|
On Wed, 4 May 2005 16:13:10 -0700, "John Smith"
wrote: And, that current source works, I have used it many times (makes an excellent test lamp for 5-30V)... will with stand at least 30V+ across drain and source and maintain ~10ma... when the REV current to its' led drops to zero, max flows though the FWD--all other cases they must share that 10ma... Hi Brett, I've no doubt, but in your circuits - never. Doesn't make sense unless you need parts ballast. It's like when the watchmakers advertised watches with 60 jewels, and there were only half a dozen points that actually used them. 73's Richard Clark, KB7QHC |
Richard:
If I use that at QRP levels, then go to QRO, that constant current source will be used! I have a couple of burnt leds which offer proof... at a KW the fet would wave bye-bye (even before I suspect)... Regards, John "Richard Clark" wrote in message ... | On Wed, 4 May 2005 16:13:10 -0700, "John Smith" | wrote: | | And, that current source works, I have used it many times (makes an | excellent test lamp for 5-30V)... will with stand at least 30V+ across drain | and source and maintain ~10ma... when the REV current to its' led drops to | zero, max flows though the FWD--all other cases they must share that 10ma... | | Hi Brett, | | I've no doubt, but in your circuits - never. Doesn't make sense | unless you need parts ballast. It's like when the watchmakers | advertised watches with 60 jewels, and there were only half a dozen | points that actually used them. | | 73's | Richard Clark, KB7QHC |
If you would send it to me, I will post it on my website so all may
peruse... "John Smith" wrote in message ... Oh great!!! Can I just rename it? What is a workaround? Or, do I have to get a free host and setup a webpage? Regards, John "Cecil Moore" wrote in message ... | John Smith wrote: | Hopefully, the attachment of the .jpg was successful.... | | The usenet gods will not allow .jpg files since this is | specified as a text only newsgroup. | -- | 73, Cecil http://www.qsl.net/w5dxp | | ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- | http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups | ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Cecil Moore wrote:
John Smith wrote: Well, that is how my "meter SWR" which I constructed looks all right--but I wished to get away having to construct a directional coupler from tubing and pickup loops... Only, my (metered) SWR meter uses just ONE pickup loop, I switch terminating 50 ohm resisistor and take-off ends and use the single loop for BOTH "FWD" and "REF", with a physical switch--my thinking was it would keep the device more "balanced" using the same pickup... A toroidal pickup samples the current at one point. Knowing the current at one point tells you absolutely nothing about SWR. Hi, Cecil - I think he thinks his toroid is a directional coupler. John |
Richard:
I just climbed up and pulled the SWR meter off the pole--DUH!!! Those 50 ohm resistors are actually 1500 ohm 2 watt metal oxide.... sorry, as usual, your post was relevant.... I just couldn't see it till I opened up the box.... I could have sworn I stuck 50 ohm ones in there--getting old here... but now I can see it, if they had been 50 ohm, power to the ant would have been really limited.... and I would have "smoked" that winding and resistors... Anyway, will try to get sometime to toy with it tomorrow, and paste the "real" schematic of it on the webpage.... Warmest regards, John "Richard Clark" wrote in message ... | On Wed, 4 May 2005 16:13:10 -0700, "John Smith" | wrote: | | And, that current source works, I have used it many times (makes an | excellent test lamp for 5-30V)... will with stand at least 30V+ across drain | and source and maintain ~10ma... when the REV current to its' led drops to | zero, max flows though the FWD--all other cases they must share that 10ma... | | Hi Brett, | | I've no doubt, but in your circuits - never. Doesn't make sense | unless you need parts ballast. It's like when the watchmakers | advertised watches with 60 jewels, and there were only half a dozen | points that actually used them. | | 73's | Richard Clark, KB7QHC |
Cecil, W5DXP wrote:
