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Old October 26th 03, 01:34 PM
Dave Glow, AA1VX
 
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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



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Old October 26th 03, 01:34 PM
Dave Glow, AA1VX
 
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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


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Old October 26th 03, 03:55 PM
Frank Armstrong
 
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Default 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


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Old October 26th 03, 06:02 PM
Ragnar Otterstad
 
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"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


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Old October 26th 03, 06:02 PM
Ragnar Otterstad
 
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"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




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Old October 26th 03, 06:03 PM
 
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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

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Old October 26th 03, 06:03 PM
 
Posts: n/a
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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

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Old October 27th 03, 05:46 AM
Frank Armstrong
 
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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


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Old October 27th 03, 05:46 AM
Frank Armstrong
 
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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


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Old October 27th 03, 06:17 PM
Thierry
 
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"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






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