Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
On Thu, Jan 23, 2014 at 8:00 PM, Richard Fry r...@adams.net wrote: Note that the NEC4.2 analysis I generated and linked at http://s20.postimg.org/6hfsl64ml/Elevated_vs_Buried_Radials.jpg closely replicates the measured results of a real-world monopole system elevated 4.9 meters above the earth. That's interesting because the presentation shows the max of the four elevated at *minus* 1.17, while the buried radials are minus 0.71. That means the 4 elevated are about a half dB inferior to dense buried. Did you run that four elevated model setup with the buried radials in place, but not connected to the feedpoint, just floating, or was it just four elevated over plain ground. What were the ground constants in use when you ran the models? When you say closely replicates, are you comparing the models' groundwave display to field strength measurements at ground? 73, Guy. _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
A response to David Raymond's questions on elevated monopole systems was posted to the listserver on Jan 22, 2014 (link below). http://lists.contesting.com/archives//html/Topband/2014-01/msg00189.html _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
Guy Olinger wrote: ...the presentation shows the max of the four elevated at *minus* 1.17, while the buried radials are minus 0.71. That means the 4 elevated are about a half dB inferior to dense buried. The text of my post first including the URL for my NEC study (link below) stated that there was about 0.5 dB difference between them because I hadn't taken the time to trim the monopoles heights slightly to produce identical results. But that wasn't necessary to make the point that the system with elevated radials installed over poor earth having no buried radials in it has essentially the same performance as the system using 120 x 1/4-wave radials (only), buried in that same earth. Did you run that four elevated model setup with the buried radials in place, but not connected to the feedpoint, just floating, or was it just four elevated over plain ground. The elevated system was comprised of five conductors, only: the vertical monopole and the four horizontal radials -- as per the wire model shown as an inset in the elevation pattern for the elevated system in my graphic. That elevated system has no metallic connection to the earth, and no other metallic conductors in the model. What were the ground constants in use when you ran the models? As stated in my earlier post linked below, and also in large letters at the top of my NEC study page, it was 1 mS/m, d.c. 5. When you say closely replicates, are you comparing the models' groundwave display to field strength measurements at ground? The inverse distance field intensity for 1 kW of applied power at a distance of 1 km determined by the consultant for WPCI's elevated system closely replicates the inverse distance field expected by the FCC for a 1/4-wave monopole driven against 120 x 1/4-wave buried radials (302 mVm and 307 mV/m, respectively). A perfect 1/4-wave monopole driven against a perfect ground plane produces about 313.6 mV/m at 1 km for 1 kW of applied power. My NEC study shows that the peak gain and radiation pattern of the two systems compared essentially are duplicates. Equal antenna system gains produce equal fields at a given distance, for a given applied power. Note that the basic information needed to answer the questions shown above already was included in my earlier posts. http://lists.contesting.com/archives//html/Topband/2014-01/msg00202.html R. Fry _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: End of a bias tee adventure?
After making all of the recommended changes, I hooked up my MFJ and got 650 readings regardless. When connected to a 75 ohm dummy load, it reads completely normally, as does shorting the input (R=0_ If I had managed to damage the MFJ with DC voltage on the input, would you expect no readings at all (650 everywhere)? -- 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com. For spots, please go to your favorite ARC V6 or VE7CC DX cluster node. _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: End of a bias tee adventure?
Years ago when I did in my MFJ meter, 50 ohms was reading 40 ohms. It was a real chore to change out the bad diode and calibrate. 73 Bruce-K1FZ www.qsl.net/k1fz/pennantnotes.html - Original Message - From: Pete Smith N4ZR n...@contesting.com To: topband reflector Topband@contesting.com Sent: Friday, January 24, 2014 9:57 AM Subject: Topband: End of a bias tee adventure? After making all of the recommended changes, I hooked up my MFJ and got 650 readings regardless. When connected to a 75 ohm dummy load, it reads completely normally, as does shorting the input (R=0_ If I had managed to damage the MFJ with DC voltage on the input, would you expect no readings at all (650 everywhere)? -- 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com. For spots, please go to your favorite ARC V6 or VE7CC DX cluster node. _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: End of a bias tee adventure?
