|
Apparently, due to a design flaw in the original model, you can easily burn
out the 20 meter trap by running legal power. I destroyed mine running 600 watts, and another ham burned his out doing the same thing. Cushcraft can't replace the individual trap. I've obtained a spare 30 meter trap from another ham and am modifying it to replace the bad 20 meter trap. I don't know if this will work or not, but I had great success with the R7000 during the 2 years I had it. I worked over 280 countries with it and was very pleased with its performance. Dave AA1VX |
Apparently, due to a design flaw in the original model, you can easily burn
out the 20 meter trap by running legal power. I destroyed mine running 600 watts, and another ham burned his out doing the same thing. Cushcraft can't replace the individual trap. I've obtained a spare 30 meter trap from another ham and am modifying it to replace the bad 20 meter trap. I don't know if this will work or not, but I had great success with the R7000 during the 2 years I had it. I worked over 280 countries with it and was very pleased with its performance. Dave AA1VX |
Cushcraft R7000
Hello,
Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM |
"Frank Armstrong" skrev i melding ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM It is a good antenna. The weak part is at the bottom, where the base is attached to the radiator. I would strengthen that tube. 73 Rag LA5HE |
"Frank Armstrong" skrev i melding ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM It is a good antenna. The weak part is at the bottom, where the base is attached to the radiator. I would strengthen that tube. 73 Rag LA5HE |
Frank Armstrong wrote:
Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Frank, I haven't used that particular one. Several years ago I bought a Gap "Eagle" vertical--my wife wasn't happy with wires festooned through the trees. :-) It actually worked fairly well and was very easy to set up and to use. For about 95% of contacts on which I compared them, though, it was down a couple of S-units compared to a full-sized loop fed with ladderline. I think this is pretty typical of multiband verticals, based on what I've heard from others. They certainly can work well, particularly considering how little space they take and their low visual profile. Not sure if this helps you much .. but it IS better than the incredibly vile political gibberish, isn't it? ;-) 73! --Ken AC4RD _______________________________________________ Ken Kuzenski AC4RD kuzen001 at acpub .duke .edu _______________________________________________ All disclaimers apply, see? www.duke.edu/~kuzen001 |
Frank Armstrong wrote:
Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Frank, I haven't used that particular one. Several years ago I bought a Gap "Eagle" vertical--my wife wasn't happy with wires festooned through the trees. :-) It actually worked fairly well and was very easy to set up and to use. For about 95% of contacts on which I compared them, though, it was down a couple of S-units compared to a full-sized loop fed with ladderline. I think this is pretty typical of multiband verticals, based on what I've heard from others. They certainly can work well, particularly considering how little space they take and their low visual profile. Not sure if this helps you much .. but it IS better than the incredibly vile political gibberish, isn't it? ;-) 73! --Ken AC4RD _______________________________________________ Ken Kuzenski AC4RD kuzen001 at acpub .duke .edu _______________________________________________ All disclaimers apply, see? www.duke.edu/~kuzen001 |
Thanks Rag, Ken and Dave
Believe me Ken ALL inputs and experiences are of value when it's 'head-scratching' time. I, too, have used verticals in the past and found them very good. Thanks, Rag, for the tip about the lower tube - I'll check this out.Much better to fix it before it's broken in this case. Dave - Thanks for your tip about the traps. You may be interested to check out the website at: http://www.qsl.net/ei7ba/r7_vertical.htm where EI7BA has listed the resonant frequency of the various traps. Guess you might have these already though. Thanks again everyone. I think I'll go for it. Frank GW3CNM |
Thanks Rag, Ken and Dave
Believe me Ken ALL inputs and experiences are of value when it's 'head-scratching' time. I, too, have used verticals in the past and found them very good. Thanks, Rag, for the tip about the lower tube - I'll check this out.Much better to fix it before it's broken in this case. Dave - Thanks for your tip about the traps. You may be interested to check out the website at: http://www.qsl.net/ei7ba/r7_vertical.htm where EI7BA has listed the resonant frequency of the various traps. Guess you might have these already though. Thanks again everyone. I think I'll go for it. Frank GW3CNM |