"Knowing the current at one point tells you absolutely bothing about SWR." The reflection coefficient depends on a mismatched load at the end of the line. Reflection coefficient is more or less constant in a low loss transmission line. Bird`s Model 43 does not contain a toroid, but it does sample the current at a single spot. Just as its forward and reverse watt indications can be scaled to SWR readings, it could be calibrated to indicate SWR and scaled to give watts. Forward and reverse power flows on a line are nearly constant, except for slight line loss, no matter where the line is sampled. The design trick in the Model 43 is making samples derived from amps and volts exactly equat to each other. So, when their polarity is the same, their total is double the value of either by itself. When their polarities are reversed from each other, they cancel completely. It so happens that a reflected wave always undergoes a reversal of polarity of either its volts or amps, but never both. This is the distinguishing difference between the forward wave and the reflected wave. The phase reversal of the reflected wave, makes its sample of volts and amps in the 43`s directional coupler (sampling unit) cancel, while the sample of the forward wave has double the magnitude of either sample, volts or amps, by itself. This permits a reading proportional to forward power only. To get an indication of the reflected power alone, it is necessary ro flip a switch (in the Model 43, this is reversal of the slug`s direction). This switch reverses polarity so that now the forward power samples cancel and the reverse (reflected) power samples produce a double of either of their values alone. Bird gets very satisfactory results without a toroid. Using only a small pickup loop inside the sampling element to sample the line current is enough. Line voltage is sampled by this tiny coil`s capacitive coupling to the precission short 50-ohm line segment inside the meter case. In normal low-loss transmission lines the forward power is the same at either end of the line. Same for reflected power. So it makes no difference where they are measured in the transmission line. Best regards, Richard Harrison, KB5WZI |
John - KD5YI wrote:
Cecil Moore wrote: A toroidal pickup samples the current at one point. Knowing the current at one point tells you absolutely nothing about SWR. I think he thinks his toroid is a directional coupler. But it is a current transducer, not a directional coupler. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Richard Harrison wrote:
Cecil, W5DXP wrote: "Knowing the current at one point tells you absolutely nothing about SWR." Bird`s Model 43 does not contain a toroid, but it does sample the current at a single spot. It also samples a voltage which John's design does not. I left out a word that I thought was implied. I should have said: Knowing *only* the current at one point tells you absolutely nothing about SWR. He is sampling *only* the current and *only* at one point. Either two current samples, a current and voltage sample, or two voltage samples are required for an SWR reading. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
"John Smith" wrote in message ... Well, can't remember where I seen that "directional coupler", but will be willing to give the designer credit if he makes himself know... The led indicating circuit is my design... It seems to work, all I have is another SWR with analog meter I constructed myself to compare it with, soon as I locate someone with a commercial meter--I will compare both of mine to it... Only real apparent problem is the REF led changes brightness slowly (and here it is hard to "judge" SWR by brilliance), until right at, or near, match, when it will plunge to darkness rather quickly... Well, show me what is wrong and suggest an alternative circuit or mods to set it proper (or explain in text, I will see how good I am at word problems here)--I am all EARS Cecil... smile Regards, John "Cecil Moore" wrote in message ... | John Smith wrote: | OK, one... more.... time!!! there is no time yanno! | Please someone, see if you can view the page he | http://blake.prohosting.com/mailguy2/JS-swr.jpg | | You have a number of problems. Where did you get that design? | In order to separate the forward power from the reflected | power, you need to use phasor addition/subtraction of voltage | and current. You only have current sampled. Where is your | voltage sample? Where is your phasor addition/subtraction? | -- | 73, Cecil http://www.qsl.net/w5dxp | | | ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- | http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups | ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- I found this while tidying my bookshelf last night: CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator". 73 Roger ZR3RC |
"Richard Harrison" wrote:
