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ladderline to coax adapter
Got a Radio Works choke balun I'd like to use for feeding ladderline out of
an unbalanced tuner. The balun has coax fittings on each end. Ladderline doesn't adapt well to coax interfaces. What's the best way to put ladderline to my balun coax fitting? I can kluge a PL-259 plug onto the ladderline. I guess I could also stick one side of the ladderline in the center hole of the chassis coac fitting, and clamp the other side to the threaded part of the chassis fitting. Ideas solicited. |
ladderline to coax adapter
Got a Radio Works choke balun I'd like to use for feeding ladderline out of an unbalanced tuner. I'm sure others here will correct me if I'm wrong, but I believe that what you want to do is a very bad idea. Baluns are not meant to operate under the potential very high SWR conditions you are likely to have on the output of your tuner. Damage to the balun is likely. Besides, what is the point of a balun on your tuner's output if you are using ladderline, anyway? Ed K7AAT |
ladderline to coax adapter
Why are you using a choke at that point in the system? You should use
either a 1:1 or 4:1 current balun to go from coax to ladderline..and keep the coax VERY short to minimize losses on it due to high SWR. A choke is for something entirely different. Jim/K2TL |
ladderline to coax adapter
RB wrote:
Got a Radio Works choke balun I'd like to use for feeding ladderline out of an unbalanced tuner. The balun has coax fittings on each end. Sounds like it is actually a UNUN. I can kluge a PL-259 plug onto the ladderline. That will work. I usually just splice a short piece of coax to the ladder-line. -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Ed wrote:
Got a Radio Works choke balun I'd like to use for feeding ladderline out of an unbalanced tuner. I'm sure others here will correct me if I'm wrong, but I believe that what you want to do is a very bad idea. Baluns are not meant to operate under the potential very high SWR conditions ... It depends on whether the very high SWR is on the ladder-line side or on the coax side. :-) -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Thanks, Cecil. Guess that's what I'll do. I don't think there is any
"graceful" way of going from ladderline to coax. }}} Sounds like it is actually a UNUN. {{{ I THOUGHT the choke baluns are unbalanced to balanced, and will work OK for the purpose of feeding ladderline. Although they're electrically symmetrical (unbalanced rf goes in one end, and balanced rf comes out the other. Flip 'em around and it's the same, either way). If they're not, I need to know it so I can go to another kind. |
ladderline to coax adapter
RB wrote:
}}} Sounds like it is actually a UNUN. {{{ I THOUGHT the choke baluns are unbalanced to balanced, and will work OK for the purpose of feeding ladderline. I was half joking. A choke can often function equally well as a UNUN or a BALUN. A W2DU choke, for instance, doesn't "know" whether it is in a balanced or unbalanced environment. -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Cecil Moore wrote in
. net: Ed wrote: Got a Radio Works choke balun I'd like to use for feeding ladderline out of an unbalanced tuner. I'm sure others here will correct me if I'm wrong, but I believe that what you want to do is a very bad idea. Baluns are not meant to operate under the potential very high SWR conditions ... It depends on whether the very high SWR is on the ladder-line side or on the coax side. :-) Well, he said "OUT of an unbalanced tuner" so I assume that's the ladderline side. Ed K7AAT |
ladderline to coax adapter
Cecil Moore wrote in
. net: RB wrote: }}} Sounds like it is actually a UNUN. {{{ I THOUGHT the choke baluns are unbalanced to balanced, and will work OK for the purpose of feeding ladderline. I was half joking. A choke can often function equally well as a UNUN or a BALUN. A W2DU choke, for instance, doesn't "know" whether it is in a balanced or unbalanced environment. Guys, please help me here. You are talking about UNUNs and BALUNs. A balanced tuner OUTPUT to ladderline is BALANCED TO BALANCED , isn't it? Why the need for anything, there? Ed K7AAT |
ladderline to coax adapter
On Mon, 07 Nov 2005 22:39:33 GMT, Ed
wrote: Guys, please help me here. You are talking about UNUNs and BALUNs. A balanced tuner OUTPUT to ladderline is BALANCED TO BALANCED , isn't it? Why the need for anything, there? Ed K7AAT Ed, His original posting said: "Got a Radio Works choke balun I'd like to use for feeding ladderline out of an *unbalanced* tuner." Danny, K6MHE email: k6mheatarrldotnet http://www.k6mhe.com/ |
