If I remember right, the first rule in designing a BC antenna, when dirt was new, was PATTERN coverage. Once that was achieved they fixed everything else. Resonance??????? No one cared. Mel, K6KBE
From: Fred Jensen <k6...@foothill.net> To: elecraft@mailman.qth.net Sent: Tuesday, December 18, 2018 11:56 AM Subject: Re: [Elecraft] wire for random wire antenna using kx3 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. > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to farrerfo...@yahoo.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com