[Elecraft] KX2

[David Gilbert]

I'm confused why an EFHW should need a counterpoise.  If it needs a 
counterpoise it isn't actually acting like an EFHW.  If it needs a 
counterpoise that means there isn't enough choking impedance at the 
feedpoint, and it means that the feedline is radiating with the 
counterpoise acting as ... well, a counterpoise.

Manufacturers state a minimum length feedline simply to have the 
feedline losses help swamp out SWR variations along the line, and of 
course to marginally lower the SWR.

Dave
AB7E


On 7/14/2016 1:03 PM, Don Wilhelm wrote:
> Andy,
>
> What happens if you connect to a dummy load?  Does the KX2 tune it 
> properly?
> If so, then you know the KX2 is operating into a 50 ohm load OK.
>
> Do you have an antenna analyzer?  If so, then connect it to the 
> antenna feedline and look at the impedance - both real and reactive - 
> as well as the SWR.
> That will tell you whether the antenna is troublesome.
>
> You specifically said an EFHW - that should be a resonant antenna.  If 
> instead you have a random length wire (not a halfwave), and what is 
> the matching device?
> Many EFHW antennas need a counterpoise to work - that is why many 
> manufacturers state a *minimum* length feedline.
>
> If the problem is *not* the antenna, contact Elecraft support.
>
> 73,
> Don W3FPR
>
> On 7/14/2016 2:40 PM, Andy Clift wrote:
>> Just received my KX2, but unable to get it to tune an EFHW wire. I’ve 
>> tried a home made one and then tried a SOTABEAMS MultiBander that 
>> I’ve used successfully with an FT-857. I’ve checked the continuity in 
>> the wire and also the continuity in the KX2 between the BNC connector 
>> and where the wire connects inside the KX2 (as I removed this to fit 
>> the end panels). Battery is at over 11v. Any ideas please?
>>
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