Mail Archive Search: <+from:w8ji@contesting.com>

Results:

References: [ +from:w8ji@contesting.com: 1348 ]

Total 1348 documents matching your query.

361. Topband: High Z vs Low Z shunt feed tower (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sun, 5 Nov 2000 18:50:04 -0500; Hi Ford, In most cases ground losses will dominate system losses, and so feed system errors won't make a noticeable difference. But if you are splitting hairs the following is true. The system will h; /archives//html/Topband/2000-11/msg00033.html (8,979 bytes)
362. Topband: High Z vs Low Z shunt feed tower (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 6 Nov 2000 21:03:36 -0500; The 200 pF doorknob, assuming the R at that point where it is in series is 450 ohms (allowing you to cancel reactance with that capacitor), carries 1.8 amperes. The reactance of the capacitor is 442; /archives//html/Topband/2000-11/msg00044.html (12,115 bytes)
363. Topband: Unident Signals and Dipole (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 13 Nov 2000 19:18:30 -0500; Hi Bill, Antennas radiate like they receive. If the ladder line is properly installed and fed in balance, the radiation will be insignificant. If the radiation contribution of the feedline is 40 dB d; /archives//html/Topband/2000-11/msg00066.html (7,377 bytes)
364. Topband: Dipole and Ladder Line (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 13 Nov 2000 22:13:10 -0500; Hi Thomas, I don't understand why you say a balanced line is "never truly balanced". While it is true a line with unequal and not-exactly-opposite currents will radiate, that also applies to coaxial; /archives//html/Topband/2000-11/msg00069.html (7,880 bytes)
365. Topband: Long Path (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Tue, 14 Nov 2000 22:35:02 -0500; Hi All, I find the same or a very similar thing John. When the signal skews here (and it does so quite often on long distance paths, even when not near the poles), it generally has no relationship to; /archives//html/Topband/2000-11/msg00080.html (8,195 bytes)
366. Topband: Wide band noise (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Fri, 17 Nov 2000 08:38:57 -0500; This morning a very strong wide band noise (sounded like spread spectrum transmission) appeared from the northwest. It faded and peaked, and so was not groundwave. After sunrise, it faded with signal; /archives//html/Topband/2000-11/msg00087.html (7,107 bytes)
367. Topband: SSW propagation on 160m (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Fri, 17 Nov 2000 17:58:43 -0500; K3NA: KH6O: It certainly is valid to question minor lobe response from some antennas, but I don't think that is the cause of skewed signals. I use multiple arrays that are very well separated, with v; /archives//html/Topband/2000-11/msg00096.html (8,563 bytes)
368. Fw: Topband: Beverage height experiment results (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Wed, 22 Nov 2000 17:58:59 -0500; Hi Jeff, Mutual coupling is mutual coupling. It is not affected by resonance. I think what has misled you is that non-resonant guyline or nonresonant antennas near other antennas absorb and re-radia; /archives//html/Topband/2000-11/msg00138.html (8,194 bytes)
369. Topband: Beverage height experiment results (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Wed, 22 Nov 2000 18:17:53 -0500; Hi Rick, On 40 meters, I seem to find low height Beverages are better. My ten foot high wires give me the impression they are not nearly as good on 40 as my six foot high antennas. On 80, I seem to s; /archives//html/Topband/2000-11/msg00142.html (9,377 bytes)
370. Topband: Re: [psk31] Question about 160 meters (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 23 Nov 2000 08:27:41 -0500; Hi Peter, The IARU and the ARRL need to meet someplace for lunch, and bring a few long-time 160 operators along. Both the IARU and the ARRL are out-of-touch with the real world, and each other. The A; /archives//html/Topband/2000-11/msg00145.html (8,619 bytes)
371. Topband: Skew path (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Fri, 24 Nov 2000 03:43:07 -0500; Local sunrise about 1200Z or so. 11/23 was an excellent example of the SW skew to Asia on 160 that occurs on somewhat rare occasions. At 1120 or so 9M6MA and the JA's were SW, and of course I receive; /archives//html/Topband/2000-11/msg00155.html (7,010 bytes)
372. No subject (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 24 Nov 2000 21:28:04 -0500; I've been in a discussion (man this stuff takes up time) with the person who picked 1838 as a PSK frequency. We now have a meeting of the minds that 1838 is not and was not a good choice for this reg; /archives//html/Topband/2000-11/msg00162.html (7,534 bytes)
373. Topband: 160 skew path to JA (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 26 Nov 2000 23:56:01 -0500; Both days of the contest the early path to JA was skewed SW to JA. The normal NW path was open only near sunrise on Saturday morning (quite good) and not open at all on Sunday. Of course it was the s; /archives//html/Topband/2000-11/msg00171.html (6,828 bytes)
374. Topband: Loop-family antenna notes (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 28 Nov 2000 21:40:25 -0500; Hi Larry, Remember what a loop is. Near the loop it has response to anything that runs in almost any direction. The only place it has zero response is if the external conductor crosses the loops cond; /archives//html/Topband/2000-11/msg00190.html (8,503 bytes)
375. Topband: 160M Bandpass filter drawing. K0FF (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 3 Oct 2000 10:15:18 -0400; Hi Earl, A notch would be my first reaction also, but the component values required are not commonly available when nulling 200 kHz. Also padding the trap to frequency would be a "chore". The most si; /archives//html/Topband/2000-10/msg00014.html (8,304 bytes)
376. Topband: 4W/N6FF (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sun, 8 Oct 2000 08:05:50 -0400; If anyone works the 4W team, they might see if they can try sunset at 4W for stateside on 160m. On many many days, the sunset peak on the west end of the path is just as strong or stronger than the s; /archives//html/Topband/2000-10/msg00044.html (7,300 bytes)
377. Topband: All PSK31 Enthusiasts (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 9 Oct 2000 16:36:12 -0400; The main problem with PSK-31 in weak signal areas is how the TX signal is generated! The PSK signal is generated by feeding a low level audio signal from a soundblaster card into the audio input of; /archives//html/Topband/2000-10/msg00057.html (8,006 bytes)
378. Topband: PSK 31 Enthusiast and others (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Tue, 10 Oct 2000 14:00:33 -0400; I hate to add one more post to this, but we all need to remember how PSK is generated! It is quite often NOT the pure tone it is assumed to be. I'd agree with Peter, but for slightly different reason; /archives//html/Topband/2000-10/msg00065.html (7,982 bytes)
379. Topband: Beverage Front to Back Non-exsistant (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sat, 14 Oct 2000 15:03:19 -0400; At what frequency Pete? At the upper end of the BC band, you should still see F/B (it will be 1 wl long electrically or longer) but at the bottom of the BC band the Beverage will only be 1/3 wl long; /archives//html/Topband/2000-10/msg00084.html (7,932 bytes)
380. Topband: Beverage length (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sat, 14 Oct 2000 15:03:19 -0400; I have reservations about using multiple-wavelength-long Beverages. First, the loss in the antenna limits the directivity increase as it is made longer. That won't hurt much, but what it does mean i; /archives//html/Topband/2000-10/msg00085.html (9,519 bytes)

Current List: 361 - 380
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]