ladderline to coax adapter
On Mon, 7 Nov 2005 12:07:30 -0600, "RB"
wrote: Got a Radio Works choke balun I'd like to use for feeding ladderline out of an unbalanced tuner. The balun has coax fittings on each end. I think from the sound of your description you have one of their "isolaters" that has a coax socket on both ends. These things are very neat when used to "choke" currents on the outer of coax. Ladderline doesn't adapt well to coax interfaces. What's the best way to put ladderline to my balun coax fitting? I can kluge a PL-259 plug onto the ladderline. I guess I could also stick one side of the ladderline in the center hole of the chassis coac fitting, and clamp the other side to the threaded part of the chassis fitting. That doesn't sound reliable, the "stick one side of the ladderline in the center hole" bit, that is. How would you maintain reliable centre contact. (BTW, you probably already know that 4mm banana plugs fit into SO-239 neatly.) What is your problem, is it the "inelegance" of soldering the openwire ends to the coax plug, or are you concerned about impedance discontinuity at presumably HF / 6m? I am sure that you could look around and find adapters, I can think of a few ways myself, but... If it is not in the weather, I would just solder the ends of the open wire to a PL-257 and screw in on. You could sleeve the end going to the centre conductor to improve its flashover voltage if that is likely to be an issue. (BTW, taking the earth side wire down inside the PL259 and bringing it out the braid hole will give you quite a neat finish.) Owen -- |
ladderline to coax adapter
Ed wrote:
Cecil Moore wrote: It depends on whether the very high SWR is on the ladder-line side or on the coax side. :-) Well, he said "OUT of an unbalanced tuner" so I assume that's the ladderline side. Yes, and with a reasonable limit, the SWR on the ladder-line doesn't matter. IMO, 25:1 is no problem for ladder-line. -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
On Mon, 07 Nov 2005 23:26:47 GMT, Cecil Moore wrote:
Yes, and with a reasonable limit, the SWR on the ladder-line doesn't matter. IMO, 25:1 is no problem for ladder-line. There must be a host of unstated assumptions behind that statement to make it valid in a limited scenario. Using TLDETAILS to work up a load of 16+j0 on 100m of Wireman551 ladder-line at 30MHz, the predicted VSWR varies between 25 at the load end and a very modest 6.5 at the generator end, yet the predicted loss is around 6dB. Some might not find that an acceptable loss. Owen -- |
ladderline to coax adapter
Owen Duffy wrote:
Using TLDETAILS to work up a load of 16+j0 on 100m of Wireman551 ladder-line at 30MHz, the predicted VSWR varies between 25 at the load end and a very modest 6.5 at the generator end, yet the predicted loss is around 6dB. Some might not find that an acceptable loss. If 100m (325 feet) of ladder-line results in 6dB loss, then a more realistic 75 feet of ladder-line will result in about 1.4 dB of loss. That's only 1/4 of an S-unit on the highest frequency HF band and less on the other bands. That's perfectly acceptable to me and virtually indistinguishable on an S-meter. If you have to resort to 325 feet of ladder-line on 30 MHz to try to prove me wrong, I feel really sorry for you. Why didn't you choose a million feet to prove me even more wrong? It appears that you are lurking there in the down under outback just waiting for me to forget to cross an 'i' or dot a 't'. -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Well, he said "OUT of an unbalanced tuner" so I assume that's the ladderline side. Yes, and with a reasonable limit, the SWR on the ladder-line doesn't matter. IMO, 25:1 is no problem for ladder-line. Correct, a high SWR is not an issue for ladderline, but the guy was wanting to stick an apparently 50 ohm coax balun right there in between his balanced tuner output and that ladder line. I would think a high SWR, with some TX power, in that device might not do it much good. Ed |
ladderline to coax adapter
Guys, please help me here. You are talking about UNUNs and BALUNs. A balanced tuner OUTPUT to ladderline is BALANCED TO BALANCED , isn't it? Why the need for anything, there? His original posting said: "Got a Radio Works choke balun I'd like to use for feeding ladderline out of an *unbalanced* tuner." My sincere appologies to this thread group. I read that original post twice and still missed that the tuner was unbalanced output. Makes a lot more sense, now. Ed K7AAT |
ladderline to coax adapter
On Tue, 08 Nov 2005 02:09:13 GMT, Cecil Moore wrote:
