Search String: Display: Description: Sort:

Results:

References: [ +from:W4EF@dellroy.com: 313 ]

Total 313 documents matching your query.

61. Re: Topband: Omni 6 Plus (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 4 Feb 2004 09:15:34 -0800
Yes, I observed the same thing last Friday when I compared an unmodified FT-1000 to a TS-850. At +1KHz offset, the FT-1000 clicked like mad whereas the TS850 was completely clean. 73 de Mike, W4EF...
/archives//html/Topband/2004-02/msg00044.html (8,113 bytes)

62. Re: Topband: Receivers, Noise Blankers and Key Clicks (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 4 Feb 2004 22:06:42 -0800
Yes, that is correct, Barry. The rig I was referring to is the original FT-1000. The noise sidebands I measured were pretty consistent with the TX composite noise measured in the ARRL test report, so
/archives//html/Topband/2004-02/msg00054.html (9,469 bytes)

63. Re: Topband: Receivers, Noise Blankers and Key Clicks (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 4 Feb 2004 22:14:16 -0800
Steve, When I installed the Tom, W8JI's click mod into our club's FT-1000 last weekend, I noticed the same thing. Most of the screws holding the AF and IF boards to the chassis were barely snug. Now
/archives//html/Topband/2004-02/msg00055.html (10,248 bytes)

64. Re: Topband: Receivers, Noise Blankers and Key Clicks [Long] (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 5 Feb 2004 00:02:48 -0800
Brad, Actually that is one reason why I posted my comments. I have the same concern. Recently I have been doing a lot of so-called "off-the-air testing" and each time I do it, I come away with the sa
/archives//html/Topband/2004-02/msg00057.html (15,611 bytes)

65. Re: Topband: Receivers, Noise Blankers and Key Clicks (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 5 Feb 2004 20:46:22 -0800
virtually Tom, For folks in rural areas like yourself that are fairly distant from other amateurs, you are probably correct that 80-90dB is sufficient. Try living on the side of mountain in a metrop
/archives//html/Topband/2004-02/msg00096.html (11,401 bytes)

66. Re: Topband: Input Impedance of the FT1000/S-Meter Calibration issues (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 10 Feb 2004 23:58:06 -0800
Eric/Sinisa, My calculations agree with Rick's. A constant current source is not a good model of an antenna. An antenna is going to have a finite output impedance - presumeably something close to 50
/archives//html/Topband/2004-02/msg00154.html (10,995 bytes)

67. Re: Topband: Tailending etc (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 12 Feb 2004 22:09:39 -0800
of I think tailending is especially innappropriate when a DX station is operating simplex. If 9M0XXX is down in the noise and I am pretty sure but not 100% sure that he responds to my call with "W4EF
/archives//html/Topband/2004-02/msg00212.html (8,536 bytes)

68. [RFI] Re: Topband: Local Noise Environment (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 14 Feb 2004 10:27:29 -0800
Pete, In addition to recording it, you also might try looking at it with Digipan or some other program which has a waterfall display to see if the noise is pure white or if it perhaps has some fine
/archives//html/Topband/2004-02/msg00247.html (7,334 bytes)

69. [RFI] Re: Topband: Local noise environment (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 16 Feb 2004 22:06:18 -0800
and Doug, What is it about those capacitors banks that generates so much noise? In principle I would think that a capacitor wouldn't generate any extra noise unless there was some arcing going on in
/archives//html/Topband/2004-02/msg00265.html (8,688 bytes)

70. Topband: Great condx on Top Band (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 21 Feb 2004 17:33:30 -0800
Sounded like conditions were exceptional last night. Around 0830z I was hearing YV1DIG with Q5 sigs while listening from my home QTH here in Tujunga, Ca. I have never been able to hear him at all bef
/archives//html/Topband/2004-02/msg00299.html (8,222 bytes)

71. Re: Topband: VU2BGS (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 8 Mar 2004 06:48:45 -0800
are and BV4CT detect I agree. During the ARRL DX CW contest 2 weeks ago, there were good conditions on Friday night which appeared to correlate with a low K index and quiet auroral zone. VK3ZL was b
/archives//html/Topband/2004-03/msg00086.html (8,717 bytes)

72. Re: Topband: Conditions in Indiana (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 14 Mar 2004 04:29:06 -0800
least 1827 I don't think they are very loud Gary. Here in the Los Angeles area, they have never been stronger than 569, and are mostly 449 to 559. According to my map program, they are only about 110
/archives//html/Topband/2004-03/msg00176.html (7,660 bytes)

73. Re: [TowerTalk] KT34 & Shunt Feeding (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 29 Mar 2004 09:27:53 -0800
Phil, Could it be that what you are observing is just the decline in solar activity rather than a decline in your antenna sensitivity (10M is definitely not what it was 2 years ago)? With regard to t
/archives//html/Topband/2004-03/msg00319.html (9,759 bytes)

74. [RFI] Antenna Suggestions for 160 Noise Sniffing? (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 3 Apr 2004 18:18:20 -0800
I have some off-property noise sources on 160 meters. Probably computer monitors or switching power supplies. I was thinking of picking up one of those little Yaesu FT-817ND battery operated DC to li
/archives//html/Topband/2004-04/msg00019.html (6,920 bytes)

75. Re: Topband: Polarity and Phase (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 14 Apr 2004 23:00:42 -0700
an I think this last statement is a red herring, Jim. While it is true that a feedline will have a different phase shift at every frequency, that doesn't mean that this phase vs. frequency behavior i
/archives//html/Topband/2004-04/msg00094.html (16,392 bytes)

76. Re: Topband: Polarity and Phase (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 15 Apr 2004 21:13:09 -0700
I think I see where you are going with this. Your video cable example (in your other email) illustrates your point very well. For narrowband systems, a 180 degree phase shift, Tau/2 time delay, or a
/archives//html/Topband/2004-04/msg00111.html (12,913 bytes)

77. Re: Topband: PSK-31 (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 27 Apr 2004 15:45:56 -0700
Seems like another useful thing to do would be to run your VFO low in frequency relative to the station you are trying to work so that the audio tones coming from your soundcard out are all high rela
/archives//html/Topband/2004-04/msg00238.html (8,692 bytes)

78. Re: Topband: PSK-31 (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 27 Apr 2004 19:10:11 -0700
While its entirely possible to do what you describe, Rick, I think you pay a big bandwidth penalty when you slew the phase of the carrier while it is on. I am not entirely familiar with the PSK31 spe
/archives//html/Topband/2004-04/msg00245.html (10,158 bytes)

79. Re: Topband: PSK-31 (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 28 Apr 2004 19:43:33 -0700
raised-cosine Yes, you are quite correct about the importance of the ISI issue, Gary. And as Rick points out, you can't bandlimit the PSK signal without introducing harmful ISI if you use just any ol
/archives//html/Topband/2004-04/msg00255.html (10,253 bytes)

80. Re: Topband: RX antennas (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 9 May 2004 15:48:58 -0700
but noise Flags loop noise effective one hear When I was still back in college in Ohio, I shunt-fed my grandmother's TV tower for 160. I had an A3 tribander on top, along with an 80 meter dipole, an
/archives//html/Topband/2004-05/msg00014.html (9,004 bytes)

Current List: 61 - 80
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]
This search system is powered by Namazu