[TowerTalk] remote tuner Vs lumped constants

[Gene Fuller]

I don't understand the problem with copperweld.  I have three 160 meter 
quarterwave slopers and three 80 meter bent vertical dipoles using alumoweld 
that have been up about 40 years with no problems. As I recall it is 20% 
aluminum.
Gene / W2LU

----- Original Message ----- 
From: "K8RI" <K8RI-on-TowerTalk at tm.net>
To: <towertalk at contesting.com>
Sent: Wednesday, July 24, 2013 6:55 PM
Subject: Re: [TowerTalk] remote tuner Vs lumped constants


> On 7/24/2013 2:53 PM, Jim Brown wrote:
>> On 7/24/2013 11:25 AM, K8RI wrote:
>>>
>>> The fan dipole on 75 can  give much wider, usable areas.
>>> With SS amps I'd like to be able to QSY with all the knob twisting.
>>
>> Yes. It's easy to make wire spreaders by cutting 1/2-in PVC conduit into
>> 18-in lengths and drilling holes for the wires. If one of the wires is
>> bare copper, the spreaders can be held in place with wire looped across
>> the spreader and soldered.  I use hard drawn copper that I "make" by
>> buying #8 bare copper from a big box store, tying one end around a tree
>> and the other around a trailer hitch, and slowly stretching it until it
>> breaks. The resulting hard drawn copper has stretched by roughly 10%.
>
> I used plain old stranded "antenna wire" that I hah on hand.  I too used 
> 1/2" conduit for a single end spreader about out 4' long
> http://www.rogerhalstead.com/ham_files/AntennaSpreader1.htm
> This is fed with LMR-400 using one of the current baluns described in your 
> tutorial http://www.rogerhalstead.com/ham_files/AntennaFeed2.htm
>
> That antenna is supported by ropes to large trees on the low end and a 
> rope through a pulley near the top of the 100' 45G. That rope is then 
> coiled up and tied off at the base of the tower making the raising and 
> lowering to prune quite easy.  That antenna is under several hundred 
> pounds of tension.
>
>  I've been thinking of using the same approach on the 160 half sloper
> except it's end fed of course.
>
> I think these antennas with stubs might at least come close to what I 
> want.
>
>>
>> I consider copperweld antenna wire a terrible choice for serious antenna
>> work. My neighbor, W6GJB, built a 2-wire fan dipole using copperweld and
>> RG8, and hoisted it between a couple of redwoods with pulleys on both
>> ends and a weight on one end. It was on the ground the next day -- the
>> copperweld broke.  We rebuilt it with the hard drawn copper.
>
> Only tried Copperweld once. Never purchased any more.
>
> I've also used that method to "hard draw" the wire,  You can also use a 
> lever (pipe, wood, what ever) the wire will stretch easily, but will reach 
> a point where the force required rises rapidly.  and you don't have to 
> break it, although breaking does guarantee it is as hard as it's gonna 
> get. <:-))
>
>>
>> The Power Point shows another elegantly simple and effective method of
>> broadbanding many resonant antennas that W6NL teaches in his classes at
>> Stanford. With SimSmith, you can simultaneously model both SWR and loss,
>> making it easy to optimize a design.
>>
>> 73, Jim K9YC
>
> 73
>
> Roger (K8RI)
>
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