Re: Topband: alternative to shunt fed tower
I am getting a paywall that says only pages 1 through 8 are free. Can't get to this article. Without reading the article, the folded cage around the tower sounds exactly like shunt feed, not an *alternative* to shunt feed. Rick N6RK On 9/16/2018 10:03 AM, N7DF via Topband wrote: In the April 1984 issue of CQ magazine is an article on how to build a folded cage monopole around a tower with yagi antennas on top You can get a copy from the CQ Magazine archives CQ Magazine Archives - April 1984 _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Use shunt fed tower
Depends upon the concrete/cement . ( Base fed vertical) Years ago, found after experimenting with out base insulators that there were definite high RF losses. (resistance went through to earth) 73 Bruce-k1fz https://www.qsl.net/k1fz/bognotes.html . On Sun, 16 Sep 2018 20:26:02 -0400, Stan wrote: Hi everybody! A couple thoughts on shunt fed towers... Depending on what you read on the web, concrete/cement might (or might not) be somewhat of a conductor. So, could attaching to concrete around the house be a help as a ground/radial? Thoughts??? Feeding a tower with NO RADIALS. It seems it would be possible to feed a tower about halfway up as a center fed vertical dipole, with no need for radials. In most cases it would be a very short dipole for Top Band, tho. Thoughts??? Sometimes weird ideas pop into my head.. Stan K8LL 10-10# 76801 FP# 3255 Propagation is our master... but sometimes the master is cruel! _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Use shunt fed tower
Hi everybody! A couple thoughts on shunt fed towers... Depending on what you read on the web, concrete/cement might (or might not) be somewhat of a conductor. So, could attaching to concrete around the house be a help as a ground/radial? Thoughts??? Feeding a tower with NO RADIALS. It seems it would be possible to feed a tower about halfway up as a center fed vertical dipole, with no need for radials. In most cases it would be a very short dipole for Top Band, tho. Thoughts??? Sometimes weird ideas pop into my head.. Stan K8LL 10-10# 76801 FP# 3255 Propagation is our master... but sometimes the master is cruel! _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: alternative to shunt fed tower
In the April 1984 issue of CQ magazine is an article on how to build a folded cage monopole around a tower with yagi antennas on top You can get a copy from the CQ Magazine archives CQ Magazine Archives - April 1984 _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Use shunt fed tower
I think the issue is not whether a vertical needs radials or not. A vertical monopole needs a ground system or a counterpoise. The ground system can be the actual ground or radials, or both, or even the shield of the coax (and your station at the end of it). If you have a good ground and it is connected via a low impedance path, you may not need any radials. (I don't use any at C6AGU, but the antenna stands in salt-water.) But if your ground is poor, you do need radials, or some other effective counterpoise. Every location is different and you should plan accordingly. It is very simple to determine whether your ground system is adequate. Model and measure your antenna. If the model indicates a feed point impedance of 25 Ohms and you measure 50 Ohms, the extra 25 Ohms is probably contributed by the (poor) ground system. (Of course it could be a poor model too.) 73, George, AA7JV On Sun, 16 Sep 2018 10:11:06 -0400 (EDT) kol...@rcn.com wrote: Well, my system here at K3OX is a "T" with a 40 ft vertical section and a 90 ft flat top. It sort of worked OK when I first put it up, but it works much more OK after about 32 random (to fit my 4 0 x 110 lot) radials were installed. It would work better yet if I had more and longer radials, and mo' better than that if the vertical section was 130 ft! So saying an antenna "works" is a relative thing. But the moral is, you do what you can. T o paraphrase Clint Eastwood, "A man's gotta know his antenna limitations". 73 Kevin K3OX - Original Message - From: "Peter Voelpel" To: topband@contesting.com Sent: Sunday, September 16, 2018 9:44:46 AM Subject: Re: Topband: Use shunt fed tower It can work and it does. I used a shunt fed tower without radials for a couple of years on the former qth just with the tower grounding. Now I feed the tower directly and against a single sloping radial, it works great and is also a better receiving antenna then my relatively short beverages. 