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#1
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Wes Stewart ...
^ Antennas are reciprocal, if they wouldn't work well for ^ transmitting, they will work equally poorly for receiving. I don't believe that. It's been my experience that an antenna used for receiving will function satisfactorily over a much broader range of conditions (environment, antenna length, etc.) than it will if used for transmitting under those same conditions. Frank |
#2
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Believe what you will, the law of reciprocity will ignore your beliefs and
continue to function. "Frank" wrote in message news:01c3b0a2$989de120$0125250a@cqvdqntcxxawvjpo.. . Wes Stewart ... ^ Antennas are reciprocal, if they wouldn't work well for ^ transmitting, they will work equally poorly for receiving. I don't believe that. It's been my experience that an antenna used for receiving will function satisfactorily over a much broader range of conditions (environment, antenna length, etc.) than it will if used for transmitting under those same conditions. Frank |
#3
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In article , "w4jle" W4JLE(remove this
to wrote: Believe what you will, the law of reciprocity will ignore your beliefs and continue to function. 1. It's only a "law" for scalar radiation (like sound), not vector radiation (radio). To be sure, it's a fine approximation for most HF antenna systems, but watch out a microwave frequencies, especially if your antenna system contains a "circulator". 2. In the cases where reciprocity applies you would be correct to say that it requires that the antenna directivity and efficiency are the same for transmitting and receiving. It does not follow, however, that a poor transmitting antenna is necessarily a poor receiving antenna. Efficiency matters much more when transmitting than it does when receiving. Franks's observations are correct, and can be verified if you do a detailed signal to noise calculation. You could also try the experiment yourself. "Frank" wrote in message news:01c3b0a2$989de120$0125250a@cqvdqntcxxawvjpo.. . Wes Stewart ... ^ Antennas are reciprocal, if they wouldn't work well for ^ transmitting, they will work equally poorly for receiving. I don't believe that. It's been my experience that an antenna used for receiving will function satisfactorily over a much broader range of conditions (environment, antenna length, etc.) than it will if used for transmitting under those same conditions. Frank -- | John Doty "You can't confuse me, that's my job." | Home: | Work: |
#4
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On Fri, 21 Nov 2003 23:17:33 +0500, "John Doty" wrote:
|In article , "w4jle" W4JLE(remove this |to wrote: | | Believe what you will, the law of reciprocity will ignore your beliefs | and continue to function. | |1. It's only a "law" for scalar radiation (like sound), not vector |radiation (radio). To be sure, it's a fine approximation for most HF |antenna systems, but watch out a microwave frequencies, especially if your |antenna system contains a "circulator". Heh heh. When the guys from MIT come out to argue with you, you know you're in trouble. But fools rush in... I have made thousands of measurements in anechoic antenna ranges and I have never seen a difference between measuring s21 and s12. (Without the circulators, and accounting for mismatch effects of course) Where did I go wrong? |2. In the cases where reciprocity applies you would be correct to say that |it requires that the antenna directivity and efficiency are the same for |transmitting and receiving. It does not follow, however, that a poor |transmitting antenna is necessarily a poor receiving antenna. Efficiency |matters much more when transmitting than it does when receiving. It also does not follow that a lousy receiving antenna is good enough. For example, I *always* got better moon echos on 2-meter EME using the same antenna for transmit and receive. When I tried a wet string on receive I didn't hear nuthin' g I have observed the same on 20 meters. My Yagi at a modest height of 50 feet is *always* better than an indoor wire. | |Franks's observations are correct, and can be verified if you do a |detailed signal to noise calculation. You could also try the experiment |yourself. Two experiments cited above. |
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In article , "Wes Stewart"
wrote: Heh heh. When the guys from MIT come out to argue with you, you know you're in trouble. But fools rush in... I have made thousands of measurements in anechoic antenna ranges and I have never seen a difference between measuring s21 and s12. (Without the circulators, and accounting for mismatch effects of course) Where did I go wrong? You didn't ionize the air in the range :-) Seriously, for your purposes you did nothing wrong. Just don't call reciprocity a "law", OK? It's a useful idea of wide applicability, but physics does not require it in general. Calling it a law confuses people. Many years ago in grad school my advisor would vex visitors to his office with a little disk that looked like a piece of tinted glass. Put a quarter on the table, put the disk on top of it, the quarter looks black. Flip the disk over, put it back on the quarter, the quarter looks shiny. What was the construction of this thing? Some world class physicists couldn't figure it out. |2. In the cases where reciprocity applies you would be correct to say that |it requires that the antenna directivity and efficiency are the same for |transmitting and receiving. It does not follow, however, that a poor |transmitting antenna is necessarily a poor receiving antenna. Efficiency |matters much more when transmitting than it does when receiving. It also does not follow that a lousy receiving antenna is good enough. For example, I *always* got better moon echos on 2-meter EME using the same antenna for transmit and receive. When I tried a wet string on receive I didn't hear nuthin' g Directivity matters equally for receiving and transmitting. Was your wet string as directive as your other antenna? 