Re: Topband: Ideas for xmit antennas for new QTH in KH6
OKfine! From there attach a Dacron rope to support a Lazy Inverted L or sloper that is started some distance away from the tower to minimize interaction, and feed it with 50 ohm coax against a few radial. You can even drop a wire for 80 meters from the same halyard and use the same feed connection. Both the 160 and 80 wires should be slightly longer than 1/4 wave so two different series capacitors can be used as may be required. If the 160 and 80 drop wires are 20 feet or more apart you should be able to use the same feed line without any serious problem. The radial you use for 160 work just a good for 80 and of they are insulated wire laying on the ground need not be a quarter wave and can be 20 to 30% shorter than normal. Herb Schoenbohm, KV4FZ On 12/9/2015 9:12 PM, cqtestk...@aol.com wrote: *Yes, at 80 ft.* In a message dated 12/9/2015 10:43:27 P.M. Coordinated Universal Tim, he...@vitelcom.net writes: Is there anyway you can put a slip ring to support a T antenna (Marconi) for 160 and 80 at some height that won't snag the beam elements? Herb, KV4FZ On 12/9/2015 6:34 PM, Cqtestk4xs--- via Topband wrote: > Next year I'll be building a new home and station in Hawaii. > > 40 through 6 meters is already set in stone, but 80 and 160 are still > cloudy. > > Here's the setup: > > I'm allowed one tower maximum 90 ft. The tower will be 90 ft of Rohn 55 > using a K0XG rotating system with two rings. It will be guyed using > fiberglass guys. There will be a bunch of HF VHF stuff on the tower. Three > tribanders, two 12/17 meter Yagis, a 40 meter Yagi and way down on the bottom > two 6 meter antennas. > > The tower sits on VERY uneven ground. Although the lot measures 12 > acres, I am using only the top three and renting out the rest of the land to a > farmer to keep taxes from being crazy high. > > The ground is pure alluvial red fine particle soil (no stones) and has a > depth of about 6 feet before hitting rock. Since the east side of Hawaii > gets at least 100 inches of rain a year it is usually pretty moist. I would > assume the soil is at least average or better in conductivity. I can run > ropes, wires etc off the tower at the 80 and 40 foot guy points, but can not > connect directly to the tower since the tower rotates. The is no room for > a rotating dipole on the tower for 80. > > I've used quad triangle loops before with the pointed end on the bottom > suspended by wires and am leaning towards that since the ground is so uneven > and the terrain difference would be a real negative for a 4 square (I > think). > > On 160 I'm leaning toward a wire vertical suspended from a rope coming > from the tower which would make the antenna about 65 or 70 feet tall and to > compensate for that I would make it a T-top. > > For rx I have lots of room to run a 700 -900 Beverage to JA and another to > EU/USA direction, so that isn't a problem. > > I do need suggestions for my 80 and 160 tx situation. Any ideas? > _ > 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: Ideas for xmit antennas for new QTH in KH6
Hi, Read this article written by Rudy, N6LF: http://rudys.typepad.com/ant/files/antenna_array_single_support.pdf Maybe you can find your solution. GL, 73Douglas, CO8DM / T49A Founder of T48K "No creo que haya alguna emoción más intensa para un inventor que ver alguna de sus creaciones funcionando. Esa emoción hace que uno se olvide de comer, de dormir, de todo." - Nikola Tesla - Original Message - From: "Cqtestk4xs--- via Topband" To: Sent: Wednesday, December 09, 2015 5:34 PM Subject: Topband: Ideas for xmit antennas for new QTH in KH6 Next year I'll be building a new home and station in Hawaii. 40 through 6 meters is already set in stone, but 80 and 160 are still cloudy. Here's the setup: I'm allowed one tower maximum 90 ft. The tower will be 90 ft of Rohn 55 using a K0XG rotating system with two rings. It will be guyed using fiberglass guys. There will be a bunch of HF VHF stuff on the tower. Three tribanders, two 12/17 meter Yagis, a 40 meter Yagi and way down on the bottom two 6 meter antennas. The tower sits on VERY uneven ground. Although the lot measures 12 acres, I am using only the top three and renting out the rest of the land to a farmer to keep taxes from being crazy high. The ground is pure alluvial red fine particle soil (no stones) and has a depth of about 6 feet before hitting rock. Since the east side of Hawaii gets at least 100 inches of rain a year it is usually pretty moist. I would assume the soil is at least average or better in conductivity. I can run ropes, wires etc off the tower at the 80 and 40 foot guy points, but can not connect directly to the tower since the tower rotates. The is no room for a rotating dipole on the tower for 80. I've used quad triangle loops before with the pointed end on the bottom suspended by wires and am leaning towards that since the ground is so uneven and the terrain difference would be a real negative for a 4 square (I think). On 160 I'm leaning toward a wire vertical suspended from a rope coming from the tower which would make the antenna about 65 or 70 feet tall and to compensate for that I would make it a T-top. For rx I have lots of room to run a 700 -900 Beverage to JA and another to EU/USA direction, so that isn't a problem. I do need suggestions for my 80 and 160 tx situation. Any ideas? _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Ideas for xmit antennas for new QTH in KH6