73 Peter, DJ7WW -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of John Harden, D.M.D. Sent: Sonntag, 16. September 2018 02:43 To: daraym...@iowatelecom.net Cc: topband@contesting.com; cfytech24x7 Subject: Re: Topband: Use shunt fed tower A shunt fed tower requires radials period. It cannot work without them! 73, John, W4NU Sent from my iPhone On Sep 15, 2018, at 1:55 PM, wrote: It makes no difference how the tower is fed, a vertical antenna must have radials of some kind to be effective. 73. . .Dave, W0FLS -Original Message- From: cfytech24x7 Sent: Saturday, September 15, 2018 11:29 AM To: topband@contesting.com Subject: Topband: Use shunt fed tower A shunt fed tower is a vertical antenna so it offers lowest take off angle. Shunt feeding avoids need for radial field. Any horizontal wire antenna is going to put most of your radiated energy out at high angles, unless you can get it at least a half wavelength of height. A loop may be a quieter antenna for RX but your existing inverted Vs are no doubt better for TX. There is some art and experimentation involved in the matching but the results will be worth the effort. I would start with your highest antenna for top band, next highes for 80m. Note that your yagis will act nicely as capacitive hats to add to effective tower hight. Gl es 73, ab1vl chuck Sent from my Galaxy TabR A _ 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 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: W7YRV Roy's Increadable Antenna Farm
Hi Kevin, I do have a copy of "Don Wallace W6AM" book. Excellent reading indeed! 73, Mirko, S57AD V V ned., 16. sep. 2018 ob 16:18 je oseba napisala: > > If you want to read about the early days of DXing and another super > antenna farm, get a copy of "Don Wallace W6AM" by N6AW. Really fascinating > to read about his antenna exploits and about long deleted DX entities. And > about DXing when it was really a "savage art"... > > 73 Kevin K3OX > > > - Original Message - > > From: "Wes Stewart" > To: topband@contesting.com > Sent: Sunday, September 16, 2018 9:57:32 AM > Subject: Re: Topband: W7YRV Roy's Increadable Antenna Farm > > For more about Roy, our DX club website has additional photos of his > antenna > farm, as well as some other members' projects. > > See: http://sadxa.org/memberprojects.html > > Wes N7WS > > On 9/16/2018 1:40 AM, S57AD wrote: > > Thank you, Terry! Incredible antenna farm indeed! Enjoyed reading the > story > > and watching pics! > > > > 73, Mirko, S57AD > > > > _ > Topband Reflector Archives - http://www.contesting.com/_topband > > _ > Topband Reflector Archives - http://www.contesting.com/_topband > -- Mirko S57AD _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: W7YRV Roy's Increadable Antenna Farm
If you want to read about the early days of DXing and another super antenna farm, get a copy of "Don Wallace W6AM" by N6AW. Really fascinating to read about his antenna exploits and about long deleted DX entities. And about DXing when it was really a "savage art"... 73 Kevin K3OX - Original Message - From: "Wes Stewart" To: topband@contesting.com Sent: Sunday, September 16, 2018 9:57:32 AM Subject: Re: Topband: W7YRV Roy's Increadable Antenna Farm For more about Roy, our DX club website has additional photos of his antenna farm, as well as some other members' projects. See: http://sadxa.org/memberprojects.html Wes N7WS On 9/16/2018 1:40 AM, S57AD wrote: > Thank you, Terry! Incredible antenna farm indeed! Enjoyed reading the story > and watching pics! > > 73, Mirko, S57AD > _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Use shunt fed tower