From my notes, it was diode D3. (May not always be the same) I got the calibration info from a W8JI WEB site posting. http://www.w8ji.com/mfj-259b_calibration.htm 73 Bruce-K1FZ www.qsl.net/k1fz/beveragenotes.html - Original Message - From: Hardy Landskov n...@cox.net To: Bruce k...@myfairpoint.net Sent: Friday, January 24, 2014 11:16 AM Subject: Re: Topband: End of a bias tee adventure? I would like to know which diode because mine is doing the same thing. There is nothing in the manual on how to calibrate it either. 73 Hardy N7RT - Original Message - From: Bruce k...@myfairpoint.net To: Pete Smith N4ZR n...@contesting.com; topband reflector Topband@contesting.com Sent: Friday, January 24, 2014 8:49 AM Subject: Re: Topband: End of a bias tee adventure? Years ago when I did in my MFJ meter, 50 ohms was reading 40 ohms. It was a real chore to change out the bad diode and calibrate. 73 Bruce-K1FZ www.qsl.net/k1fz/pennantnotes.html - Original Message - From: Pete Smith N4ZR n...@contesting.com To: topband reflector Topband@contesting.com Sent: Friday, January 24, 2014 9:57 AM Subject: Topband: End of a bias tee adventure? After making all of the recommended changes, I hooked up my MFJ and got 650 readings regardless. When connected to a 75 ohm dummy load, it reads completely normally, as does shorting the input (R=0_ If I had managed to damage the MFJ with DC voltage on the input, would you expect no readings at all (650 everywhere)? -- 73, Pete N4ZR Check out the Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com. For spots, please go to your favorite ARC V6 or VE7CC DX cluster node. _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: End of a bias tee adventure?
I would like to know where to get those diodes! Right after I bought my last MFJ-259B, I e-mailed MFJ about buying a spare or two just in case. They never replied. Anyone have a Mfg. name and P/N? 73, Mike www.w0btu.com On Fri, Jan 24, 2014 at 9:49 AM, Bruce k...@myfairpoint.net wrote: Years ago when I did in my MFJ meter, 50 ohms was reading 40 ohms. It was a real chore to change out the bad diode and calibrate. _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: OH0Z ON THE AIR
This morning OH0Z was very readable in EN93 from around 1205Z to about 1235Z but the guys further west and south must really have had a good path as they made it into the log in good numbers. I hope propagation favours us a bit further north and east in the next few daysI need that one! Bill, VE3CSK _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: One of those times
Conditions have been very poor to say the least from KH6 land especially to EU. What few contacts I have made have been from a very skewed western direction. Today was no different, path over the pole at sunrise was not open, I was sitting on 1823 working on email, sunrise is 1708Z and suddenly I could hear a signal starting to come out of the noise. ???BM 8???BM then clear as a bell 8Q7BM calling cq. One call and I had a new one in the log at 1710Z, he then faded back down into the noise, I could hear traces of him for another 20 mins after sunrise, not enough to copy but knew he was there. Just one of those top band times when being at the right place at the right time when the band sounds dead. Makes up for all the ones I have missed this season. 73 Merv K9FD/KH6 _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: One of those times
Fantastic catch Merv I am sure that made your day! Rich K7ZV Conditions have been very poor to say the least from KH6 land especially to EU. What few contacts I have made have been from a very skewed western direction. Today was no different, path over the pole at sunrise was not open, I was sitting on 1823 working on email, sunrise is 1708Z and suddenly I could hear a signal starting to come out of the noise. ???BM 8???BM then clear as a bell 8Q7BM calling cq. One call and I had a new one in the log at 1710Z, he then faded back down into the noise, I could hear traces of him for another 20 mins after sunrise, not enough to copy but knew he was there. Just one of those top band times when being at the right place at the right time when the band sounds dead. Makes up for all the ones I have missed this season. 73 Merv K9FD/KH6 _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: One of those times