Owen Duffy wrote: Using TLDETAILS to work up a load of 16+j0 on 100m of Wireman551 ladder-line at 30MHz, the predicted VSWR varies between 25 at the load end and a very modest 6.5 at the generator end, yet the predicted loss is around 6dB. Some might not find that an acceptable loss. If 100m (325 feet) of ladder-line results in 6dB loss, then a more realistic 75 feet of ladder-line will result in about 1.4 dB of loss. Close, I make it 2.2dB. (The loss per meter is not a constant figure in this situation.) Agreed, even that is not a large amount, and indeed might be quite acceptable in many / most cases. That's only 1/4 of an S-unit on the highest frequency HF band and less on the other bands. That's perfectly acceptable to me and virtually indistinguishable on an S-meter. If you have to resort to 325 feet of ladder-line on 30 MHz to try to prove me wrong, I feel really sorry for you. Why didn't you choose a million feet to prove me even more wrong? It appears that you are lurking there in the down under outback just waiting for me to forget to cross an 'i' or dot a 't'. Cecil, people often employ long runs of open wire feed on HF (ie up to 30MHz), and it just shows that on longer runs, high VSWR can be an issue for ladder line. I often hear Rules of Thumb (ROT) like VSWR 3 is OK for coax and 25 if fine for open wire, or the converse... but something is lost in the brief expression of those ROTs, and it seems more and more the knowledge base of our hobby is the ROTs, rather than the underlying principles. There is an appeal to the new experts in our hobby to pickup the ROTs and parrot them... perhaps we need to take the time to qualify what we say where learners are listening. Owen -- |
ladderline to coax adapter
On Tue, 08 Nov 2005 03:07:10 GMT, Owen Duffy wrote:
I often hear Rules of Thumb (ROT) like VSWR 3 is OK for coax and 25 if fine for open wire, or the converse... but something is lost in the brief expression of those ROTs, and it seems more and more the knowledge base of our hobby is the ROTs, rather than the underlying principles. There is an appeal to the new experts in our hobby to pickup the ROTs and parrot them... perhaps we need to take the time to qualify what we say where learners are listening. Owen Owen, The problem is that knowing the SWR is not worth much without knowing the frequency and the spec's of the transmission line. For example an SWR ratio of 10:1 using a hundred feet of RG-217 on the 80-meter band is only about 1 dB loss. On 10-meters its a different story. I still subscribe to the belief that judging antenna performance based solely upon SWR is like judging how well a automobile will perform based solely on what the air pressure is in the tires. Danny, K6MHE email: k6mheatarrldotnet http://www.k6mhe.com/ |
ladderline to coax adapter
How many hams find a feedline length of 100 Meters acceptable? Lets look at
a more realistic length of 100 feet and the loss is less than 2 dB at 30 Mhz. The loss is much less on the lower bands. With all due respect, your example sucks! "Owen Duffy" wrote in message ... On Mon, 07 Nov 2005 23:26:47 GMT, Cecil Moore wrote: Yes, and with a reasonable limit, the SWR on the ladder-line doesn't matter. IMO, 25:1 is no problem for ladder-line. There must be a host of unstated assumptions behind that statement to make it valid in a limited scenario. Using TLDETAILS to work up a load of 16+j0 on 100m of Wireman551 ladder-line at 30MHz, the predicted VSWR varies between 25 at the load end and a very modest 6.5 at the generator end, yet the predicted loss is around 6dB. Some might not find that an acceptable loss. Owen -- |
ladderline to coax adapter
On Mon, 07 Nov 2005 19:16:08 -0800, Dan Richardson wrote:
On Tue, 08 Nov 2005 03:07:10 GMT, Owen Duffy wrote: I often hear Rules of Thumb (ROT) like VSWR 3 is OK for coax and 25 if fine for open wire, or the converse... but something is lost in the brief expression of those ROTs, and it seems more and more the knowledge base of our hobby is the ROTs, rather than the underlying principles. There is an appeal to the new experts in our hobby to pickup the ROTs and parrot them... perhaps we need to take the time to qualify what we say where learners are listening. Owen Owen, The problem is that knowing the SWR is not worth much without knowing the frequency and the spec's of the transmission line. .... including the length. I agree fully. Owen -- |
ladderline to coax adapter
On Mon, 7 Nov 2005 22:21:35 -0500, "Fred W4JLE"
