Re: KX1 - We need to develop the ideal antenna
Posted by
Vic K2VCO on
May 16, 2011; 3:44pm
URL: http://elecraft.85.s1.nabble.com/KX1-We-need-to-develop-the-ideal-antenna-tp6366906p6369170.html
There was an article in QST a few years back in which a guy actually measured losses in
various kinds of zip cord. Losses were very high -- his conclusion was "don't use this
stuff for feedline except in emergencies."
On 5/16/2011 8:38 AM, Ron D'Eau Claire wrote:
> The feed line losses go up as the impedance goes down. "Zip" cord (like
> speaker wire) has two close spaced conductors, so the impedance is quite low
> as "balanced" feed lines go. I've seen actual impedance measurements in the
> 50 to 100 ohm range published.
>
> So it might be a little better than coax at high SWR's but not
> significantly.
>
> Ron AC7AC
>
> -----Original Message-----
>
> David,
>
> I take your point. Not sure about the use of twin loudspeaker wire for
> portable applications. It might be satisfactory when split to make the
> antenna element, but could be lossy when used as a feeder, don't know.
>
> 73,
> Geoff
> GM4ESD
>
> On May 16, 2011 at 12:48 PM, CUTTER DAVID
>
>> I can understand this in a home situation, but for use with a very
>> lightweight, low bulk portable rig like a KX1 I would use something like
>> 16/0.2, (16 strands of 0.2mm copper, similar to 14/0076). I>
>> wouldn't for instance hang flexweave from a floppy fibreglass pole, but
>> I've done it with this thin multi-strand insulated wire. Flat twin
>> loudspeaker wire as shown in (all?) post-war ARRL handbooks>
>> doesn't even need a centre insulator/connector. My criteria is: if it
>> falls out of the tree/balcony/hotel room window, will it cause damage or
>> hurt someone?
>
> 73
> David
> G3UNA
--
Vic, K2VCO
Fresno CA
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