FB! Merv! Reminds me of years ago, when I worked Jacky, 3B8CF from here in NC on the very first antenna that I ever built for 160 - an inverted L! Seemed that I was the only one hearing him, although, Jack, N4JJ jumped in and worked him right after me! There's a lot to be said for lots of LISTENING! It seems to me that it's a lot like fishing! How much we catch depends a lot on our time on the water! (Too many, I think, want to be spoon-fed DX on packet clusters and internet!) You were there LISTENING when he showed up! FB! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Merv Schweigert Sent: Friday, January 24, 2014 2:14 PM To: topband@contesting.com Subject: Topband: One of those times Conditions have been very poor to say the least from KH6 land especially to EU. What few contacts I have made have been from a very skewed western direction. Today was no different, path over the pole at sunrise was not open, I was sitting on 1823 working on email, sunrise is 1708Z and suddenly I could hear a signal starting to come out of the noise. ???BM 8???BM then clear as a bell 8Q7BM calling cq. One call and I had a new one in the log at 1710Z, he then faded back down into the noise, I could hear traces of him for another 20 mins after sunrise, not enough to copy but knew he was there. Just one of those top band times when being at the right place at the right time when the band sounds dead. Makes up for all the ones I have missed this season. 73 Merv K9FD/KH6 _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: One of those times
BTW - that was just before my sunset! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Charlie Cunningham Sent: Friday, January 24, 2014 2:32 PM To: 'Merv Schweigert'; topband@contesting.com Subject: Re: Topband: One of those times FB! Merv! Reminds me of years ago, when I worked Jacky, 3B8CF from here in NC on the very first antenna that I ever built for 160 - an inverted L! Seemed that I was the only one hearing him, although, Jack, N4JJ jumped in and worked him right after me! There's a lot to be said for lots of LISTENING! It seems to me that it's a lot like fishing! How much we catch depends a lot on our time on the water! (Too many, I think, want to be spoon-fed DX on packet clusters and internet!) You were there LISTENING when he showed up! FB! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Merv Schweigert Sent: Friday, January 24, 2014 2:14 PM To: topband@contesting.com Subject: Topband: One of those times Conditions have been very poor to say the least from KH6 land especially to EU. What few contacts I have made have been from a very skewed western direction. Today was no different, path over the pole at sunrise was not open, I was sitting on 1823 working on email, sunrise is 1708Z and suddenly I could hear a signal starting to come out of the noise. ???BM 8???BM then clear as a bell 8Q7BM calling cq. One call and I had a new one in the log at 1710Z, he then faded back down into the noise, I could hear traces of him for another 20 mins after sunrise, not enough to copy but knew he was there. Just one of those top band times when being at the right place at the right time when the band sounds dead. Makes up for all the ones I have missed this season. 73 Merv K9FD/KH6 _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: NH0Z
Of course you all knew I meant NH0Z and not OH0Z! Brain cramp. Bill VE3CSK _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: One of those times
On 01/24/2014 02:14 PM, Merv Schweigert wrote: Conditions have been very poor to say the least from KH6 land especially to EU. What few contacts I have made have been from a very skewed western direction. Today was no different, path over the pole at sunrise was not open, I was sitting on 1823 working on email, sunrise is 1708Z and suddenly I could hear a signal starting to come out of the noise. ???BM 8???BM then clear as a bell 8Q7BM calling cq. One call and I had a new one in the log at 1710Z, he then faded back down into the noise, I could hear traces of him for another 20 mins after sunrise, not enough to copy but knew he was there. Just one of those top band times when being at the right place at the right time when the band sounds dead. Makes up for all the ones I have missed this season. 73 Merv K9FD/KH6 Hi, Some people sneer at me when I mention the propagation faeries playing but this is just more evidence to support my theories grin 73, Bill KU8H _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: End of a bias tee adventure?
