Topband: 160m Vertical

[Kees Nijdam]

If you have a quater wave vertical resonating on 1,9 Mhz, the swr 1:2 bandwith will be > 200 kHz.
Even if your feedline has 3 dB attenuation (that is a lot on this band), the additional loss will be 0,33 dB.
Nothing to worry about, and not at all a reason to use a tuner at the base of the antenna.
If your TX has troubles to give its power correct to the cable, use a tuner in the shack.

73, Kees PE5T

Verzonden vanuit Mail voor Windows 10

Van: fmoeves
Verzonden: vrijdag 15 mei 2020 19:20
Aan: topband at contesting.com
Onderwerp: Re: Topband: 160m Vertical

Tree, Thank you very good idea. One more reason to hang out here. I used the Harpin match as Jay mentioned on my inverted L worked great. 73 Fred KB4QZH 
-------- Original message --------From: Tree <tree at kkn.net> Date: 5/15/20  11:34 AM  (GMT-05:00) To: Frank Donovan <donovanf at starpower.net> Cc: 160 <topband at contesting.com> Subject: Re: Topband: 160m Vertical One approach for the inductor that I have used when doing parasitic elementtuning is to put two SO239's in series and either put a shorted plug in forno added inductance - or a PL259 fashioned with a few turns of heavy gaugewire.  You can label them for the frequency you are wanting.I used that technique to go from a director to a reflector back when I wasplaying with a vertical parasitic array on 160.Tree N6TROn Fri, May 15, 2020 at 8:28 AM <donovanf at starpower.net> wrote:>> Hi Ron,>>>> A more reliable approach is a tuner in your shack. The extra coax> cable loss from elevated VSWR is insignificant on topband.>>> How high up the band do you want to go and at what maximum VSWR?>>> A resonant Rohn 25 160M vertical will be about 124 feet tall for> resonance around 1820 kHz>> If for some reason you must install a tuner at the feed point of the> vertical, follow Tree's advice and make it slightly short: 120 feet> of 115 ft if you need to tune for minimum VSWR above 1900 kHz.>>>> Use a small tapped inductor to tune it around the band.>>> 73> Frank> W3LPL>>>>>> ----- Original Message ----->> From: "Tree" <tree at kkn.net>> To: "Ron WV4P" <wv4ptn at gmail.com>> Cc: "160" <topband at contesting.com>> Sent: Friday, May 15, 2020 3:18:39 PM> Subject: Re: Topband: 160m Vertical>> Slightly shorter makes it easy to use an inductor to make up the> difference. If you make it long - you can do the same with a capacitor -> but it's typically more trouble than the inductor.>> Tree N6TR>> On Fri, May 15, 2020 at 8:15 AM Ron WV4P <wv4ptn at gmail.com> wrote:>> > I have built an insulated base for a 1/4 wave 160 antenna. The antenna> > will be XXX' of Rohn 25. In searching I see people using heights from> 115'> > - 130' with a pretty high number around 124'.> > I do not know how I am going to match it yet, I figure I will do my> > research on that once it's up so I can learn while experimenting.... But> > the height has me second guessing. I want it tunable across the band,> > perhaps using a Tornado Tuner like my JK 801's have with a motorized> > inductor ? But the question at hand is do I want the antenna Tall or> Short> > ? What is the Method behind the Madness ? :o)> >> > Thanks in advance,> > Ron WV4P> > _________________> > Searchable Archives: http://www.contesting.com/_topband - Topband> > Reflector> >> _________________> Searchable Archives: http://www.contesting.com/_topband - Topband> Reflector>> _________________> Searchable Archives: http://www.contesting.com/_topband - Topband> Reflector>_________________Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
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