It would have to stretch about 4-5ft to see a difference of 50Khz in resonance. I doubt it has stretched that far.
I see huge swings in my inverted L resonance (with 4 elevated radials) and it is 100% related the ground freezing and unfreezing and ground conductivity changing. My 2:1 SWR points are about 80Khz apart. 2 months ago my resonance was about 1850khz. Today it has slice up and the end result is that my SWR at the bottom of the band is now 2.3:1 when it used to be 1.9:1. That is in 2 readings 28 days apart. My new low edge is 1813Khz. The easy fix is to add 3ft tot he vertical part. In the spring, I will have to remove it again. I have before and after screen shots, but I don't think I can send them to this reflector. If someone wants to see them, let me know and I'll send them to you. Like Don said, his broad bandwidth is due to ground losses. Mike va3mw On Mon, Dec 3, 2018 at 10:30 AM Don Wilhelm <donw...@embarqmail.com> wrote: > Not necessarily - notice the relatively flat SWR (less than 2:1) over a > large frequency range (for 160 meters). That normally means that the > antenna is acting more like a resistance than a radiator. > > I would expect the SWR on 160 meters to be low only over a 25kHz or at > most 50kHz range of the band. > > When the SWR bandwidth of an antenna increases, you should be looking > for a problem in that feedline, antenna to feedline connections or in > the case of a vertical, the ground radial system. > > One possibility is that the radial wires installed were aluminum - they > do not last very long in the ground, for some reason, moles like to chew > on them. > > 73, > Don W3FPR > > On 12/3/2018 9:18 AM, Don Roberts via Elecraft wrote: > > Lee, it looks like your inverted L wire has stretched. Check with an > antenna analyzer and you will probably see your resonate frequency is lower > than 1.8 Mhz. Perhaps time to do some triming. > ______________________________________________________________ > 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 va...@portcredit.net > ______________________________________________________________ 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