Forward and reverse power flows on a line are nearly constant, except for slight line loss, no matter where the line is sampled. ____________ Average power is nearly constant, but for every value of SWR 1:1, peak power along the line is not. I have seen many examples in FM broadcast stations where their transmission line was damaged at intervals of 1/2 wavelength due to a high mismatch at the antenna, or a precipitating failure in the line itself. RF |
Richard Fry wrote:
"Richard Harrison" wrote: Forward and reverse power flows on a line are nearly constant, except for slight line loss, no matter where the line is sampled. Average power is nearly constant, but for every value of SWR 1:1, peak power along the line is not. I have seen many examples in FM broadcast stations where their transmission line was damaged at intervals of 1/2 wavelength due to a high mismatch at the antenna, or a precipitating failure in the line itself. Current maximum points are prone to overheating. Voltage maximum points are prone to arcing. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Cecil Moore wrote:
John - KD5YI wrote: Cecil Moore wrote: A toroidal pickup samples the current at one point. Knowing the current at one point tells you absolutely nothing about SWR. I think he thinks his toroid is a directional coupler. But it is a current transducer, not a directional coupler. I know. |
OK. Before I even bother building this--will it work "correctly" and give
me a basic indication of some form of SWR-V,I or P? http://blake.prohosting.com/mailguy2/JS_3.JPG Thanks all for the help, I know I am probably a pain, just gotta beat my head against that wall until something gets in!!! Warmest regards, John "John Smith" wrote in message ... | This is a SWR bridge I built using leds and a homemade "directional | coupler." | | ALL critiques on it, and ideas for improvements are welcomed!!! | | Please excuse my rough drawing, I am NOT a draftsperson! | | Hopefully, the attachment of the .jpg was successful.... | | Warmest regards, | John | | |
.... I should have indicated that the "polarity" of the coils are reversed in
direction (windings in opposite directions) in the circuit... Regards, John "John Smith" wrote in message ... | OK. Before I even bother building this--will it work "correctly" and give | me a basic indication of some form of SWR-V,I or P? | http://blake.prohosting.com/mailguy2/JS_3.JPG | | Thanks all for the help, I know I am probably a pain, just gotta beat my | head against that wall until something gets in!!! | | Warmest regards, | John | | "John Smith" wrote in message | ... || This is a SWR bridge I built using leds and a homemade "directional || coupler." || || ALL critiques on it, and ideas for improvements are welcomed!!! || || Please excuse my rough drawing, I am NOT a draftsperson! || || Hopefully, the attachment of the .jpg was successful.... || || Warmest regards, || John || || | | |
On Thu, 5 May 2005 08:43:28 -0700, "John Smith"
wrote: will it work "correctly" Hi Brett, No. For exactly the same reasons that have gotten you this far. The first symptom of insanity is repeating the same thing with an expectation of a different outcome. 73's Richard Clark, KB7QHC |
LOL... I was so hoping you would not notice... grin
Well, thanks, back to the drawing board... Warmest regards, John "Richard Clark" wrote in message ... | On Thu, 5 May 2005 08:43:28 -0700, "John Smith" | wrote: | | will it work "correctly" | | Hi Brett, | | No. | | For exactly the same reasons that have gotten you this far. | | The first symptom of insanity is repeating the same thing with an | expectation of a different outcome. | | 73's | Richard Clark, KB7QHC |
John Smith wrote:
OK. Before I even bother building this--will it work "correctly" and give me a basic indication of some form of SWR-V,I or P? http://blake.prohosting.com/mailguy2/JS_3.JPG It's more like a current sensitive version of that light bulb on the end of your whip antenna. Thanks all for the help, I know I am probably a pain, just gotta beat my head against that wall until something gets in!!! You have some of the rest of us doing that, too. By the way, who's Yanno? Is it that long haired piano player? :-) ac6xg |
John Smith wrote:
OK. Before I even bother building this--will it work "correctly" and give me a basic indication of some form of SWR-V,I or P? http://blake.prohosting.com/mailguy2/JS_3.JPG Nope, it won't work. It still has the same problem of sampling the current (and nothing else) at only one point. The two pickup coils are reading exactly the same current just with opposite phase. You still don't have any means of separating the forward component from the reflected component. Your toroid is NOT a directional coupler - it is a current transducer. -- 73, Cecil, http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
LOL!!!