On 12/9/2015 2:34 PM, Cqtestk4xs--- via Topband wrote: On 160 I'm leaning toward a wire vertical suspended from a rope coming from the tower which would make the antenna about 65 or 70 feet tall and to compensate for that I would make it a T-top. Normally, a T-top is great, but in your case it will royally screw up the patterns of the higher frequency Yagi's. What were you thinking?? I think this will work, but you need to model it: Build a cage around the tower suspended from the non rotating part of the guy rings. The cage should be electrically insulated from the lower guy ring. For the top ring, there are two possibilities: Case 1: if the ring is inherently electrically conductive between rotor and stator, use it to electrically connect the cage to the tower at the upper guy ring. Case 2: If the ring is inherently electrically insulating, just let the top of the cage float. In either case the bottom of the cage is insulated from ground and is what you drive against your radials. Case 1 is the classic skirt method of shunt feeding a grounded tower. Case 2 uses the cage as the vertical and I think it will work in spite of the tower and antennas above it, but you need to model. In case 2, there may be a way to get an electrical connection across the guy ring by hanging some wires loosely from a few feet above it on the tower, such that the wires have enough slack to allow the tower to rotate. Alternately, there may be a way to let the wires hang down in a U shape. Comments? Rick N6RK _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Ideas for xmit antennas for new QTH in KH6
You guys have inspired me. I am going to try the same thing. I have toyed with the idea of a T-top and will try it too.Please give feedback on how it goes, I will too. Bob K6UJ On 12/9/15 4:52 PM, Jim Brown wrote: On Wed,12/9/2015 2:34 PM, Cqtestk4xs--- via Topband wrote: On 160 I'm leaning toward a wire vertical suspended from a rope coming from the tower which would make the antenna about 65 or 70 feet tall and to compensate for that I would make it a T-top. I like that idea, Bill. Also, if you can think of a way to do it, consider wires insulated from the tower, sloping away from it, and fed from the base against radials or folded counterpoise. If you can elevate that radials at least 20 ft, you can get away with 4-8 per wire. Add radials to the tower and it will act as a passive reflector, giving you a couple of dB in the direction of the slope. Also look at the several arrays of sloping wires in ARRL antenna publications. As I recall, there's at least one in the ON4UN book. 73, Jim K9YC _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Ideas for xmit antennas for new QTH in KH6
On Wed,12/9/2015 2:34 PM, Cqtestk4xs--- via Topband wrote: On 160 I'm leaning toward a wire vertical suspended from a rope coming from the tower which would make the antenna about 65 or 70 feet tall and to compensate for that I would make it a T-top. I like that idea, Bill. Also, if you can think of a way to do it, consider wires insulated from the tower, sloping away from it, and fed from the base against radials or folded counterpoise. If you can elevate that radials at least 20 ft, you can get away with 4-8 per wire. Add radials to the tower and it will act as a passive reflector, giving you a couple of dB in the direction of the slope. Also look at the several arrays of sloping wires in ARRL antenna publications. As I recall, there's at least one in the ON4UN book. 73, Jim K9YC _ Topband Reflector Archives - http://www.contesting.com/_topband
Re: Topband: Ideas for xmit antennas for new QTH in KH6
Is there anyway you can put a slip ring to support a T antenna (Marconi) for 160 and 80 at some height that won't snag the beam elements? Herb, KV4FZ On 12/9/2015 6:34 PM, Cqtestk4xs--- via Topband wrote: Next year I'll be building a new home and station in Hawaii. 40 through 6 meters is already set in stone, but 80 and 160 are still cloudy. Here's the setup: I'm allowed one tower maximum 90 ft. The tower will be 90 ft of Rohn 55 using a K0XG rotating system with two rings. It will be guyed using fiberglass guys. There will be a bunch of HF VHF stuff on the tower. Three tribanders, two 12/17 meter Yagis, a 40 meter Yagi and way down on the bottom two 6 meter antennas. The tower sits on VERY uneven ground. Although the lot measures 12 acres, I am using only the top three and renting out the rest of the land to a farmer to keep taxes from being crazy high. The ground is pure alluvial red fine particle soil (no stones) and has a depth of about 6 feet before hitting rock. Since the east side of Hawaii gets at least 100 inches of rain a year it is usually pretty moist. I would assume the soil is at least average or better in conductivity. I can run ropes, wires etc off the tower at the 80 and 40 foot guy points, but can not connect directly to the tower since the tower rotates. The is no room for a rotating dipole on the tower for 80. I've used quad triangle loops before with the pointed end on the bottom suspended by wires and am leaning towards that since the ground is so uneven and the terrain difference would be a real negative for a 4 square (I think). On 160 I'm leaning toward a wire vertical suspended from a rope coming from the tower which would make the antenna about 65 or 70 feet tall and to compensate for that I would make it a T-top. For rx I have lots of room to run a 700 -900 Beverage to JA and another to EU/USA direction, so that isn't a problem. I do need suggestions for my 80 and 160 tx situation. Any ideas? _ Topband Reflector Archives - http://www.contesting.com/_topband _ Topband Reflector Archives - http://www.contesting.com/_topband
