[Elecraft] wire for random wire antenna using kx3

[hawley, charles j jr]

Interesting, I had an analog computer course exercise at the U of I Urbana when we had two verticals separated and phased to define the coverage pattern. I don’t remember the length of them. It’d be interesting to recall what it was.

Chuck 
KE9UW

Sent from my iPhone, cjack 

> On Dec 18, 2018, at 1:55 PM, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> Indeed.  AM broadcast vertical antennas are rarely 90 or 180 degrees, especially if they are a Class A station.  I think both KFI and KNX in Los Angeles have 195 deg verticals.  The design goal is to maximize field strength in the service area, accomplished by adjusting the height of the current maxima in the antenna element.  All resonance means is that the reactive component of the impedance at the feed point is zero.  A bigger problem for stations at the low end of the band ... KFI is at 640 KHz ... is that the usable bandwidth of the antenna can be less than the bandwidth of the DSB signal. [:-)  Last time I saw KFI's tower from Interstate 5, it appeared to have a fairly large capacity hat.
> 
> Elecraft ATU's [even the KX1 which is necessarily small with a limited number of L-C selections] seem to handle reactive loads just fine suggesting [to me at least] that designing an antenna for azimuth and/or elevation pattern may be more beneficial than achieving resonance in the desired part of the band.
> 
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
>> On 12/17/2018 7:45 PM, W2xj wrote:
>> Coming from the broadcast side, especially AM broadcasting, I never considered resonance particularly important. Really it’s just the transmitter that cares. We always put matching at the antenna but in ham radio we usually have tuners at or in the TX.
>> 
> 
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