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21. TopBand: Re: Rx amps/noiseless feedback (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 6 Oct 1997 22:39:19 +0000; Here's some measured data Eric. At the quietest location I have ever operated from, where a 1 wl Beverage was over a mile from the nearest power line and during the middle of the winter day (the quie; /archives//html/Topband/1997-10/msg00077.html (9,477 bytes)
22. TopBand: RE: loops and preamps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 7 Oct 1997 08:23:21 +0000; Hi Peter, How do you avoid unwanted common mode excitation of the push-pull follower? High input Z amps, especially those with ground referenced supply and signal leads (generally the case with tubes; /archives//html/Topband/1997-10/msg00085.html (8,050 bytes)
23. TopBand: folded unipoles (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 8 Oct 1997 09:02:07 +0000; Hi Peter, If your hypothetical antenna is 10 ohms j0 compared to 100 ohms j0, the matching inductance required in a conventional L network on 160 is 1.77 uH for a ten ohm antenna, and 4.42 uH for a; /archives//html/Topband/1997-10/msg00108.html (12,508 bytes)
24. TopBand: RE: loops and preamps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 8 Oct 1997 20:01:06 +0000; The shield is unnecessary anyway, if the antenna is properly coupled to the amplifier. It's a "wives tale" that noise is electric field dominant, and an even bigger "wive's tale" that the shield sto; /archives//html/Topband/1997-10/msg00124.html (9,388 bytes)
25. TopBand: Folded unipoles (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 8 Oct 1997 20:01:07 +0000; To: <topband@contesting.com> Hi Carl, Please excuse me for the long post, but the good point is this is the last one from me on this topic since it is much too time consuming. Correct. It was an exa; /archives//html/Topband/1997-10/msg00125.html (14,035 bytes)
26. TopBand: polarisation (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 9 Oct 1997 09:03:00 +0000; Hi Peter, With an antenna near ground, vertical.....but then so are the desired signals unless they are from a high angle. With an antenna a large fraction of a wavelength above ground, anything goe; /archives//html/Topband/1997-10/msg00138.html (10,362 bytes)
27. TopBand: RE: loops and preamps (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 10 Oct 1997 09:41:29 +0000; Let me answer that question with another question. Why would the pattern change directions when the shield and the internal wires are all in the same plane? Do you think a one turn loop loop has a d; /archives//html/Topband/1997-10/msg00154.html (9,444 bytes)
28. TopBand: Beverage feed line routing (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 10 Oct 1997 09:41:29 +0000; Frank's post was excellent, and a very accurate description of a problem commonly occurring with ANY receiving antenna...not just Beverages. Why install a low noise antenna far away from the noisy h; /archives//html/Topband/1997-10/msg00155.html (9,310 bytes)
29. TopBand: Toroids For Ununs (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 16 Oct 1997 09:49:02 +0000; To: <topband@contesting.com> It can also be a problem with 1:1 SWR's in coaxial lines, it's a problem of using the WRONG ferrite core. Saturation is almost never the problem, the problem is usually; /archives//html/Topband/1997-10/msg00220.html (8,983 bytes)
30. TopBand: inverted-L versus dipole (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 20 Oct 1997 09:34:40 +0000; W2EQS / 9 W9NFC (Charlie SK) worked DXCC with a low dipole, but he was usually five S units weaker than me (he was in Indiana, I was in Toledo). Here in Georgia with rocky clay (4 mS/m) my vertical; /archives//html/Topband/1997-10/msg00275.html (8,320 bytes)
31. TopBand: Re: Noise nulling (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 20 Oct 1997 09:41:23 +0000; I never have seen an ANC-4, but I have used self-designed devices like that here for many years. Speaking in general terms, I use mine daily. About 50% of the time it makes a noticeable improvement; /archives//html/Topband/1997-10/msg00276.html (10,481 bytes)
32. TopBand: Re: Sloped Beverage Terminations (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Tue, 21 Oct 1997 09:32:38 +0000; To: <topband@contesting.com> Hi Frank, I have in Sylvania, Ohio. I had two reasons for doing this. A high tension line about one mile from my NE and NW Beverage. I was also trying to maximize F/S ra; /archives//html/Topband/1997-10/msg00307.html (11,776 bytes)
33. TopBand: Re: [TowerTalk] Phased Staggered Beverages (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 22 Oct 1997 10:50:00 +0000; Hi Bill, That's a nice way to get additional F/B ratio. It is simple to use echelon arrangements with antennas that have low mutual coupling (coupling from antenna to antenna). It would work with lo; /archives//html/Topband/1997-10/msg00342.html (9,131 bytes)
34. TopBand: No CW Extras (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 22 Oct 1997 10:50:00 +0000; At least he knows SOME CW. Several extra class hams on 160 don't know even their first dits or dah. One has a "medical waver", even though he plays in a band. Another has perfect hearing, but got a; /archives//html/Topband/1997-10/msg00343.html (7,207 bytes)
35. TopBand: ZL7AA "clueless" (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 27 Oct 1997 10:46:00 +0000; Same here. Perhaps someone could suggest to them they take an "occasional" listen for other directions, perhaps devoting 15 minutes to one area and 15 minutes to another might be better than devotin; /archives//html/Topband/1997-10/msg00413.html (8,004 bytes)
36. TopBand: Re: EWE Info (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 27 Oct 1997 10:45:59 +0000; Hi Carl, These programs are wonderful for antennas or radials some distance above earth, but don't expect accuracy with any model when the antenna is near something as non-homogeneous as earth. For e; /archives//html/Topband/1997-10/msg00414.html (8,356 bytes)
37. TopBand: ANC-4 Test (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 27 Oct 1997 13:34:47 +0000; I just measured an ANC-4. On 160 meters, the loss through the main antenna port was 5.38 dB. That port appeared to be passive, and had good IMD performance. (In comparison the DeMaw unit I have has 5; /archives//html/Topband/1997-10/msg00417.html (7,824 bytes)
38. TopBand: Not hearing, one way propagation. (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Fri, 31 Oct 1997 09:09:38 +0000; Remember the noise level and QRM at the other end means an awful lot on low bands. Below the MUF, the signals are always there. The only reason we usually don't hear them is they are buried in noise; /archives//html/Topband/1997-10/msg00472.html (8,141 bytes)
39. TopBand: Sloper Array and Baluns (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Wed, 3 Sep 1997 09:29:31 +0000; To: <topband@contesting.com> Hi Ralph, If the shield of the coax is connected to the tower, a choke balun on the tower would do almost nothing at all. 73, Tom W8JI -- FAQ on WWW: http://www.contesti; /archives//html/Topband/1997-09/msg00033.html (7,219 bytes)
40. TopBand: Re: [Antennas] Balun for 160 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:08 +0000; Howq did you measure resonance Angel? Changes in SWR with power level indicate one of three things. A poorly working SWR meter. An arc someplace or a connection or component breaking down. A rig tha; /archives//html/Topband/1997-09/msg00070.html (7,472 bytes)

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