Why, ya got somethin' agin' peeano players??? grin Warmest regards, John "Jim Kelley" wrote in message ... | John Smith wrote: | | OK. Before I even bother building this--will it work "correctly" and give | me a basic indication of some form of SWR-V,I or P? | http://blake.prohosting.com/mailguy2/JS_3.JPG | | It's more like a current sensitive version of that light bulb on the end | of your whip antenna. | | Thanks all for the help, I know I am probably a pain, just gotta beat my | head against that wall until something gets in!!! | | You have some of the rest of us doing that, too. | | By the way, who's Yanno? Is it that long haired piano player? :-) | | ac6xg | |
Is my insanity, improving, degrading, or maintaining status quo? grin
http://blake.prohosting.com/mailguy2/JS4.jpg Warmest regards, John "Richard Clark" wrote in message ... | On Thu, 5 May 2005 08:43:28 -0700, "John Smith" | wrote: | | will it work "correctly" | | Hi Brett, | | No. | | For exactly the same reasons that have gotten you this far. | | The first symptom of insanity is repeating the same thing with an | expectation of a different outcome. | | 73's | Richard Clark, KB7QHC |
John, from your circuit, if you change the direction of current in the
coaxial conductor through the ferrite ring, nothing happens. Why should it? The only thing worthy of consideration is your determined persistence. As I have said before, as may be gleaned from other contributors, you are in good company. Beware, the amount of effort the old wives are putting into it might give you the impression it's worth while making a patent application. On the other hand, what with the state of expertise in the Patent Office, you may possibly succeed. But you will never get rich enough to recover your legal expenses. ---- Reg, G4FGQ |
Ahhh Reg, I am NOT an "inventor", I have to work for a living (boss claims
he pays me for nothing anyway!!! grin)... darn lucky if I can get "proven" ideas to function properly but, if you think that stops me--think again!!! wishful-grin And, you don't have to warn me, from personal experience, ham swaps, ham friends, observations (not just picking on hams, name another group--they are there too!)--I realize there are a few which would attempt to patent sewer water and sell it for profit!!! (old boat anchors too...) I am quite honest, I want a "simpler" SWR meter (and, that is a problem, all the ones standing around with $$$ signs in their eyes are too busy or afraid they will give away a "million-dollar-idea" away to the newbie’s--that is NO HELP!!! Or, else "swollen egos" just get in the way... it gets tiring bowing all the time--I have NO time, no one really does grin!) I don't care if the darn thing is "accurate" or not!!! I don't care if it can tell me EXACTLY what SWR I have or not (well, being able to note a ~1:1 is VERY desirable--but just "lowest possible" is sufficient) EXCEPT to be able to indicate "better" and "worse." Having to construct "directional couplers" from coax and tubing or pc board etches just puts me off... I am trying to shave a bit of complication away--NOT to mention SIZE!... I'd even borrow Occams' old dull razor if I could!!! grin And, Cecils offering of the "two lamp" swr indicator is perfect!!! Too bad I can't think of a way to make it function, easily, for coax (and, the "lamps" are not "hardened" enough against damage--would have to use LEDS)... If I find what I am looking for, I'll know it--the most I'll ever do is build a bunch and give 'em away to my "good-ole CB buddies!" "10-4 Good-Buddy?" grin Warmest regards, John "Reg Edwards" wrote in message ... | John, from your circuit, if you change the direction of current in the | coaxial conductor through the ferrite ring, nothing happens. Why | should it? | | The only thing worthy of consideration is your determined persistence. | | As I have said before, as may be gleaned from other contributors, you | are in good company. | | Beware, the amount of effort the old wives are putting into it might | give you the impression it's worth while making a patent application. | | On the other hand, what with the state of expertise in the Patent | Office, you may possibly succeed. But you will never get rich enough | to recover your legal expenses. | ---- | Reg, G4FGQ | | |