Well, my system here at K3OX is a "T" with a 40 ft vertical section and a 90 ft flat top. It sort of worked OK when I first put it up, but it works much more OK after about 32 random (to fit my 4 0 x 110 lot) radials were installed. It would work better yet if I had more and longer radials, and mo' better than that if the vertical section was 130 ft! So saying an antenna "works" is a relative thing. But the moral is, you do what you can. T o paraphrase Clint Eastwood, "A man's gotta know his antenna limitations". 73 Kevin K3OX - Original Message - From: "Peter Voelpel" To: topband@contesting.com Sent: Sunday, September 16, 2018 9:44:46 AM Subject: Re: Topband: Use shunt fed tower It can work and it does. I used a shunt fed tower without radials for a couple of years on the former qth just with the tower grounding. Now I feed the tower directly and against a single sloping radial, it works great and is also a better receiving antenna then my relatively short beverages. 73 Peter, DJ7WW -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of John Harden, D.M.D. Sent: Sonntag, 16. September 2018 02:43 To: daraym...@iowatelecom.net Cc: topband@contesting.com; cfytech24x7 Subject: Re: Topband: Use shunt fed tower A shunt fed tower requires radials period. It cannot work without them! 73, John, W4NU Sent from my iPhone > On Sep 15, 2018, at 1:55 PM, wrote: > > It makes no difference how the tower is fed, a vertical antenna must have radials of some kind to be effective. 73. . .Dave, W0FLS > > -Original Message- From: cfytech24x7 > Sent: Saturday, September 15, 2018 11:29 AM > To: topband@contesting.com > Subject: Topband: Use shunt fed tower > > A shunt fed tower is a vertical antenna so it offers lowest take off angle. Shunt feeding avoids need for radial field. Any horizontal wire antenna is going to put most of your radiated energy out at high angles, unless you can get it at least a half wavelength of height. A loop may be a quieter antenna for RX but your existing inverted Vs are no doubt better for TX. > There is some art and experimentation involved in the matching but the results will be worth the effort. I would start with your highest antenna for top band, next highes for 80m. Note that your yagis will act nicely as capacitive hats to add to effective tower hight. > Gl es 73, ab1vl chuck > > > > > Sent from my Galaxy TabR A > _ > 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 Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: W7YRV Roy's Increadable Antenna Farm
For more about Roy, our DX club website has additional photos of his antenna farm, as well as some other members' projects. See: http://sadxa.org/memberprojects.html Wes N7WS On 9/16/2018 1:40 AM, S57AD wrote: Thank you, Terry! Incredible antenna farm indeed! Enjoyed reading the story and watching pics! 73, Mirko, S57AD _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Use shunt fed tower
It can work and it does. I used a shunt fed tower without radials for a couple of years on the former qth just with the tower grounding. Now I feed the tower directly and against a single sloping radial, it works great and is also a better receiving antenna then my relatively short beverages. 73 Peter, DJ7WW -Original Message- From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of John Harden, D.M.D. Sent: Sonntag, 16. September 2018 02:43 To: daraym...@iowatelecom.net Cc: topband@contesting.com; cfytech24x7 Subject: Re: Topband: Use shunt fed tower A shunt fed tower requires radials period. It cannot work without them! 73, John, W4NU Sent from my iPhone > On Sep 15, 2018, at 1:55 PM, wrote: > > It makes no difference how the tower is fed, a vertical antenna must have radials of some kind to be effective. 73. . .Dave, W0FLS > > -Original Message- From: cfytech24x7 > Sent: Saturday, September 15, 2018 11:29 AM > To: topband@contesting.com > Subject: Topband: Use shunt fed tower > > A shunt fed tower is a vertical antenna so it offers lowest take off angle. Shunt feeding avoids need for radial field. Any horizontal wire antenna is going to put most of your radiated energy out at high angles, unless you can get it at least a half wavelength of height. A loop may be a quieter antenna for RX but your existing inverted Vs are no doubt better for TX. > There is some art and experimentation involved in the matching but the results will be worth the effort. I would start with your highest antenna for top band, next highes for 80m. Note that your yagis will act nicely as capacitive hats to add to effective tower hight. > Gl es 73, ab1vl chuck > > > > > Sent from my Galaxy TabR A > _ > 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 Reflector Archives - http://www.contesting.com/_topband
Topband: Any North American activity?