Is no one going to suggest that a ³gyrator² should be put into the circuit instead of an inductor? There was a W3 who had some of the diodes for replacements. They are surface mount and small! Obviously, one wants them to have a very low conduction threshold voltage. I suspect Tom can suggest some diode choices that will work. Tod, K0TO On 1/24/14, 11:41 AM, Mike Waters mikew...@gmail.com wrote: I would like to know where to get those diodes! Right after I bought my last MFJ-259B, I e-mailed MFJ about buying a spare or two just in case. They never replied. Anyone have a Mfg. name and P/N? 73, Mike www.w0btu.com On Fri, Jan 24, 2014 at 9:49 AM, Bruce k...@myfairpoint.net wrote: Years ago when I did in my MFJ meter, 50 ohms was reading 40 ohms. It was a real chore to change out the bad diode and calibrate. _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
On Fri, Jan 24, 2014 at 7:07 AM, Richard Fry r...@adams.net wrote: But that wasn't necessary to make the point that the system with elevated radials installed over poor earth having no buried radials in it has essentially the same performance as the system using 120 x 1/4-wave radials (only), buried in that same earth. ...essentially the same... A scientific definition of that would be interesting. My impression is that I am highly unappreciated by certain folks when I use such terms. An additional half dB loss in the antenna system is a permanent 12% increase in the power bill for the transmitter if one is required to maintain specified field strength. To a station manager that's probably an entirely unsatisfactory increase in moolah drain. With a 10 or 50 kW station, that's a *killer* difference. He would not use the term essentially the same. For some restricted ham situations being down only 1.5 dB from a commercial method reference could easily be as good as is possible, and only 0.5 dB would be wonderful. But for the science, 0.5 dB is simply 0.5 dB, and worthy of accounting. A 0.5 dB here and a 0.5 dB there, and 0.5 dB elsewhere starts to add up to barely catching some DX otherwise not had. And a confirmation is a confirmation. Run the four elevated over the radial field. The buzz I hear on the grapevine about 4 elevated is that's the remedy for a radial field gone sour, of course leaving the old radials *retired in place*. Trying to disprove experience in non-commercial small lot situations by referring to NEC 4.x model runs from the the middle of the commercial MF BC paradigm just won't cut it. I have already stipulated many times that NEC 4 is calibrated for that paradigm and seemingly delivers well documented good results. In the same manner, you can't prove distant low and sky-wave patterns by measuring at the ground or only locally. The small lot experience is that losses to ground are underestimated by NEC 4.x, the underestimation an opinion notably shared by Roy Lewallen, W7EL, author of the respected EZNEC series of NEC shells, who has spent some serious time chasing the issue. I have gone to using .0002,1 (ghastly ground) as ground characteristics for testing model changes for ground sensitivity, giving the worst possible results for non-dense-radial counterpoise designs. This is used for comparing a before model to an after model, with wire or counterpoise changes. This accentuates changes in results due to the way ground is induced. Picking solutions with the least sensitivity to ghastly earth, again and again brings happy results in real world applications which are borne out in RBN changes. While one might think ghastly earth is too severe, difficult urban and concrete-asphalt-ish small lot situations sometimes seem even worse, pointing to some mechanism in play that is unbookept in NEC ground treatment, or possibly undiscovered. Since the NEC ground method is both monolithic characteristics and for essential reasons confined to ground *approximations*, this is really not surprising. 73, Guy. _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
I'd like to understand how NEC 4 achieves this calibration for MW BC ground systems. Do others share this concern? What errors are introduced for other analysis as a result? Grant KZ1W On 1/24/2014 1:58 PM, Guy Olinger K2AV wrote: I have already stipulated many times that NEC 4 is calibrated for that paradigm _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: End of a bias tee adventure?