Anyway.... even if not before, by this weekend I will be able to get away
from this dern computer! and go build "SOMETHING!!!!" Warmest regards, John "John Smith" wrote in message ... | Ahhh Reg, I am NOT an "inventor", I have to work for a living (boss claims | he pays me for nothing anyway!!! grin)... darn lucky if I can get | "proven" ideas to function properly but, if you think that stops me--think | again!!! wishful-grin | | | | And, you don't have to warn me, from personal experience, ham swaps, ham | friends, observations (not just picking on hams, name another group--they | are there too!)--I realize there are a few which would attempt to patent | sewer water and sell it for profit!!! (old boat anchors too...) | | | | I am quite honest, I want a "simpler" SWR meter (and, that is a problem, all | the ones standing around with $$$ signs in their eyes are too busy or afraid | they will give away a "million-dollar-idea" away to the newbie’s--that is NO | HELP!!! Or, else "swollen egos" just get in the way... it gets tiring | bowing all the time--I have NO time, no one really does grin!) | | | | I don't care if the darn thing is "accurate" or not!!! | | | | I don't care if it can tell me EXACTLY what SWR I have or not (well, being | able to note a ~1:1 is VERY desirable--but just "lowest possible" is | sufficient) EXCEPT to be able to indicate "better" and "worse." | | | | Having to construct "directional couplers" from coax and tubing or pc board | etches just puts me off... I am trying to shave a bit of complication | away--NOT to mention SIZE!... I'd even borrow Occams' old dull razor if I | could!!! grin | | | | And, Cecils offering of the "two lamp" swr indicator is perfect!!! Too bad | I can't think of a way to make it function, easily, for coax (and, the | "lamps" are not "hardened" enough against damage--would have to use LEDS)... | | | | If I find what I am looking for, I'll know it--the most I'll ever do is | build a bunch and give 'em away to my "good-ole CB buddies!" "10-4 | Good-Buddy?" grin | | | | Warmest regards, | | John | | | | "Reg Edwards" wrote in message | ... || John, from your circuit, if you change the direction of current in the || coaxial conductor through the ferrite ring, nothing happens. Why || should it? || || The only thing worthy of consideration is your determined persistence. || || As I have said before, as may be gleaned from other contributors, you || are in good company. || || Beware, the amount of effort the old wives are putting into it might || give you the impression it's worth while making a patent application. || || On the other hand, what with the state of expertise in the Patent || Office, you may possibly succeed. But you will never get rich enough || to recover your legal expenses. || ---- || Reg, G4FGQ || || | | |
I think anybody can post to alt.binaries.schematics.electronic .
Tam/WB2TT |
Ok. I had to go out this morning.
I stopped by a used book store, I found two circuits, using the toroid in a similar fashion to what I am working with. What I found is "THE 1989 EDITION 'ARRL HANDBOOK'." ($2 bucks, what a buy, huh?) On pgs. 34-9 and 34-10 the similar circuits exist, I have placed them at: http://blake.prohosting.com/mailguy2/swr1.jpg and http://blake.prohosting.com/mailguy2/swr2.jpg This should prove as "proof of concept" that an "indicator" using such a toroid should darn well work! ... at the very least--in the fashion I am attempting... swr1 is claimed to handle up to 150 watts, swr2 2KW! So, now we should all be on the "same page" and, even those "high priests" of ARRL should NOT be offended!!!! If anyone is greatly interested in the text of construction details/article--email me.... Warmest regards, John "John Smith" wrote in message ... | This is a SWR bridge I built using leds and a homemade "directional | coupler." | | ALL critiques on it, and ideas for improvements are welcomed!!! | | Please excuse my rough drawing, I am NOT a draftsperson! | | Hopefully, the attachment of the .jpg was successful.... | | Warmest regards, | John | | |
John Smith wrote:
http://blake.prohosting.com/mailguy2/swr1.jpg http://blake.prohosting.com/mailguy2/swr2.jpg This should prove as "proof of concept" that an "indicator" using such a toroid should darn well work! ... at the very least--in the fashion I am attempting... If you will notice, your earlier versions did not sample the voltage. These designs sample the voltage through C1 and C2. The current is sampled by T1. The voltages are phasor-added to the current to obtain signals proportional to forward power and reflected power. Those voltage sampling caps are what were missing from your earlier designs. -- 73, Cecil, http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
"Cecil Moore" wrote in message ... John Smith wrote: http://blake.prohosting.com/mailguy2/swr1.jpg http://blake.prohosting.com/mailguy2/swr2.jpg This should prove as "proof of concept" that an "indicator" using such a toroid should darn well work! ... at the very least--in the fashion I am attempting... If you will notice, your earlier versions did not sample the voltage. These designs sample the voltage through C1 and C2. The current is sampled by T1. The voltages are phasor-added to the current to obtain signals proportional to forward power and reflected power. Those voltage sampling caps are what were missing from your earlier designs. -- 73, Cecil, http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator". 73 Roger ZR3RC |
Yes, I suspect that mine is relying on "stray capacatance" and it is not
sufficient--and--that is why I experience that "plunge into darkness" of the REF LED at 1:1--and NOT a smooth adjustment and indication... (just guessing) Anyway, those capacitors are VERY small ~3pf, and as Cecil was so kind to point out to me, in an email, a twisted pair of high-pot enameled wires would, most likely, suffice--keeping with my "cheap and simple" design.... I can simply chuck another of my junkbox toroids in for the rf choke... Warmest regards, John "Roger Conroy" wrote in message ... | | "Cecil Moore" wrote in message | ... | John Smith wrote: | http://blake.prohosting.com/mailguy2/swr1.jpg | http://blake.prohosting.com/mailguy2/swr2.jpg | | This should prove as "proof of concept" that an "indicator" using such a | toroid should darn well work! ... at the very least--in the fashion I | am | attempting... | | If you will notice, your earlier versions did not sample | the voltage. These designs sample the voltage through C1 | and C2. The current is sampled by T1. The voltages are | phasor-added to the current to obtain signals proportional | to forward power and reflected power. Those voltage sampling | caps are what were missing from your earlier designs. | -- | 73, Cecil, http://www.qsl.net/w5dxp | | ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet | News==---- | http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ | Newsgroups | ----= East and West-Coast Server Farms - Total Privacy via Encryption | =---- | | CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator". | | 73 Roger ZR3RC | | |
Roger:
Isn't that a "resistive bridge" and consumes ~3/4 of the power? Or, am I looking at the right design? It just occured to me, because of your post, I didn't say "can be left inline" for my design criteria--sorry, my mistake.... But, yes, that would be good enough, thanks for pointing that circuit out to me.... my only problem, is other than a walkie-talkie, I have no rf souce of that low of power (~4 watts or less).... Warmest regards, John "Roger Conroy" wrote in message ... | | "Cecil Moore" wrote in message | ... | John Smith wrote: | http://blake.prohosting.com/mailguy2/swr1.jpg | http://blake.prohosting.com/mailguy2/swr2.jpg | | This should prove as "proof of concept" that an "indicator" using such a | toroid should darn well work! ... at the very least--in the fashion I | am | attempting... | | If you will notice, your earlier versions did not sample | the voltage. These designs sample the voltage through C1 | and C2. The current is sampled by T1. The voltages are | phasor-added to the current to obtain signals proportional | to forward power and reflected power. Those voltage sampling | caps are what were missing from your earlier designs. | -- | 73, Cecil, http://www.qsl.net/w5dxp | | ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet | News==---- | http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ | Newsgroups | ----= East and West-Coast Server Farms - Total Privacy via Encryption | =---- | | CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator". | | 73 Roger ZR3RC | | |