"Frank Armstrong" wrote in message ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Hi, Excellent vertical. Over 295 DXCC confirmed in several years. Less good during low solar cycle as now, but still good, much better than any G5RV (I use now). A bit sensitive to QRM. Works fine at ground level with soft radials burried into the ground but best results are obtained at about10m high (on a small pylon) and with 10 radials in the ground. Another ham used it too : see his QSL album on http://www.qsl.net/on4ldu/ Thierry ON4SKY, LX3SKY http://www.astrosurf.com/lombry Thanks Frank GW3CNM |
"Frank Armstrong" wrote in message ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Hi, Excellent vertical. Over 295 DXCC confirmed in several years. Less good during low solar cycle as now, but still good, much better than any G5RV (I use now). A bit sensitive to QRM. Works fine at ground level with soft radials burried into the ground but best results are obtained at about10m high (on a small pylon) and with 10 radials in the ground. Another ham used it too : see his QSL album on http://www.qsl.net/on4ldu/ Thierry ON4SKY, LX3SKY http://www.astrosurf.com/lombry Thanks Frank GW3CNM |
There are 54 reviews of this antennas by owners at URL:
http://www.eham.net/reviews/detail/298 -- 73 From the Keyboard ========================= "Frank Armstrong" wrote in message ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM |
There are 54 reviews of this antennas by owners at URL:
http://www.eham.net/reviews/detail/298 -- 73 From the Keyboard ========================= "Frank Armstrong" wrote in message ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM |
Hello again,
Thanks to Thierry and Surious Noise for the info.Certainly ON4ldu seems to think a lot of the r7000 but opinion on the 'eham' site seems divided. Perhaps the 7000 is OK if you have a little time on your hands and a little patience? I'll think about it. Thanks to all, you've been a great help. Frank "Spurious Noise" wrote in message news:opmnb.84003$vj2.13075@fed1read06... There are 54 reviews of this antennas by owners at URL: http://www.eham.net/reviews/detail/298 -- 73 From the Keyboard ========================= "Frank Armstrong" wrote in message ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM |
Hello again,
Thanks to Thierry and Surious Noise for the info.Certainly ON4ldu seems to think a lot of the r7000 but opinion on the 'eham' site seems divided. Perhaps the 7000 is OK if you have a little time on your hands and a little patience? I'll think about it. Thanks to all, you've been a great help. Frank "Spurious Noise" wrote in message news:opmnb.84003$vj2.13075@fed1read06... There are 54 reviews of this antennas by owners at URL: http://www.eham.net/reviews/detail/298 -- 73 From the Keyboard ========================= "Frank Armstrong" wrote in message ... Hello, Please, has anyone out there any experience of using a Cushcraft R7000 vertical ant? I was thinking of buying one second-hand. Thanks Frank GW3CNM |
On Tue, 28 Oct 2003 07:44:39 -0800, "Frank Armstrong"
wrote: Perhaps the 7000 is OK if you have a little time on your hands and a little patience? When you ask the question "How good is an xxxxx antenna", you have to remember that the answers are all relative - to the type of antennas that the person answering the question has used. A guy who's never had a directional antenna, and who was using a G5RV up 10 feet will tell you that a mutiband vertical is WONDERFUL..... A guys who's been using a five element monobander on every band will tell you that a multiband vertical sucks......... So one guy will be very happy with it, and another will not. What YOU have been using may be the deciding factor in the question will YOU like it..... I would venture to guess that if you put up a dipole on any particular band, and compared it in real time to the R7000, you'd find the dipole usually worked better. But then you'll need a bunch of dipoles to duplicate each band, and maybe you don't have that much space..... I don't know much about antennas, technically, but I've always like to play with them, and I have the habit of comparing antennas with each other - always try and have two I can switch - instead of comparing what other people think about them. With lots of sunspots, you can work 278 countries with a chain link fence for an antenna, so boxes full of QSL cards don't necessarily indicate that an antenna works well. Having used a few of different multiband verticals in the past, I'd say your money would be better spent on a ball of wire (if you have the space to put it up). With two trees, some rope, and some wire, you can build a four element 20 meter quad for a couple bucks, and it'll beat the vertical by 40db..... 73, Jim KH2D |