After making all of the recommended changes, I hooked up my MFJ and got 650 readings regardless. When connected to a 75 ohm dummy load, it reads completely normally, as does shorting the input (R=0_ If I had managed to damage the MFJ with DC voltage on the input, would you expect no readings at all (650 everywhere)? I hooked up my MFJ and got 650 readings regardless is too vague, Pete. What was the test condition where you got 650, and 650 what?? Z? _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: One of those times
Yes one thing for sure, its a lot nicer and easier to work em when the click and call crowd does not even know they are on. I am on every day from somewhere around 1430 to 1700 and spend 99 percent of the time listening. Sometimes thats not good as the band is open and no one is transmitting, so it takes a mix of some cqs and lots of listening, Gives me some hope for FT5Z.. almost same direction and distance. 73 Merv FB! Merv! Reminds me of years ago, when I worked Jacky, 3B8CF from here in NC on the very first antenna that I ever built for 160 - an inverted L! Seemed that I was the only one hearing him, although, Jack, N4JJ jumped in and worked him right after me! There's a lot to be said for lots of LISTENING! It seems to me that it's a lot like fishing! How much we catch depends a lot on our time on the water! (Too many, I think, want to be spoon-fed DX on packet clusters and internet!) You were there LISTENING when he showed up! FB! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Merv Schweigert Sent: Friday, January 24, 2014 2:14 PM To: topband@contesting.com Subject: Topband: One of those times Conditions have been very poor to say the least from KH6 land especially to EU. What few contacts I have made have been from a very skewed western direction. Today was no different, path over the pole at sunrise was not open, I was sitting on 1823 working on email, sunrise is 1708Z and suddenly I could hear a signal starting to come out of the noise. ???BM 8???BM then clear as a bell 8Q7BM calling cq. One call and I had a new one in the log at 1710Z, he then faded back down into the noise, I could hear traces of him for another 20 mins after sunrise, not enough to copy but knew he was there. Just one of those top band times when being at the right place at the right time when the band sounds dead. Makes up for all the ones I have missed this season. 73 Merv K9FD/KH6 _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband . _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
Guy Olinger postulated for a while, then wrote: ... Run the four elevated over the radial field. ... You posted that you have NEC4, Mr Olinger. Why not do that yourself then, rather than ask someone else to do it for you? Post your results and the bases for them, as I have done for my NEC4 analysis. Your credibility will improve if your accurate NEC model results show that the radiation efficiency of a vertical monopole using four, elevated, 1/4-wave radials when installed concentric with even a perfect set of 120 x 1/4-wave buried radials is significantly better than if those buried radials were not present (other parameters the same). Let us define significant as differing by more than 0.5 dB. The buzz I hear on the grapevine about 4 elevated is that's the remedy for a radial field gone sour, of course leaving the old radials *retired in place*. The grapevine buzz you report about this subject is not worth further dissemination, as no defensible documentation is available to support its accuracy. In any case, monopoles using only several, elevated, 1/4-wave radials have been used by AM broadcast stations where it was impossible/impractical to install ANY buried radials -- and those systems performed nearly as well as if they were driven against a set of 120 x 1/4-wave buried radials (as I posted previously) -- and they met/exceeded the FCC's minimum efficiency requirements for those AM broadcast antenna systems for that class of service. There is no scientific reason why that same result would not apply to ham operators with monopoles on the 160-meter band using ONLY several, elevated, 1/4-wave radials. Or possibly even to those hams using monopoles with only an FCP. R. Fry _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Anyone purchased the ARRL book on Short Antennas for160???
