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21. Re: [TenTec] OT 75 Ohm twin feeder (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Wed, 11 Jun 2008 21:15:04 +0800; I have been told that some of the better quality speaker wires make excellent twin wire. Don't know which one though. I believe the cobweb is using standard twin speaker cable. 73, Marinus, ZL2ML ___; /archives//html/TenTec/2008-06/msg00226.html (7,630 bytes)
22. [TenTec] OT: Sigma 40XK (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Sun, 15 Jun 2008 13:02:02 +0800; I am getting interested in this antenna but most stuff I read about is on DXpeditions and beach fronts. Anyone has any opinions on using this inland? Thanks, Marinus, ZL2ML __________________________; /archives//html/TenTec/2008-06/msg00311.html (7,307 bytes)
23. [TenTec] TenTec 228 ATU (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Tue, 24 Jun 2008 15:35:52 +0800; Just bought a 228 ATU. Front is immaculate, bottom and top have some scratches but a paintjob will take care of that. The SO239 sockets are well used so those are replaced with N-sockets in line with; /archives//html/TenTec/2008-06/msg00408.html (8,906 bytes)
24. Re: [TenTec] TenTec 228 ATU (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Fri, 27 Jun 2008 15:19:50 +0800; Earlier I invited on the list input in a proposed change to the TT 228 ATU. I was considering placing an impedance transformer at the output of the transmatch in an effort to lower the losses when ma; /archives//html/TenTec/2008-06/msg00472.html (8,866 bytes)
25. Re: [TenTec] TenTec 228 ATU (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Sat, 28 Jun 2008 12:31:59 +0800; In the Tentec 228 ATU the toroid is encased in plastic and hte windings are silverplated copper. The plastic is sued to keep the windings from touching each other and then there is just a wiper conn; /archives//html/TenTec/2008-06/msg00484.html (11,047 bytes)
26. Re: [TenTec] TenTec 228 ATU - update (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Sat, 28 Jun 2008 18:30:28 +0800; Found a construction description of a 1:9 unun with a FT114-61 toroid that spans several bands. Will try this setup with a low pass L-C matching network since it will have very low losses. Don't know; /archives//html/TenTec/2008-06/msg00485.html (7,784 bytes)
27. Re: [TenTec] OT: Toroid ratings / selection (was TenTec 228 ATU) (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Sun, 29 Jun 2008 08:49:26 +0800; The TenTec 228 ATU was sold as a 200 Watt ATU. If matching 50 Ohm coax to 50 Ohm coax (I think this is called conjugated match) without a reactance with the components then the loss is around the 25; /archives//html/TenTec/2008-06/msg00493.html (12,135 bytes)
28. Re: [TenTec] OT SWR VS Power Loss (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 7 Jul 2008 02:14:57 +0800; There is a major difference if you are using a short antenna with low radiation impedance. 90 % or more of the output can get lost in the coax when it is in that situation longer than a couple of fee; /archives//html/TenTec/2008-07/msg00082.html (7,725 bytes)
29. Re: [TenTec] OT SWR VS Power Loss (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 7 Jul 2008 09:32:58 +0800; One item I forgot to mention is that if your SWR is not 1:1 on the coax then the coax is not matched which results in the coax starting to radiate RF and picking up RF. The latter can dramatically in; /archives//html/TenTec/2008-07/msg00093.html (9,401 bytes)
30. [TenTec] Omni 546C driver biasing (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 7 Jul 2008 11:14:57 +0800; Finally after a long wait new finals arrived: MRF 454 (Macom) replacing blown MRF 458. I already had received new drivers, the MRF 476 (RFG). When I was measuring what was wrong I measured a driver b; /archives//html/TenTec/2008-07/msg00098.html (8,681 bytes)
31. [TenTec] OT: SWR & Coax (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 7 Jul 2008 15:39:13 +0800; When Coax is terminated at the transmitter end and the far end with an impedance that is equal to its defined impedance we will have a SWR of 1:1. Only when the currents on inner conductor and on shi; /archives//html/TenTec/2008-07/msg00103.html (7,530 bytes)
32. [TenTec] OT: Selection of ferrite material (was SWR and Coax) (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 7 Jul 2008 18:18:38 +0800; First of all thanks to all about rectifying my misconception on SWR and radiating coax. My rig is working again but not much to work tonight on 7 Mhz so am up to some more internet investigations. (m; /archives//html/TenTec/2008-07/msg00109.html (7,863 bytes)
33. [TenTec] Bliss: Omni 546C working FB again (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Wed, 9 Jul 2008 12:26:37 +0800; Finally got the Omni 546-C working like it would have when it came out of the factory. Replaced the new drivers (that had trouble getting a low bias) with the ones I took out and bias adjusted FB. Th; /archives//html/TenTec/2008-07/msg00200.html (9,358 bytes)
34. Re: [TenTec] CW weighting (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 14 Jul 2008 06:17:57 +0800; What a lot of folks do not realise is that with modern DSP processing the CW get's "muddled" and characters get shortened. This is especially noticeable if you are using an external DSP processor, th; /archives//html/TenTec/2008-07/msg00287.html (7,415 bytes)
35. Re: [TenTec] OT Antenna Tuners (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Sun, 20 Jul 2008 08:35:18 +0800; If I may just throw my humble opinion / experiences in here. I use less that 100 Watts so it may not apply to some of the big gun setups. For a balanced feed I prefer very much the S-Match from PA0FR; /archives//html/TenTec/2008-07/msg00332.html (9,978 bytes)
36. Re: [TenTec] OT Antenna Tuners (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Tue, 22 Jul 2008 14:48:32 +0800; I have not been following the thread closely. However I disagree with the statement that the input unun is "just" a transformer. It is important that is understood that this is an unun where there is; /archives//html/TenTec/2008-07/msg00343.html (9,489 bytes)
37. Re: [TenTec] OT Antenna Tuners (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Thu, 24 Jul 2008 03:56:34 +0800; Thank you for correcting the misunderstandings and the information on the toroid material. 73, Marinus, ZL2ML - when I did the replacement of all the byspass capacitors certain boards did not need to; /archives//html/TenTec/2008-07/msg00349.html (10,021 bytes)
38. Re: [TenTec] OT Static Discharge (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Thu, 24 Jul 2008 12:02:38 +0800; You'll find that just unplugging the antenna's is only partly protective. Sometimes ligning just appears out of the blue, in any case you may not have heard the first few lightnings until it is close; /archives//html/TenTec/2008-07/msg00354.html (8,259 bytes)
39. Re: [TenTec] OT Antenna Tuners (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Fri, 25 Jul 2008 18:14:02 +0800; The TenTec design is OK but it would requrie an extra switch and if really getting down to the nitty gritty it is no longer a pure L-match. There was an article in the ARRL Antenna compendium vol 3 t; /archives//html/TenTec/2008-07/msg00360.html (9,640 bytes)
40. [TenTec] pilot light bulbs (score: 1): Author: Marinus Loewensteijn <zl2ml@hotmail.com>; Date: Mon, 4 Aug 2008 06:17:07 +0800; I am looking at replacing the light sin the 228 ATU, 280 Power Supply and the Omni 546-C with LED equivalents. I see that the follwing firm supplies these in individual lots: http://www.superbrightle; /archives//html/TenTec/2008-08/msg00030.html (8,197 bytes)

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