I came on before our Sunrise this Sunday morning at 04.30Z, calling CQ DX, and continued for half an hour. There were several other regular EU Dx-ers on too, calling. I didn't hear any NA stations . . . and didn't hear anyone else work any. Were conditions bad? Or just a lack of activity? Roger G3YRO _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: W7YRV Roy's Increadable Antenna Farm
Thank you, Terry! Incredible antenna farm indeed! Enjoyed reading the story and watching pics! 73, Mirko, S57AD V V ned., 16. sep. 2018 ob 10:37 je oseba terry burge napisala: > Oh, of course even checking my email before sending I messed up! Let's try > again. > > The link is www.w7yrv.blogspot.com > Sorry about that. > Terry > > On September 16, 2018 at 1:27 AM S57AD wrote: > > > > > > And where the link is? I'm all ears :) > > > > 73, Mirko, S57AD > > > > V V ned., 16. sep. 2018 ob 10:21 je oseba terry burge > > napisala: > > > > > Hi Gang, > > > > > > > > > I'm going to share a link I found a few years back that just amazed me. > > > Still does. Ever think that can't be done? Well take a look at what Roy > > > Callison built over the years and the techniques he use. I know I > would not > > > have the nerve but just seeing what he could do is something and gave > me > > > some ideas! > > > > > > > > > And it is all about building an antenna farm to beat all others. I > think > > > he probably did it. > > > > > > > > > Terry > > > > > > KI7M > > > > > > _ > > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > > > > > > -- > > Mirko S57AD > > _ > > Topband Reflector Archives - http://www.contesting.com/_topband > -- Mirko S57AD _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: W7YRV Roy's Increadable Antenna Farm
Oh, of course even checking my email before sending I messed up! Let's try again. The link is www.w7yrv.blogspot.com Sorry about that. Terry > On September 16, 2018 at 1:27 AM S57AD wrote: > > > And where the link is? I'm all ears :) > > 73, Mirko, S57AD > > V V ned., 16. sep. 2018 ob 10:21 je oseba terry burge > napisala: > > > Hi Gang, > > > > > > I'm going to share a link I found a few years back that just amazed me. > > Still does. Ever think that can't be done? Well take a look at what Roy > > Callison built over the years and the techniques he use. I know I would not > > have the nerve but just seeing what he could do is something and gave me > > some ideas! > > > > > > And it is all about building an antenna farm to beat all others. I think > > he probably did it. > > > > > > Terry > > > > KI7M > > > > _ > > Topband Reflector Archives - http://www.contesting.com/_topband > > > > > -- > Mirko S57AD > _ > Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: W7YRV Roy's Increadable Antenna Farm
And where the link is? I'm all ears :) 73, Mirko, S57AD V V ned., 16. sep. 2018 ob 10:21 je oseba terry burge napisala: > Hi Gang, > > > I'm going to share a link I found a few years back that just amazed me. > Still does. Ever think that can't be done? Well take a look at what Roy > Callison built over the years and the techniques he use. I know I would not > have the nerve but just seeing what he could do is something and gave me > some ideas! > > > And it is all about building an antenna farm to beat all others. I think > he probably did it. > > > Terry > > KI7M > > _ > Topband Reflector Archives - http://www.contesting.com/_topband > -- Mirko S57AD _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: W7YRV Roy's Increadable Antenna Farm
Hi Gang, I'm going to share a link I found a few years back that just amazed me. Still does. Ever think that can't be done? Well take a look at what Roy Callison built over the years and the techniques he use. I know I would not have the nerve but just seeing what he could do is something and gave me some ideas! And it is all about building an antenna farm to beat all others. I think he probably did it. Terry KI7M _ Topband Reflector Archives - http://www.contesting.com/_topband
