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Total 34 documents matching your query.

1. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 31 Oct 2000 18:00:52 -0800; "I'm not "anxious to criticize", the statement in the Ten Tec manual is simply incorrect. Reactance causes reflected voltage to appear in the directional coupler just as much as resistance errors do.; /archives//html/Amps/2000-10/msg00005.html (11,377 bytes)
2. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 31 Oct 2000 21:29:32 -0500; Maybe it's just poor wording, but they didn't say it doesn't indicate the amount of reactance. They said it gives "no indication of reactance". That is untrue, a properly working directional coupler; /archives//html/Amps/2000-10/msg00006.html (10,882 bytes)
3. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 13:12:02 -0500; A few days ago in one of my all-too-frequent mental lapses, I tried to put 200 W of CW RF power into a coax switch while it was set to short the line. There was a nasty, rich, fat, juicy sounding arc; /archives//html/Amps/2000-10/msg00653.html (8,533 bytes)
4. [AMPS] High-SWR protection (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 29 Oct 2000 14:02:09 -0500; The RF Applications VFD wattmeter, though not inexpensive itself, has an inexpensive option for unkeying the amplifier as soon as it senses SWR above an adjustable limit. The company also makes (or a; /archives//html/Amps/2000-10/msg00659.html (9,499 bytes)
5. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 29 Oct 2000 14:35:49 -0800; Hi Chuck: One of the problems with many of the swr protection circuits is that when there is a direct short the measured reflected power may be zero - simply because there is no voltage present becau; /archives//html/Amps/2000-10/msg00661.html (8,316 bytes)
6. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 29 Oct 2000 20:02:55 -0500; I've never seen an SWR shutdown system (directional coupler) that measures only voltage, and reads zero when the output is shorted. What rig uses one? 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW:; /archives//html/Amps/2000-10/msg00663.html (8,153 bytes)
7. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 29 Oct 2000 18:04:14 -0800; The rig in question was an Drake TR-5. The rig failed. The coax was found shorted. I replaced the finals and checked the foldback circuit. It worked properly. Not too much later, I repaired an Atlas; /archives//html/Amps/2000-10/msg00664.html (8,419 bytes)
8. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 29 Oct 2000 21:19:40 -0500; I can't think of any way to build a directional coupler that won't show high SWR when the load is shorted. Can anyone think of a way? 73, Tom W8JI w8ji@contesting.com -- FAQ on WWW: http://www.conte; /archives//html/Amps/2000-10/msg00665.html (8,406 bytes)
9. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 21:35:55 -0500; I asked: Thanks to the many who responded, many directly to me, off-list. The winning combination, IMO, is to 1. buy an RF Applications, Inc., VFD Series, directional, peak, wattmeter <http://radioda; /archives//html/Amps/2000-10/msg00666.html (9,379 bytes)
10. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 21:55:02 -0500; Not any _correct_ way. If the load is a short, then the reflected power equals the forward power; the voltage reflection coefficient (Gamma) is minus one; and the current reflection coefficient is pl; /archives//html/Amps/2000-10/msg00667.html (8,654 bytes)
11. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Sun, 29 Oct 2000 22:13:21 -0500; At <http://www.radiodan.com/rfapps/vfd.htm> it is stated that the 5-kW version of the VFD is new. I'm sorry to hear this. All I can say is that I also have two Bird wattmeters and an assortment of sl; /archives//html/Amps/2000-10/msg00668.html (9,821 bytes)
12. [AMPS] High-SWR protection (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 29 Oct 2000 23:02:35 -0600; I must have misread the original problem. I thought that the coax between the exciter and the amp shorted. In this case, the VFD or other type alarm relay must be inserted at the output of the EXCIT; /archives//html/Amps/2000-10/msg00670.html (10,228 bytes)
13. [AMPS] High-SWR protection (score: 1): Author: 2@vc.net (measures); Date: Sun, 29 Oct 2000 21:30:30 -0800; fabricate end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting; /archives//html/Amps/2000-10/msg00671.html (8,846 bytes)
14. [AMPS] High-SWR protection (score: 1): Author: 2@vc.net (measures); Date: Sun, 29 Oct 2000 21:30:29 -0800; Bingo. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Pr; /archives//html/Amps/2000-10/msg00672.html (8,884 bytes)
15. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 06:59:05 -0500; If the relays in the amp are properly sequenced, dropping the relay line won't hurt a thing. If they are NOT properly sequenced, you had best fix them so they are. Otherwise you are leaving yourself; /archives//html/Amps/2000-10/msg00674.html (9,512 bytes)
16. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 06:59:05 -0500; A Bird meter is + or - 5% of full scale anywhere on the scale, when calibrated within factory specs. With that in mind, if you are using a 2500 watt slug to read 1500 watts the actual power can be 1; /archives//html/Amps/2000-10/msg00675.html (9,559 bytes)
17. [AMPS] High-SWR protection (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 30 Oct 2000 07:29:22 -0800; By 'properly sequenced' I presume you mean that the output relay closes before the input relay and opens after it. But even in this case, dropping the amp relay line hot-switches the input relay. I a; /archives//html/Amps/2000-10/msg00677.html (10,120 bytes)
18. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Mon, 30 Oct 2000 10:43:49 -0500; That sounds right. Thanks. Sorry -- I was guilty of mindlessly parroting the advice on RFApplications' website. Perhaps someone from RFApplications will chime in to enlighten us? Sensible advice. Tha; /archives//html/Amps/2000-10/msg00679.html (9,558 bytes)
19. [AMPS] High-SWR protection (score: 1): Author: 2@vc.net (measures); Date: Mon, 30 Oct 2000 09:16:49 -0800; ? Good point, Vic. - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@conte; /archives//html/Amps/2000-10/msg00682.html (8,926 bytes)
20. [AMPS] High-SWR protection (score: 1): Author: 2@vc.net (measures); Date: Mon, 30 Oct 2000 09:16:47 -0800; Also, if the termination is not 50 +/- j0 ohms, all bets are off. Before placing faith in any any power measurement, measure the DC resistance of the termination with a DMM. end - Rich..., 805.386.3; /archives//html/Amps/2000-10/msg00683.html (9,422 bytes)

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