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1. [AMPS] SWR Protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Fri, 01 Dec 2000 17:03:09 +0000; Talking about more interesting aspects of amps, I was wondering if anyone knows of a single chip microprocessor or pic that has 4 or 8 A/D converters in the chip that can monitor 4 input simultaneous; /archives//html/Amps/2000-12/msg00012.html (7,879 bytes)
2. [AMPS] SWR Protection (score: 1): Author: DAVED@ctilidar.com (Dave D'Epagnier); Date: Fri, 1 Dec 2000 10:17:12 -0700; This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --_=_NextPart_001_01C05BBA.8D9E1680 Content-Type: text/plain St; /archives//html/Amps/2000-12/msg00013.html (15,580 bytes)
3. [AMPS] SWR Protection (score: 1): Author: bknox@rfapps.com (Bruce R. Knox); Date: Fri, 1 Dec 2000 12:27:44 -0500; Absolutely agreed, Dave. For microprocessor coding using integers, there is an easier algorithm that leaves out the square root (and makes it compute WAY faster): ((Forward A/D + Reflected A/D) * 100; /archives//html/Amps/2000-12/msg00014.html (10,568 bytes)
4. [AMPS] SWR Protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Fri, 01 Dec 2000 17:48:43 +0000; --A83EFF629AA0D3C2F56BAE2E Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Thanks for the response Dave. The primary reason is to shut down the amp as fast as possible and; /archives//html/Amps/2000-12/msg00016.html (17,672 bytes)
5. [AMPS] SWR Protection (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Fri, 1 Dec 2000 13:07:05 -0500; SWR varies extremely rapidly when something in the transmission-line-antenna system arcs over. In a high-power radar that I once used, "SWR" sensing was able to shut off the PA within one microsecond; /archives//html/Amps/2000-12/msg00017.html (8,615 bytes)
6. [AMPS] SWR Protection (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Fri, 01 Dec 2000 14:58:34 EST; Hi Steve, The Microchip PIC 16C7X series approaches that requirement. They can do 8 bit A/D conversions in 2 uS, which should be sufficiently close to simultaneous for a SWR meter application. 73, Ma; /archives//html/Amps/2000-12/msg00019.html (8,793 bytes)
7. [AMPS] SWR Protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Fri, 01 Dec 2000 20:08:14 +0000; Hi Bruce, like you say with a high swr the forward power increases along with the reflected power so the easiest and quickest way to shut down the amp is to monitor the forward power output and trigg; /archives//html/Amps/2000-12/msg00021.html (12,604 bytes)
8. [AMPS] SWR Protection (score: 1): Author: w7ti@jps.net (Bill Turner); Date: Fri, 01 Dec 2000 12:55:25 -0800; ____________________________________________________________ Not a good idea. For example, consider an open connection in the coax. Voltage goes up, current goes to zero, output power goes to zero (w; /archives//html/Amps/2000-12/msg00023.html (8,607 bytes)
9. [AMPS] SWR Protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Fri, 01 Dec 2000 22:31:15 +0000; Hi Bill, every time I transmitted into the wrong antenna the forward power on the meter goes higher and the reflected power does the same. I plan to calculate the swr and shut down the amp with a hig; /archives//html/Amps/2000-12/msg00028.html (9,614 bytes)
10. [AMPS] SWR Protection (score: 1): Author: w7ti@jps.net (Bill Turner); Date: Fri, 01 Dec 2000 19:43:21 -0800; ____________________________________________________________ Ok, then your meter isn't really measuring power. It's measuring voltage while ASSUMING a fixed resistance of 50 ohms, therefore displayin; /archives//html/Amps/2000-12/msg00031.html (9,274 bytes)
11. [AMPS] SWR Protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Sat, 02 Dec 2000 04:50:22 +0000; Bill I don't know this for sure but what I have read in the hand books is that when you have a high swr on the line to the antenna the forward power is reflected back from the load and is added to th; /archives//html/Amps/2000-12/msg00033.html (10,425 bytes)
12. [AMPS] SWR Protection (score: 1): Author: w7ti@jps.net (Bill Turner); Date: Fri, 01 Dec 2000 21:29:25 -0800; _____________________________________________________ With an open or shorted piece of coax, there will be forward and reflected voltage and current, but relatively little power, since the impedance; /archives//html/Amps/2000-12/msg00035.html (9,280 bytes)
13. [AMPS] SWR Protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 3 Dec 2000 20:34:07 -0500; Hi Bill, RF power meters traditionally measure voltage across the line and current through the line. Current and voltage are both expressed as a voltage from a low impedance source. The current is r; /archives//html/Amps/2000-12/msg00044.html (10,001 bytes)
14. [AMPS] SWR Protection (score: 1): Author: w7ti@jps.net (Bill Turner); Date: Sun, 03 Dec 2000 16:26:36 -0800; ______________________________________________________ This is why I suggested the gentleman use a fault detector which monitors both RF voltage and current separately and trips when either one excee; /archives//html/Amps/2000-12/msg00046.html (9,247 bytes)
15. [AMPS] SWR Protection (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 3 Dec 2000 20:55:14 -0500; What fault condition can do that Bill? I certainly can't think of one! On the other hand I can think of conditions where SWR is very high and voltage and current look perfectly OK when taken as scal; /archives//html/Amps/2000-12/msg00047.html (9,288 bytes)
16. [AMPS] SWR Protection (score: 1): Author: ve3tu@rac.ca (Steve); Date: Mon, 04 Dec 2000 03:14:47 +0000; If anyone is interested visit this site http://www.ibelings.com/n4ip/sskw/ It describes the problem of using a microprocessor with a single ad converter to calculate swr. The 30 usec delay between re; /archives//html/Amps/2000-12/msg00048.html (9,289 bytes)
17. [AMPS] SWR Protection (score: 1): Author: w7ti@jps.net (Bill Turner); Date: Sun, 03 Dec 2000 19:38:35 -0800; ___________________________________________________________ An antenna or coax fault which causes the monitored voltage to rise and the current to fall, which would make the "apparent" power the sam; /archives//html/Amps/2000-12/msg00049.html (9,772 bytes)
18. [AMPS] SWR Protection (score: 1): Author: w7ti@jps.net (Bill Turner); Date: Sun, 03 Dec 2000 19:49:35 -0800; ________________________________________________________ Don't feel bad Steve - it's what we do best! :-) 73, Bill W7TI -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.; /archives//html/Amps/2000-12/msg00051.html (8,719 bytes)
19. [AMPS] SWR Protection (score: 1): Author: bknox@rfapps.com (Bruce R. Knox); Date: Sun, 3 Dec 2000 23:23:09 -0500; Steve: Without reading that site in complete detail, I believe he's saying that he used a MAX-186 12 channel a/d converter connected to a Basic Stamp. This is an 8 channel multiplexed a/d converter.; /archives//html/Amps/2000-12/msg00052.html (11,045 bytes)
20. [AMPS] SWR Protection (score: 1): Author: bknox@rfapps.com (Bruce R. Knox); Date: Mon, 4 Dec 2000 00:03:50 -0500; Oops... 8 channel a/d!!!! Not 12!!!! It's also a 12 bit unit - way more than you need! Bruce Steve: Without reading that site in complete detail, I believe he's saying that he used a MAX-186 12 chann; /archives//html/Amps/2000-12/msg00053.html (11,622 bytes)

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