2 meters is also quiet enough that there's not much room for inefficiency: in some directions the sky temperature is 200K. I have observed the same on 20 meters. My Yagi at a modest height of 50 feet is *always* better than an indoor wire. Throw a thin wire with dark brown insulation over a tall tree, up over one side, partway down the other (shaped like a "?"). Tie it in place with nylon fishing line. It will be invisible unless you're very close. Couple to coax with a grounded 9:1 broadband matching transformer. Bury the coax run to the house. Not only will this be much less conspicuous than a Yagi, but it will outperform your Yagi as a receiving antenna for nearly every signal over the range 100 kHz - 30 MHz. A Yagi is just too specialized an antenna for a listener. A trailing wire under sea water receives just fine at ELF and doesn't work worth a damn for transmitting. But those are special cases that can always be manufactured. Beverage antennas are also not something to be used for transmitting but you won't be disguising one as a chimney cap either For the listener from ELF to HF these are not manufactured special cases, they are the general case. MW and tropical band listeners often target their regions of interest with Beverages, either temporary or permanent. A Beverage is another antenna that can be very inconspicuous: if your soil's dry you can even bury a Beverage! For listening, a simple broadband antenna like a Beverage is much more practical than a complicated narrowband antenna like a Yagi. In the general sense of h-f to microwave, I stand by my claim. For the special case of confinement to a small number of narrow bands (as in ham radio), you are reasonably correct above 10 MHz. To me as a hobbyist listing to LW/MW/SW, that isn't the general case. Of course the game changes when I'm operating a satellite, but that isn't my *hobby*. -- | John Doty "You can't confuse me, that's my job." | Home: | Work: |
#6
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On Sat, 22 Nov 2003 10:23:52 +0500, "John Doty" wrote:
|In article , "Wes Stewart" wrote: | | Heh heh. When the guys from MIT come out to argue with you, you know | you're in trouble. But fools rush in... | | I have made thousands of measurements in anechoic antenna ranges and I | have never seen a difference between measuring s21 and s12. (Without the | circulators, and accounting for mismatch effects of course) | | Where did I go wrong? | |You didn't ionize the air in the range :-) | |Seriously, for your purposes you did nothing wrong. Just don't call |reciprocity a "law", OK? It's a useful idea of wide applicability, but |physics does not require it in general. Calling it a law confuses people. I never made that statement. [snip] | |Directivity matters equally for receiving and transmitting. Was your wet |string as directive as your other antenna? I don't know. Remember I live in the desert; I couldn't keep the string wet long enough to find out. |2 meters is also quiet enough |that there's not much room for inefficiency: in some directions the sky |temperature is 200K. Yep. Love that quiet sky. | | | I have observed the same on 20 meters. My Yagi at a modest height of | 50 feet is *always* better than an indoor wire. | |Throw a thin wire with dark brown insulation over a tall tree, up over one |side, partway down the other (shaped like a "?"). Tie it in place with |nylon fishing line. It will be invisible unless you're very close. Couple |to coax with a grounded 9:1 broadband matching transformer. Bury the coax |run to the house. Tall tree? What's a tall tree? The best I have is some 35 foot tall Saguaro cactii. They're a bitch to climb, although when the coyotes went after the cat, she managed. Let's see, I could tie a string to the cat's tail and find a coyote..... [snip] | In the general sense of h-f to microwave, I stand by my claim. | |For the special case of confinement to a small number of narrow bands (as |in ham radio), you are reasonably correct above 10 MHz. To me as a |hobbyist listing to LW/MW/SW, that isn't the general case. Of course the |game changes when I'm operating a satellite, but that isn't my *hobby*. See, one of the groups this got cross-posted to is an *Amateur Radio Antenna* group. I'm reading and writing it from this group and commenting from that perspective. I normally don't cross post but did the first one by accident and since I've developed such a loyal following I didn't want to lose anybody G. Regards, Wes Stewart, N7WS |
#7
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Wes Stewart ...
