http://elecraft.85.s1.nabble.com/wire-for-random-wire-antenna-using-kx3-tp7647146p7647157.html
Speaker wire because he has it, vs. buying wire specifically for a
> On 12/17/2018 6:45 AM, Don Wilhelm wrote:
>> However, if you are using the speaker wire as a transmission line, it
>> has relatively high loss characteristics
>
> Compared to what? So-called speaker wire (which is really lousy for
> speakers because it should be twisted pair to minimize RFI) has Zo in
> the range of 75-100 ohms. Unless it's wet, virtually all the loss in
> transmission lines below about 100 MHz is due to wire resistance, not
> dielectric loss. There is, of course, additional loss due to any
> mismatch that may be present, but that still comes down to loss in the
> resistance of the line. While I haven't measured any zip cord, I've
> measured a lot of closely spaced parallel wire transmission line made
> from THHN, enameled copper, and Teflon insulated #12 silver-coated
> copper. In order of loss at dB/100 ft at 10 MHz from low to high, the
> Teflon #12 is lowest at 0.94dB, then RG400 at 1.22 dB (about the same as
> RG58), then #12 THHN at 1.34 dB. #12 or #10 enameled copper had the
> greatest loss, 2.4 dB/100 ft.
>
> 73, Jim K9YC
>
>
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