wrote: How many hams find a feedline length of 100 Meters acceptable? Lets look at a more realistic length of 100 feet and the loss is less than 2 dB at 30 Mhz. The loss is much less on the lower bands. With all due respect, your example sucks! BTW, I make your example 2.7dB, not less than 2dB. (Perhaps you labour under the misaprehension that loss per unit length is a constant in this situation). Fred, what you have highlighted is the unstated assumption of some limit on length. You know enough to choose a length so that the ROT is true, but does a learner soaking this up know as much? Owen -- |
ladderline to coax adapter
Dan Richardson wrote - The problem is that knowing the SWR is not worth much without knowing the frequency and the spec's of the transmission line. ================================== The REAL problem is that very few people know the SWR on the transmission line because the SWR meter doesn't measure it. Aren't you are fooling yourselves? ---- Reg. |
ladderline to coax adapter
On Tue, 08 Nov 2005 03:40:33 GMT, Owen Duffy wrote:
On Mon, 07 Nov 2005 19:16:08 -0800, Dan Richardson wrote: On Tue, 08 Nov 2005 03:07:10 GMT, Owen Duffy wrote: I often hear Rules of Thumb (ROT) like VSWR 3 is OK for coax and 25 if fine for open wire, or the converse... but something is lost in the brief expression of those ROTs, and it seems more and more the knowledge base of our hobby is the ROTs, rather than the underlying principles. There is an appeal to the new experts in our hobby to pickup the ROTs and parrot them... perhaps we need to take the time to qualify what we say where learners are listening. Owen Owen, The problem is that knowing the SWR is not worth much without knowing the frequency and the spec's of the transmission line. ... including the length. I agree fully. Owen Yep, I forgot to add that. Thanks Danny, K6MHE email: k6mheatarrldotnet http://www.k6mhe.com/ |
ladderline to coax adapter
Owen Duffy wrote:
It appears that you are lurking there in the down under outback just waiting for me to forget to cross an 'i' or dot a 't'. Cecil, people often employ long runs of open wire feed on HF (ie up to 30MHz), and it just shows that on longer runs, high VSWR can be an issue for ladder line. Guess I should have put a smiley face on my above posting. Did you miss the humor? -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Owen Duffy wrote:
Cecil Moore wrote: If 100m (325 feet) of ladder-line results in 6dB loss, then a more realistic 75 feet of ladder-line will result in about 1.4 dB of loss. Close, I make it 2.2dB. What matched line loss are you using? The wireman says that line has about 0.2 dB of matched line loss per 100 ft at 30 MHz. According to the chart in my ARRL Antenna Book, an SWR of 25:1 at the load would cause about 1.5 dB loss in 75 feet. ... waiting for me to forget to cross an 'i' or dot a 't'. Cecil, people often employ long runs of open wire feed on HF ... Did you miss the humor? -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Reg Edwards wrote:
The REAL problem is that very few people know the SWR on the transmission line because the SWR meter doesn't measure it. Aren't you are fooling yourselves? A host of us use EZNEC and other modeling programs, like you publish, to estimate the SWR and therefore the losses. -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Guess I should have put a smiley face on my above posting. Did you miss the humor? =============================== Cec, even as a foreigner I seldom miss your humor, smileys or not. Thank heavens, on the Internet, the English and American lanuages are drawing closely together. But I am still inclined to draw a distinction beween Americans and USA citizens. They are different! --- Reg. |
ladderline to coax adapter
Reg Edwards wrote:
Thank heavens, on the Internet, the English and American lanuages are drawing closely together. But I am still inclined to draw a distinction beween Americans and USA citizens. They are different! And Texans are even more so. Ours is the only state whose flag is allowed to be flown at an equal height with the US flag. (Some places around here fly the Texas flag an inch or so higher than that damned Yankee flag. :-) Texas was the only state having the legal right to seceed from the USA during the Civil War. The last battle of the Civil war was fought near Brownsville, TX and the South won. Reg, I saw a program on "The Discovery Channel: Ice Age Columbus: Who Were the First Americans?" It said, based on the latest arrowhead and tool archaeological evidence, that America was discovered by sea-going ice-age Europeans 17,000 years before Columbus made his voyage. It was asserted that some Native Americans still carry the genetic markers donated by those early Europeans. -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Cecil Moore wrote:
Reg Edwards wrote: Thank heavens, on the Internet, the English and American lanuages are drawing closely together. But I am still inclined to draw a distinction beween Americans and USA citizens. They are different! And Texans are even more so. SNIPPED: That great ICON of America, John Wayne of Blessed Memory, asserted that the residents of Texas were TEXICANS! [Not Americans and NOT citizens of USA]. How does this impact citizenship?? Cecil, you opened a bag of Texas Nightcrawlers [Bass bait worms] with your Texas comment. :-) AK Ours is the only state whose flag is allowed to be flown at an equal height with the US flag. (Some places around here fly the Texas flag an inch or so higher than that damned Yankee flag. :-) Texas was the only state having the legal right to seceed from the USA during the Civil War. The last battle of the Civil war was fought near Brownsville, TX and the South won. Reg, I saw a program on "The Discovery Channel: Ice Age Columbus: Who Were the First Americans?" It said, based on the latest arrowhead and tool archaeological evidence, that America was discovered by sea-going ice-age Europeans 17,000 years before Columbus made his voyage. It was asserted that some Native Americans still carry the genetic markers donated by those early Europeans. |
ladderline to coax adapter
On Tue, 08 Nov 2005 12:03:11 -0500, Amos Keag
wrote: Cecil Moore wrote: Reg Edwards wrote: Thank heavens, on the Internet, the English and American lanuages are drawing closely together. But I am still inclined to draw a distinction beween Americans and USA citizens. They are different! And Texans are even more so. SNIPPED: That great ICON of America, John Wayne of Blessed Memory, asserted that the residents of Texas were TEXICANS! [Not Americans and NOT citizens of USA]. How does this impact citizenship?? I believe Texas also used to be its own independent country, the Republic of Texas. Sam Houston was president. We were called Texians. (And John Wayne was not a Texian, Texican, Texan or any other deriviative.) Bob k5qwg Cecil, you opened a bag of Texas Nightcrawlers [Bass bait worms] with your Texas comment. :-) AK Ours is the only state whose flag is allowed to be flown at an equal height with the US flag. (Some places around here fly the Texas flag an inch or so higher than that damned Yankee flag. :-) Texas was the only state having the legal right to seceed from the USA during the Civil War. The last battle of the Civil war was fought near Brownsville, TX and the South won. Reg, I saw a program on "The Discovery Channel: Ice Age Columbus: Who Were the First Americans?" It said, based on the latest arrowhead and tool archaeological evidence, that America was discovered by sea-going ice-age Europeans 17,000 years before Columbus made his voyage. It was asserted that some Native Americans still carry the genetic markers donated by those early Europeans. |
ladderline to coax adapter
I choose a ladderline length to always feed the antenna at a current node.
"Owen Duffy" wrote in message ... On Mon, 7 Nov 2005 22:21:35 -0500, "Fred W4JLE" wrote: How many hams find a feedline length of 100 Meters acceptable? Lets look at a more realistic length of 100 feet and the loss is less than 2 dB at 30 Mhz. The loss is much less on the lower bands. With all due respect, your example sucks! BTW, I make your example 2.7dB, not less than 2dB. (Perhaps you labour under the misaprehension that loss per unit length is a constant in this situation). Fred, what you have highlighted is the unstated assumption of some limit on length. You know enough to choose a length so that the ROT is true, but does a learner soaking this up know as much? Owen -- |
ladderline to coax adapter
Amos Keag wrote:
SNIPPED: That great ICON of America, John Wayne of Blessed Memory, asserted that the residents of Texas were TEXICANS! [Not Americans and NOT citizens of USA]. How does this impact citizenship?? Some Texans never wanted to join the United States and it was a close vote back when Texas was an independent country. Sam Houston was probably the deciding factor. If Texas had not joined the US, we probably would still have plenty of $60 a gallon oil. (Inside intel as opposed to Intel Inside(R)): I once worked for Schlumberger and Texas is definitely NOT out of oil, i.e. Lots of oil is being held in reserve in cases of arrested development as it is in Florida, California, and Alaska.) -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Fred W4JLE wrote:
I choose a ladderline length to always feed the antenna at a current node. And because a current node is guaranteed to occur at least every 1/2WL, an HF feedline need never be longer than 164 feet, Owen's 100 meter feedline notwithstanding. :-) -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
