been working on. The results are essentially
/archives//html/Topband/2003-12/msg00287.html (9,853 bytes)

43. Re: Topband: Keying waveform (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Tue, 27 Jan 2004 10:30:02 -0600
Mark and all, This waveform is, as Tom notes, a classic example of shaping with an R-C time constant. The leading edge will not likely cause clicks, but at the turn-off point on the trailing edge the
/archives//html/Topband/2004-01/msg00268.html (8,587 bytes)

44. Re: Topband: BDR redux (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 6 Feb 2004 09:53:16 -0600
from W8JI out clamp -- Tom's note illustrates why AGC action in our receivers requires our attention -- right after phase noise, IMD dynamic range and key clicks. Simple first-order AGC loops (or 2nd
/archives//html/Topband/2004-02/msg00109.html (9,437 bytes)

45. Re: Topband: Powering preamp (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 6 Feb 2004 10:16:06 -0600
Pete, Check the ratings for the device itself, plus the design of the preamp. In general, higher voltage will result in higher quiescent current and better strong signal handling, but it might increa
/archives//html/Topband/2004-02/msg00111.html (7,602 bytes)

46. Re: Topband: Bev directions, accidental xmit (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 23 Feb 2004 16:30:49 -0600
Dave 1) A Beverage NNW (e.g. 320 deg.) from Texas would be useful for JA and other Far East DX locations, and for W7, VE6/7 and Alaska in ragchew or contest situations. 2) The AY Technologies TRX-9 i
/archives//html/Topband/2004-02/msg00309.html (8,769 bytes)

47. Topband: Elevated K9AY Loop (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Thu, 25 Mar 2004 22:52:52 -0600
Topbanders, I just received a note from 4F2KWT (via WX0B) -- although it was a testimonial that his new K9AY loop was working well, an important technical note was also included. Gil is using a singl
/archives//html/Topband/2004-03/msg00270.html (7,532 bytes)

48. Re: Topband: phase (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 14 Apr 2004 10:58:45 -0500
from N2EA... Jim, If the waveform is symmetrical (like the sine waves of RF), there is no difference between a "flip" of polarity and a 180 degree delay -- other than a small loss in the delay line o
/archives//html/Topband/2004-04/msg00078.html (7,494 bytes)

49. Re: Topband: phase (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Wed, 14 Apr 2004 12:25:32 -0500
from W8JI -- I have also listened in two directions at the same time, sometimes using the transmitting antenna as the 2nd antenna. In a contest situation, this has proven highly valuable -- Beverages
/archives//html/Topband/2004-04/msg00081.html (8,993 bytes)

50. Re: Topband: New High-Performance Beverage Pre-amp (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Thu, 15 Apr 2004 14:07:13 -0500
-- I'm also interested in hearing about the input IP3 performance. The new InGaP HBT MMICs are interesting because they can run more power and have lower 1/f noise than earlier GaAs MESFET amps. So
/archives//html/Topband/2004-04/msg00106.html (8,468 bytes)

51. Re: Topband: Loop for RX (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Fri, 7 May 2004 14:42:42 -0500
Osten, There are many variable factors that affect receiving antennas. At one past QTH, there was so much local noise that nothing helped -- I tried a coaxial loop and a EWE with no improvement over
/archives//html/Topband/2004-05/msg00007.html (8,362 bytes)

52. Re: Topband: AY Technologies Remote Receiving Antenna Switch (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 10 May 2004 00:19:25 -0500
Jeff and fellow Topbanders, I appreciate the publicity, and yes, it can be seen and discussed (and bought) at the Array Solutions booth at Dayton. I would like to get as much feedback as possible on
/archives//html/Topband/2004-05/msg00016.html (7,762 bytes)

53. Re: Topband: loops sharing a small power pole (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 14 Jun 2004 23:04:36 -0500
Dave, Things located "inside" the loop will couple efficiently and it won't take much noise to create a problem. On the other hand, if the electrical wiring is quiet, it may work acceptably. If it's
/archives//html/Topband/2004-06/msg00048.html (7,916 bytes)

54. Re: Topband: New style 1.8MHz antenna (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Thu, 17 Jun 2004 23:56:00 -0500
Ford, A patent can be gotten for anything that is "unique" -- with a good attorney and enough desire, some unique characteristic can be found for just about anything. There is no requirement that the
/archives//html/Topband/2004-06/msg00053.html (7,903 bytes)

55. Re: Topband: Q: Measuring Height? (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Sat, 21 Aug 2004 18:17:04 -0500
Eric, Your first comment is probably right -- mainly because the dimensions and shape of a EWE can vary significantly and still provide a useful pattern. For most antennas that interact with ground,
/archives//html/Topband/2004-08/msg00044.html (7,668 bytes)

56. Re: Topband: Rx antennas questions (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 20 Sep 2004 11:56:25 -0500
Javier, The relay in the RIP-1 is rated at 1 or 2 kV DC breakdown -- proximity to the TX antenna should not be a problem unless you are right on top of it. My own Beverage installations have been as
/archives//html/Topband/2004-09/msg00093.html (7,774 bytes)

57. Re: Topband: K9AY Operations (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 20 Sep 2004 12:41:17 -0500
Kelley, Once the termination is set for a given frequency, it should not require adjustment until the soil has gotten much drier or wetter. However, some Vactrol models have very poor temperature sta
/archives//html/Topband/2004-09/msg00094.html (7,864 bytes)

58. Re: Topband: K9AY beverage transformers - did I fry them? (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 25 Oct 2004 13:10:41 -0500
Dave, The TRX-9 XFMRs should handle 100W briefly without problems -- the cores are quite large and the surge protector has 85V breakdown and 20A continuous current rating. At 1 kW, it's all different
/archives//html/Topband/2004-10/msg00140.html (8,623 bytes)

59. Re: Topband: 160m noise (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Tue, 9 Nov 2004 10:33:05 -0600
-- While common-mode feedline pickup is a known culprit for this type of noise, I'll put better odds on direct radiation. The quick test is whether the noise changes as the pattern is switched. If i
/archives//html/Topband/2004-11/msg00054.html (9,167 bytes)

60. Re: Topband: FT-240-77 Toroid Impedance R + jX Components (score: 1)
Author: "K9AY" <k9ay@k9ay.com>
Date: Mon, 27 Dec 2004 09:55:13 -0600
______ Good info, Mike This is close to what I see for 77 material in smaller size toroids and beads, with some variation in the frequency of peak impedance. Readers should not interpret the data as
/archives//html/Topband/2004-12/msg00314.html (8,507 bytes)

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