On Tue, 28 Oct 2003 07:44:39 -0800, "Frank Armstrong"
wrote: Perhaps the 7000 is OK if you have a little time on your hands and a little patience? When you ask the question "How good is an xxxxx antenna", you have to remember that the answers are all relative - to the type of antennas that the person answering the question has used. A guy who's never had a directional antenna, and who was using a G5RV up 10 feet will tell you that a mutiband vertical is WONDERFUL..... A guys who's been using a five element monobander on every band will tell you that a multiband vertical sucks......... So one guy will be very happy with it, and another will not. What YOU have been using may be the deciding factor in the question will YOU like it..... I would venture to guess that if you put up a dipole on any particular band, and compared it in real time to the R7000, you'd find the dipole usually worked better. But then you'll need a bunch of dipoles to duplicate each band, and maybe you don't have that much space..... I don't know much about antennas, technically, but I've always like to play with them, and I have the habit of comparing antennas with each other - always try and have two I can switch - instead of comparing what other people think about them. With lots of sunspots, you can work 278 countries with a chain link fence for an antenna, so boxes full of QSL cards don't necessarily indicate that an antenna works well. Having used a few of different multiband verticals in the past, I'd say your money would be better spent on a ball of wire (if you have the space to put it up). With two trees, some rope, and some wire, you can build a four element 20 meter quad for a couple bucks, and it'll beat the vertical by 40db..... 73, Jim KH2D |
On Tue, 28 Oct 2003 18:42:32 -0800, "Frank Armstrong"
wrote: I only work 40 c.w. You might want to look at the Butternut HF2V, it's 40 & 80, no traps. 73, Jim KH2D |
On Tue, 28 Oct 2003 18:42:32 -0800, "Frank Armstrong"
wrote: I only work 40 c.w. You might want to look at the Butternut HF2V, it's 40 & 80, no traps. 73, Jim KH2D |
Hi Jim,
Well yes, of course your basically right, though I might quarrel with your 40db for the quad and in any case I'm a little low on tall trees! Really all I want to do is get the current node a little higher into the air and the 7000 looked as if it may be the answer (compared with my 1/4-wave at ground level). I don't want to alienate the neighbours so the less stuff I put up, the better. Right now I'm torn both ways ----- from all accounts the 7000 may need a little maintenance as time goes by, especially as where I live the wind howls and howls during the winter. We'll see! I only work 40 c.w. ("so why a multiband ant ?", I can hear everyone howling). I may well end up with a dipole with the middle tied as near the top of my GP as possible. I have a good takeoff over the sea so that should be worth a db or two. Best wishes, Frank wrote in message .. . On Tue, 28 Oct 2003 07:44:39 -0800, "Frank Armstrong" wrote: Perhaps the 7000 is OK if you have a little time on your hands and a little patience? When you ask the question "How good is an xxxxx antenna", you have to remember that the answers are all relative - to the type of antennas that the person answering the question has used. A guy who's never had a directional antenna, and who was using a G5RV up 10 feet will tell you that a mutiband vertical is WONDERFUL..... A guys who's been using a five element monobander on every band will tell you that a multiband vertical sucks......... So one guy will be very happy with it, and another will not. What YOU have been using may be the deciding factor in the question will YOU like it..... I would venture to guess that if you put up a dipole on any particular band, and compared it in real time to the R7000, you'd find the dipole usually worked better. But then you'll need a bunch of dipoles to duplicate each band, and maybe you don't have that much space..... I don't know much about antennas, technically, but I've always like to play with them, and I have the habit of comparing antennas with each other - always try and have two I can switch - instead of comparing what other people think about them. With lots of sunspots, you can work 278 countries with a chain link fence for an antenna, so boxes full of QSL cards don't necessarily indicate that an antenna works well. Having used a few of different multiband verticals in the past, I'd say your money would be better spent on a ball of wire (if you have the space to put it up). With two trees, some rope, and some wire, you can build a four element 20 meter quad for a couple bucks, and it'll beat the vertical by 40db..... 73, Jim KH2D |