^ Tall tree? What's a tall tree? The best I have is some ^ 35 foot tall Saguaro cactii. That might serve as a 40m vertical if the roots are dry and shallow. Frank |
#8
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In article , "Wes Stewart"
wrote: |Seriously, for your purposes you did nothing wrong. Just don't call |reciprocity a "law", OK? It's a useful idea of wide applicability, but |physics does not require it in general. Calling it a law confuses people. I never made that statement. Oops, you're right.. It was "w4jle". But you took his side :-) See, one of the groups this got cross-posted to is an *Amateur Radio Antenna* group. I'm reading and writing it from this group and commenting from that perspective. I normally don't cross post but did the first one by accident and since I've developed such a loyal following I didn't want to lose anybody G. But we were discussing Frank's observation: It's been my experience that an antenna used for receiving will function satisfactorily over a much broader range of conditions (environment, antenna length, etc.) than it will if used for transmitting under those same conditions. Certainly below 30 MHz this is represents a correct observation, verifiable both by calculation and experiment. Why should this reality change with the newsgroup? Tall tree? What's a tall tree? The best I have is some 35 foot tall Saguaro cactii. They're a bitch to climb, although when the coyotes went after the cat, she managed. Let's see, I could tie a string to the cat's tail and find a coyote..... Sounds like you're in "Beverage on the ground" territory. That works too, I'm told (I live next to a swamp, so the tall maples are my friends :-). I've never tried a Beverage on the ground, although I have used a long skinny island as a slot antenna (worked very well from longwave through tropical bands, useless above 10 MHz). -- | John Doty "You can't confuse me, that's my job." | Home: | Work: |
#9
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On Sat, 22 Nov 2003 02:44:57 -0000, "Frank"
wrote: |Wes Stewart ... | |^ Antennas are reciprocal, if they wouldn't work well for |^ transmitting, they will work equally poorly for receiving. | |I don't believe that. It's been my experience that an antenna used for |receiving will function satisfactorily over a much broader range of |conditions (environment, antenna length, etc.) than it will if used for |transmitting under those same conditions. Mmm. In the case of atmospheric limited SNRs that is true. A trailing wire under sea water receives just fine at ELF and doesn't work worth a damn for transmitting. But those are special cases that can always be manufactured. Beverage antennas are also not something to be used for transmitting but you won't be disguising one as a chimney cap either In the general sense of h-f to microwave, I stand by my claim. Wes |
#10
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HOAs are one of those things that sound good in theory, but often abused in
actual practice. Nobody can argue with the premise of keeping your neighbor from starting a junk car collection or allowing the grass to get knee-high and go to seed. The problem is that the HANs (Homeowner Association Nazis) get carried away and corrupted with their power. I once made the mistake of living under the thumb of the HANs. Actually, I didn't have much choice in the matter. In Phoenix, you either live in a deed-restricted home or else you live in the hood. All desirable communities are controlled by overbearing HANs. During the time I was there, I received several "violation notices" for petty issues. There was the time I got one for "parking on the grass." Actually, I was parked on the driveway, but had my vehicle over on the far left as to allow sufficient space for the other vehicle which was parked in the garage. Didn't want the wife to have a "blonde moment" and hit me as she backed out! My tape measure showed my rear left tire to be 3.5 inches off of the pavement. According to the HANs, this constitutes "parking on the grass." Then there was the time I was cited for "improper display of address." All homes are required to display standard-issue black address numerals in a specific location on the house. (Kinda sounds like branding identifiers on foreheads, doesn't it?) I had the HAN required numbers in the HAN designated place. No problem there. But a shrub which had been planted below the numerals had now began to grow towards the house numbers. Again, I grabbed my tape measure. The top of the shrub extended approximately 1/2 inch past the bottom of the 6 inch numerals. According to the HANs, this constitutes "improper display of address." You basically have no rights when confronting these quasi-governmental agencies. If you don't comply with the violation notices within a specified period of time (usually 10 days), the HANs will file a lawsuit against you for non-compliance. If you choose to go to court, they will then use YOUR money (collected in the form of homeowners association dues) to fight against you until your funds are depleted and you give up in frustration. They will then sue you again for reimbursement of their attorneys fees. If you don't pay, they will secure a lien against your house. If you still don't pay, they will sell your house out from under you! Under the terms of the HAN agreement, they can do this. You relinquish all your legal rights of ownership when you sign one of these restrictive covenants. There have been numerous instances where HANs have taken the homes of elderly people on fixed incomes (who fell behind in their dues) and war veterans who have erected flag poles on their property. Folks, these things are bad news. Avoid them if at all possible. Fortunately, I moved away from Phoenix and am no longer controlled by the HANs. Here in South Dakota, these fiefdoms are pretty much non-existant. Private property rights are accepted and expected here. If I want to put up an antenna or change my oil in my driveway, I have the right to do so. As I should, since it's MY PROPERTY. |
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