[amsat-bb] Insulated AWG to bare copper or aluminum

[Roger]

Oops. My bad. James, not Bob.


73, Roger
W7TZ
CN83ia

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
> W7TZ
> CN83ia
>
> 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
>> modeling
>> 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
>> not
>> 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
>> on
>> the directors is larger, SHORTENING it about 25mm, or an inch.  But even
>> so, these dimensional changes are FAR less significant that the changes
>> due
>> 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>
>> wrote:
>>
>> >  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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>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>> to all interested persons worldwide without requiring membership.
>> Opinions expressed
>> are solely those of the author, and do not reflect the official views of
>> AMSAT-NA.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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>
>