Hi Jim,
Well yes, of course your basically right, though I might quarrel with your 40db for the quad and in any case I'm a little low on tall trees! Really all I want to do is get the current node a little higher into the air and the 7000 looked as if it may be the answer (compared with my 1/4-wave at ground level). I don't want to alienate the neighbours so the less stuff I put up, the better. Right now I'm torn both ways ----- from all accounts the 7000 may need a little maintenance as time goes by, especially as where I live the wind howls and howls during the winter. We'll see! I only work 40 c.w. ("so why a multiband ant ?", I can hear everyone howling). I may well end up with a dipole with the middle tied as near the top of my GP as possible. I have a good takeoff over the sea so that should be worth a db or two. Best wishes, Frank wrote in message .. . On Tue, 28 Oct 2003 07:44:39 -0800, "Frank Armstrong" wrote: Perhaps the 7000 is OK if you have a little time on your hands and a little patience? When you ask the question "How good is an xxxxx antenna", you have to remember that the answers are all relative - to the type of antennas that the person answering the question has used. A guy who's never had a directional antenna, and who was using a G5RV up 10 feet will tell you that a mutiband vertical is WONDERFUL..... A guys who's been using a five element monobander on every band will tell you that a multiband vertical sucks......... So one guy will be very happy with it, and another will not. What YOU have been using may be the deciding factor in the question will YOU like it..... I would venture to guess that if you put up a dipole on any particular band, and compared it in real time to the R7000, you'd find the dipole usually worked better. But then you'll need a bunch of dipoles to duplicate each band, and maybe you don't have that much space..... I don't know much about antennas, technically, but I've always like to play with them, and I have the habit of comparing antennas with each other - always try and have two I can switch - instead of comparing what other people think about them. With lots of sunspots, you can work 278 countries with a chain link fence for an antenna, so boxes full of QSL cards don't necessarily indicate that an antenna works well. Having used a few of different multiband verticals in the past, I'd say your money would be better spent on a ball of wire (if you have the space to put it up). With two trees, some rope, and some wire, you can build a four element 20 meter quad for a couple bucks, and it'll beat the vertical by 40db..... 73, Jim KH2D |
Thanks Bob and Jim
I hurried over to the reviews of the HF2V and AV-640 on the eham site and they made for interesting reading. I think I'll hang on to my hard-earned cash for a couple of weeks. There's a big radio sale then and there are usually a few guys selling antenna gear. All the comments on this thread have been most helpful to me - and I really mean that. There's nothing like getting a little input from those who have actually used a piece of equipment, so thanks to all. Hope to see you on 40m CW. Frank (North Wales coast) websites: http://www.qsl.net/gw3cnm http://savanna-rx7.co.uk ====================================== wrote in message .. . On Tue, 28 Oct 2003 18:42:32 -0800, "Frank Armstrong" wrote: I only work 40 c.w. You might want to look at the Butternut HF2V, it's 40 & 80, no traps. 73, Jim KH2D |
Thanks Bob and Jim
I hurried over to the reviews of the HF2V and AV-640 on the eham site and they made for interesting reading. I think I'll hang on to my hard-earned cash for a couple of weeks. There's a big radio sale then and there are usually a few guys selling antenna gear. All the comments on this thread have been most helpful to me - and I really mean that. There's nothing like getting a little input from those who have actually used a piece of equipment, so thanks to all. Hope to see you on 40m CW. Frank (North Wales coast) websites: http://www.qsl.net/gw3cnm http://savanna-rx7.co.uk ====================================== wrote in message .. . On Tue, 28 Oct 2003 18:42:32 -0800, "Frank Armstrong" wrote: I only work 40 c.w. You might want to look at the Butternut HF2V, it's 40 & 80, no traps. 73, Jim KH2D |
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