[Elecraft] wire for random wire antenna using kx3

[Lynn W. Taylor, WB6UUT]

I didn't think from the original post that this was going to be used as 
transmission line.

I pictured simply tying both sides of the speaker wire to one terminal 
on the UN-UN.

Speaker wire because he has it, vs. buying wire specifically for a 
temporary antenna.

"Random wire" so the 9:1 transformer is needed if it's close to a 
resonant length and he's feeding the end, maybe not if the wire is some 
non-resonant length, like 53 feet or so.

73 -- Lynn

On 12/17/2018 11:58 AM, Jim Brown wrote:
> 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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