Yes it seems to be best suited for a quick antenna check before turning up
the juice! Sorry it doesn't meet your needs. 73 Roger "John Smith" wrote in message ... Roger: Isn't that a "resistive bridge" and consumes ~3/4 of the power? Or, am I looking at the right design? It just occured to me, because of your post, I didn't say "can be left inline" for my design criteria--sorry, my mistake.... But, yes, that would be good enough, thanks for pointing that circuit out to me.... my only problem, is other than a walkie-talkie, I have no rf souce of that low of power (~4 watts or less).... Warmest regards, John "Roger Conroy" wrote in message ... | | "Cecil Moore" wrote in message | ... | John Smith wrote: | http://blake.prohosting.com/mailguy2/swr1.jpg | http://blake.prohosting.com/mailguy2/swr2.jpg | | This should prove as "proof of concept" that an "indicator" using such a | toroid should darn well work! ... at the very least--in the fashion I | am | attempting... | | If you will notice, your earlier versions did not sample | the voltage. These designs sample the voltage through C1 | and C2. The current is sampled by T1. The voltages are | phasor-added to the current to obtain signals proportional | to forward power and reflected power. Those voltage sampling | caps are what were missing from your earlier designs. | -- | 73, Cecil, http://www.qsl.net/w5dxp | | ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet | News==---- | http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ | Newsgroups | ----= East and West-Coast Server Farms - Total Privacy via Encryption | =---- | | CQ Amateur Radio magazine October 1997 "N7VE's One LED SWR Indicator". | | 73 Roger ZR3RC | | |
Design should be completed--I expect "automatic operation" from constant
current source.... Sketched and posted for "completeness." Anyway, will build this tomorrow... http://blake.prohosting.com/mailguy2/johnsmith.jpg Thanks all for your critiques and help... Warmest regards, John "John Smith" wrote in message ... | This is a SWR bridge I built using leds and a homemade "directional | coupler." | | ALL critiques on it, and ideas for improvements are welcomed!!! | | Please excuse my rough drawing, I am NOT a draftsperson! | | Hopefully, the attachment of the .jpg was successful.... | | Warmest regards, | John | | |
.... and, the above post is a joke, since now I have used (stolen?) so much
of anothers plans... frown-but-grin-underneath John "John Smith" wrote in message ... | Design should be completed--I expect "automatic operation" from constant | current source.... | Sketched and posted for "completeness." | Anyway, will build this tomorrow... | http://blake.prohosting.com/mailguy2/johnsmith.jpg | | Thanks all for your critiques and help... | | Warmest regards, | John | | "John Smith" wrote in message | ... || This is a SWR bridge I built using leds and a homemade "directional || coupler." || || ALL critiques on it, and ideas for improvements are welcomed!!! || || Please excuse my rough drawing, I am NOT a draftsperson! || || Hopefully, the attachment of the .jpg was successful.... || || Warmest regards, || John || || | | |
On Fri, 6 May 2005 18:43:37 -0700, "John Smith"
wrote: Anyway, will build this tomorrow... http://blake.prohosting.com/mailguy2/johnsmith.jpg How shall I compare thee to a blighted operation? Let me count the ways: 1. It won't work. Need I say why? (Hint: review all my other postings that describe exactly why.) This example is yet another in a long list of repetition in the vain hope of a different outcome. 73's Richard Clark, KB7QHC |
Richard:
It is taken from your beloved ARRL!!!! "God" (ARRL) sanctioned the most part of it! grin We'll see... Warmest regards, John "Richard Clark" wrote in message ... | On Fri, 6 May 2005 18:43:37 -0700, "John Smith" | wrote: | | Anyway, will build this tomorrow... | http://blake.prohosting.com/mailguy2/johnsmith.jpg | | How shall I compare thee to a blighted operation? | | Let me count the ways: | | 1. It won't work. | | Need I say why? (Hint: review all my other postings that describe | exactly why.) This example is yet another in a long list of | repetition in the vain hope of a different outcome. | | 73's | Richard Clark, KB7QHC |
.... all kidding aside--it has to, that 1Mh choke would choke HF Audio freqs!
