[amsat-bb] Insulated AWG to bare copper or aluminum
ai7rogerroger at gmail.com
Thu Oct 13 22:15:53 UTC 2016
Oops. My bad. James, not Bob.
On Thu, Oct 13, 2016 at 3:12 PM, Roger <ai7rogerroger at gmail.com> wrote:
> Bob, you're going to get a wide variety of answers to your question and
> for good reason. All insulation is not created equal and therefore will
> have varying effects on your project. I'm not aware of a simple formula
> either but could possibly assist in your efforts. It sounds like you want
> to use 10awg Romex. In this case, I'd strip the insulation from the copper,
> secure one end of the copper in a vice or similar device, put the far end
> in a variable speed drill and gently twist the copper wire to create
> stiffer material. What yagi design do you have in mind? How many elements?
> What type of feed? How high do you intend to mount the antenna? These
> things all need to be taken into consideration for efficiency.
> 73, Roger
> On Thu, Oct 13, 2016 at 2:41 PM, Bob <WB4SON at gmail.com> wrote:
>> The best I can do for you comes from the documentation for antenna
>> software which does cover the impact of the element diameter. The impact
>> on the driven reflector is almost zero. The impact on the directors is
>> quite zero.
>> Doubling the diameter of the element, example going from 12.5mm to 25mm
>> (1/2" to 1") will cause the driven element to SHORTEN by 5mm (that's about
>> 0.2 inches). In other words, you can pretty much forget it. The impact
>> the directors is larger, SHORTENING it about 25mm, or an inch. But even
>> so, these dimensional changes are FAR less significant that the changes
>> to height, ground characteristics, and what else is near the antenna. In
>> other words you can forget about factoring it in.
>> Same thing is pretty much true for insulated vs. non-insulated wire -- you
>> can pretty much forget about it.
>> Good luck!
>> 73, Bob, WB4SON
>> On Thu, Oct 13, 2016 at 5:15 PM, James Hickox <jameshickox at sbcglobal.net>
>> > Hello All, I am wondering if there is any "simple" conversion factor to
>> > use to modify the length of an antenna element from insulated #10 AWG
>> > copper wire to anther gage of wire or to aluminum or copper tubing. I
>> > don't wish to learn any modeling software at this time I need the
>> > information so I can use materials I have on hand to build yagi antennas
>> > for 2 meters and 70 centimeters.
>> > Thanks and 73,James, AA5AO
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