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Total 34 documents matching your query.

21. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 13:44:18 -0500; If dropping the input relay causes a problem, you have the wrong input relay. Probably half of the exciters in use today hot switch the relays in PA's. It's time to spend an extra couple dollars on; /archives//html/Amps/2000-10/msg00686.html (10,332 bytes)
22. [AMPS] High-SWR protection (score: 1): Author: bknox@rfapps.com (Bruce R. Knox); Date: Mon, 30 Oct 2000 15:07:38 -0500; Hi All: Our Website is NOT intended to offer a complete treatise on station and amplifier design. There are lots of places (like this one, for sure!) to go to get all kinds of different information o; /archives//html/Amps/2000-10/msg00687.html (12,484 bytes)
23. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 17:49:31 -0500; Pull in time is about 10 mS. This is typical of amps that don't use vacuum relays....like the TL-922, Heathkits, Drakes, Dentrons, etc. The relay is sequenced, if it wasn't the 756PRO would eat band; /archives//html/Amps/2000-10/msg00689.html (10,648 bytes)
24. [AMPS] High-SWR protection (score: 1): Author: bknox@rfapps.com (Bruce R. Knox); Date: Mon, 30 Oct 2000 20:20:55 -0500; Tom: Are there two relays in the AL-1200? I guess that was my real question. It acts like there is one relay (DPDT format) and I get my alarm when it is between connecting the input and output togeth; /archives//html/Amps/2000-10/msg00691.html (11,311 bytes)
25. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 30 Oct 2000 21:55:51 -0500; The older 1200 has a standard open frame relay, which is what I prefer. The contacts are sequenced by slightly bending the output stationary NO contact up slightly towards the armature. That simple; /archives//html/Amps/2000-10/msg00694.html (9,978 bytes)
26. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 30 Oct 2000 19:06:10 -0800; "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?" That is not the problem. Let me quote my Ten-Tec manual. "ALC s; /archives//html/Amps/2000-10/msg00695.html (10,286 bytes)
27. [AMPS] High-SWR protection (score: 1): Author: 2@vc.net (measures); Date: Mon, 30 Oct 2000 19:28:51 -0800; The TL-922 relay is closer to 20mS. One relay, sequenced -- [guffaw]. ..... - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@c; /archives//html/Amps/2000-10/msg00696.html (8,413 bytes)
28. [AMPS] High-SWR protection (score: 1): Author: 2@vc.net (measures); Date: Mon, 30 Oct 2000 20:02:22 -0800; This is Your problem. On my transceiver, the directional coupler for the swr protection circuit is outside the transmitter. I have never heard of a solid state radio that was not constructed in such; /archives//html/Amps/2000-10/msg00697.html (8,277 bytes)
29. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 31 Oct 2000 07:53:20 -0500; OK up until here Colin: That's an old and very incorrect wive's tale. Incorrect rumor has it that a 25 ohm load and 25 ohm R will look like 50 ohms and have a 1:1 false SWR reading, or that a 50 ohm; /archives//html/Amps/2000-10/msg00702.html (10,573 bytes)
30. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Lamb); Date: Tue, 31 Oct 2000 05:42:27 -0800; "That's an old and very incorrect wive's tale. Incorrect rumor has it that a 25 ohm load and 25 ohm R will look like 50 ohms and have a 1:1 false SWR reading, or that a 50 ohm impedance (which is not; /archives//html/Amps/2000-10/msg00705.html (9,463 bytes)
31. [AMPS] High-SWR protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Tue, 31 Oct 2000 14:32:31 +0000; Hello Colin and all on the reflector, I would like to know what a directional coupler would indicate if there was reactance and resistance on the load for example 35R with -35J . The vector sum is 50; /archives//html/Amps/2000-10/msg00706.html (8,721 bytes)
32. [AMPS] High-SWR protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Tue, 31 Oct 2000 12:12:45 -0500; The VSWR is determined by the (complex) load impedance Zl and the characteristic impedance of the transmission line Zo (which I'll take to be resistive and equal to 50 ohms) as follows. Here, Gamma i; /archives//html/Amps/2000-10/msg00708.html (10,198 bytes)
33. [AMPS] High-SWR protection (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Tue, 31 Oct 2000 09:20:00 -0800; Hi Steve: Regarding your question of 35 -j35, I come up with an swr of about 2.25, using the Smith Chart. K7FM -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Admin; /archives//html/Amps/2000-10/msg00709.html (8,793 bytes)
34. [AMPS] High-SWR protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 31 Oct 2000 17:40:40 -0500; Nice remark Colin! 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 re; /archives//html/Amps/2000-10/msg00711.html (9,340 bytes)

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