Has to be a high impedance to the RF freqs I mentioned (will look at a chart later.) Yanno Richard, I think I grow fonder of you each day--Monday I am calling the "clinic" about my three day observation... joking-grin Warmest regards, John "Richard Clark" wrote in message ... | On Fri, 6 May 2005 18:43:37 -0700, "John Smith" | wrote: | | Anyway, will build this tomorrow... | http://blake.prohosting.com/mailguy2/johnsmith.jpg | | How shall I compare thee to a blighted operation? | | Let me count the ways: | | 1. It won't work. | | Need I say why? (Hint: review all my other postings that describe | exactly why.) This example is yet another in a long list of | repetition in the vain hope of a different outcome. | | 73's | Richard Clark, KB7QHC |
On Fri, 06 May 2005 18:53:47 -0700, Richard Clark
wrote: Need I say why? On deeper inspection, I obviously missed much - there is far more to kill this application than has been previously attempted. I guess in that respect it makes insanity a condition akin to the common head cold, because the design offered compounds error through new, and novel elaborations of the same problems revealed before. In some respect, it is like watching machine learning where the robots thump into the same maze walls trying to find a path. Meanwhile, the mouse (whose progenitors learned the right hand rule) is nibbling the cheese. 73's Richard Clark, KB7QHC |
On Fri, 6 May 2005 19:00:59 -0700, "John Smith"
wrote: It is taken from your beloved ARRL! What do you mean mine, kemosabbee? The resemblance you ascribe has major departures that are your invention alone. They may qualify for Patent rights as Reggie so loves to point out, and you may make a fortune by them in this era of crippled intellectual (sic) property rights. But the fact remains, what this circuit will demonstrate is so remote from the description of its purpose as to be suitable for an Oscar. 73's Richard Clark, KB7QHC |
On Fri, 6 May 2005 19:05:27 -0700, "John Smith"
wrote: ... all kidding aside--it has to, that 1Mh choke would choke HF Audio freqs! All the kidding is in the choke which guarantees no LED will ever light. Below KW levels that is (you seem to miss this key clue every time) and not even then unless the whole rig arcs over. I wouldn't count on a constant current device then either (another key clue that is wholly ignored). 73's Richard Clark, KB7QHC |
OK, Richard:
You have me anxious--I may indeed find what you say, is true, I am hoping not--but disappointment is a well known companion of mine, I'd miss him if he were gone... ....tomorrow will be soon enough, after I sleep in--I need it... if there is something to learn here--I will simply enjoy it all the more!!! Warmest regards, John "Richard Clark" wrote in message ... | On Fri, 06 May 2005 18:53:47 -0700, Richard Clark | wrote: | | Need I say why? | | On deeper inspection, I obviously missed much - there is far more to | kill this application than has been previously attempted. | | I guess in that respect it makes insanity a condition akin to the | common head cold, because the design offered compounds error through | new, and novel elaborations of the same problems revealed before. | | In some respect, it is like watching machine learning where the robots | thump into the same maze walls trying to find a path. Meanwhile, the | mouse (whose progenitors learned the right hand rule) is nibbling the | cheese. | | 73's | Richard Clark, KB7QHC |
"Cecil Moore" wrote in message ... John Smith wrote: Well, If there is a voltage, there is a current (albeit, at times very small)--the opposite is also true, ohms law is standing proof... Yes, but the amplitude and phase relationship of current to voltage can have any possible value and there are an infinite number of possibilities. In the equation, Z = V/I, you cannot determine Z unless you know BOTH V and I. Why can't I measure the standing wave ratio as a ratio of power, ... You need both voltage and current to determine power. Your design senses only current. -- 73, Cecil http://www.qsl.net/w5dxp Cecil is right. Also, the 100K implies 200V to get 2ma of LED current. The 1N914 won't hack that. Tam/WB2TT ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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