On Tue, 08 Nov 2005 15:33:01 GMT, Cecil Moore wrote:
Owen Duffy wrote: Cecil Moore wrote: If 100m (325 feet) of ladder-line results in 6dB loss, then a more realistic 75 feet of ladder-line will result in about 1.4 dB of loss. Close, I make it 2.2dB. What matched line loss are you using? The wireman says that line has about 0.2 dB of matched line loss per 100 ft at 30 MHz. According to the chart in my ARRL Antenna Book, an SWR of 25:1 at the load would cause about 1.5 dB loss in 75 feet. I am using Wes's characterisation of Wireman 551. Dan's TLDETAILS prog or my online calculator ( http://www.vk1od.net/tl/tllce.php ) both use (slightly different) models derived from Wes's published measurements. I don't have the ARRL Antenna Book with me at the moment, but I suspect it is not based on the same Matched Line Loss model, and does not estimate loss from the actual reflection coefficients but from an "average SWR" model which gives an averaged loss per unit length that doesn't take account of the fact that loss is usually highest in the region of current maxima. My calculator produces a figure of 2.2 dB for your example. I haven't rechecked Dan's this morning, but it is close. Grab Dan's calculator or mine and try it out. Dan's is really neat and a stand-alone Windows app, my online calc has less graphics, doesn't display (or even calculate SWR), knows about more transmission lines, and only needs a browser to access it. I use them both. In my 100m of W551 with a 16+j0 load at 30MHz, the loss in one metre of line nearest the load is over 4%, the good news is that since 75% of the transmitter power is already lost, the weighted effect of that 4.3% is nearer 1% of tx output. ... waiting for me to forget to cross an 'i' or dot a 't'. Of course I don't, otherwise I would have mentioned ...! Did you miss the humor? Must have. 73 Owen -- |
ladderline to coax adapter
Owen Duffy wrote:
In my 100m of W551 with a 16+j0 load at 30MHz, the loss in one metre of line nearest the load is over 4%, the good news is that since 75% of the transmitter power is already lost, the weighted effect of that 4.3% is nearer 1% of tx output. What the heck is one "metre"? Netscape says that is misspelled and probably should be corrected to "metro". Why aren't you guys on the English system? If the loss in each meter is 4%, wouldn't the loss in 100 meters be 400%? What am I missing? -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
Cecil Moore wrote:
SNIPPED I once worked for Schlumberger and Texas is definitely NOT out of oil, i.e. Lots of oil is being held in reserve in cases of arrested development as it is in Florida, California, and Alaska.) Some day the Near East will figure out that USA long term policy is to devoid the Near East of oil. After that, the USA reserves in California, Oklahoma, Florida, and Alaska [Wildlife Refuge] will put the USA in a dominant and controlling position in the world economic situation. "Use Everyone's, Save Ours!!" AK |
ladderline to coax adapter
Cecil Moore wrote:
Owen Duffy wrote: In my 100m of W551 with a 16+j0 load at 30MHz, the loss in one metre of line nearest the load is over 4%, the good news is that since 75% of the transmitter power is already lost, the weighted effect of that 4.3% is nearer 1% of tx output. What the heck is one "metre"? Netscape says that is misspelled and probably should be corrected to "metro". Why aren't you guys on the English system? If the loss in each meter is 4%, wouldn't the loss in 100 meters be 400%? What am I missing? C'mon Cecil, you know it's an exponential decay. I just started reading this thread. Is the loss in a 'per meter' or 'per wavelength'? In the olden days, we quoted loss as Nepers per wavelength. When did it change to 'percent per meter'? AK |
ladderline to coax adapter
Amos Keag wrote:
Cecil Moore wrote: If the loss in each meter is 4%, wouldn't the loss in 100 meters be 400%? What am I missing? C'mon Cecil, you know it's an exponential decay. The maximum HF current point could exist in the first foot of feedline at the source. Why would the HF losses in the transmission line at the load ever be greater than at that maximum HF current point? -- 73, Cecil http://www.qsl.net/w5dxp |
ladderline to coax adapter
At the same time velocity factors were converted to furlongs per
fortnight... :) "Amos Keag" wrote in message . .. I just started reading this thread. Is the loss in a 'per meter' or 'per wavelength'? In the olden days, we quoted loss as Nepers per wavelength. When did it change to 'percent per meter'? AK |
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