Well, it seems to me, that something that is being overlooked in this discussion, is that for, many of us, buried radials are not an option. In my case, I have bedrock that comes pretty much right up to the surface on much of my lot that's available for antennas, and I have a long concrete driveway, that runs pretty much the full length of my lot to a detached garage that's near my small tower. The point is, that many of us without large amounts of funds or real estate, simply have to accept the reality of our situation and, work with what we have, and try to flower where we're planted. In my case I've worked lots of pretty good DX on all continents and in all the oceans with an inverted L about 75 feet tall and supported by a tall tulip poplar and had two elevated resonant radials, diametrically opposed just above the level of the fence line around my small urban lot here in Raleigh, NC and never more than 500 -600 watts. Some examples on 160, are 3B8, JA, VK, ZL, VK6, ZS6, ZD9.S79, KL7.KH6 ( many) KH5, KH5K, KH7K, KH2, T32 , FO0, LOTs of Europeans. quite a few Africans, Lots of South America, of course. I should point out that from Raleigh, NC VK6 is pretty close to being the antipode. - And I wasn't a SERIOUS 160m op. I was mostly chasing DX on 40 m and working everything that was around on as many bands as possible with my killer 5-band quad. Worked everything on the DXCC country list on CW except for North Korea. But generally, on 160, if I could HEAR 'em, I could work 'em! Biggest problem was hearing!! But the addition of a couple of 40' X 10' KAZ terminated receiving loops helped a LOT!! - a LOT more than another 0.5 DB of TX antenna gain would have afforded. As I said, if I could hear 'em, I could work 'em! An additional 0.5 or 1.0 DB on TX wouldn't have made much difference! And I had fun!! There's a lot to be said for listening a LOT - for catching the DX when they come up and working 'em before the packet-rats show up! In other words, try to be there when and where the competition ain't! And BTW 160 doesn't die in our summer - when it's winter in the Southern hemisphere. There's a lot available on Topband in summer. Just have to listen a lot! Especially in our mornings before and after our sunrise before a lot of the QRN from the T-storms picks up! A lt of VKs, ZLs etc. available then! FWIW! Good huntn' 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Richard Fry Sent: Friday, January 24, 2014 7:26 PM To: topband@contesting.com Subject: Re: Topband: Anyone purchased the ARRL book on Short Antennas for160??? Guy Olinger postulated for a while, then wrote: ... Run the four elevated over the radial field. ... You posted that you have NEC4, Mr Olinger. Why not do that yourself then, rather than ask someone else to do it for you? Post your results and the bases for them, as I have done for my NEC4 analysis. Your credibility will improve if your accurate NEC model results show that the radiation efficiency of a vertical monopole using four, elevated, 1/4-wave radials when installed concentric with even a perfect set of 120 x 1/4-wave buried radials is significantly better than if those buried radials were not present (other parameters the same). Let us define significant as differing by more than 0.5 dB. The buzz I hear on the grapevine about 4 elevated is that's the remedy for a radial field gone sour, of course leaving the old radials *retired in place*. The grapevine buzz you report about this subject is not worth further dissemination, as no defensible documentation is available to support its accuracy. In any case, monopoles using only several, elevated, 1/4-wave radials have been used by AM broadcast stations where it was impossible/impractical to install ANY buried radials -- and those systems performed nearly as well as if they were driven against a set of 120 x 1/4-wave buried radials (as I posted previously) -- and they met/exceeded the FCC's minimum efficiency requirements for those AM broadcast antenna systems for that class of service. There is no scientific reason why that same result would not apply to ham operators with monopoles on the 160-meter band using ONLY several, elevated, 1/4-wave radials. Or possibly even to those hams using monopoles with only an FCP. R. Fry _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: WAS 160 mts
WOW! FB!, Jorge! That's quite an accomplishment!! Especially from where you are!! 73, Charlie, K4OTV -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Jorge Diez - CX6VM Sent: Friday, January 24, 2014 11:46 PM To: topband@contesting.com Subject: Topband: WAS 160 mts Hello Nice to found today my last LOTW confirmation for WAS LOTW on topband Jack WA7LNW confirmed Utah for the last one. A 2012 QSO that finally was confirmed. Thanks all for the QSO´s! 73, Jorge CX6VM/CW5W _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
