Let er rip Chuck. Post pictures.73,Gary K9GS
-------- Original message --------From: Chuck Dietz <w5prchuck@gmail.com> Date:
12/3/22 12:21 PM (GMT-06:00) To: Grant Saviers <grants2@pacbell.net> Cc:
towertalk@contesting.com Subject: Re: [TowerTalk] High power 2:1 transformer
was Re: 16om vertical
and the number of radials Thanks for the info. I think I am going with 60
radials on the ground. Iwant to use the 160 vertical tower to support an 80
meter array around it.Elevated radials might make adjustments way more
complicated. I have atractor and a good welder guy to weld a bracket and tube
to a single plowshear to make a radial plow.Chuck W5PROn Sat, Dec 3, 2022 at
11:59 AM Grant Saviers <grants2@pacbell.net> wrote:> The capacitors are on the
25 ohm side so the transmission line> transformer sees a low swr. Hence, the
caps need to handle 2x the> current. The details are in my QEX article
"Broad-banding a 160m> Vertical Antenna" QEX May/June 2019. (errata - pin #'s
on the> connecting cable are incorrect).>> No problems with the match since
putting it up, now at 101 confirmed on> 160m :) all on this antenna.>> The 8
elevated aluminum electric fence wire radials are all still> original. The top
support (center of the T) was broken off by a falling> branch which was replace
10/2022. However, I'm sure there is a lot of> loss (4+ db?) from being in a
forest. That's the price of free antenna> supports (110ft fir/cedar trees).>>
I currently have 10-12" of snow (YUK a record) on the ground and heavy> snow on
the radials (and droop). That has changed the resonance up> about 50KHz. So
another nice capability of the tuner.>> Grant KZ1W>> On 12/3/2022 06:57, Chuck
Dietz wrote:> > Grant, where is the series capacitor, before the un-un or
between it and> > the antenna?> >> > Chuck W5PR> >> > On Fri, Dec 2, 2022 at
7:53 PM Grant Saviers <grants2@pacbell.net> > <mailto:grants2@pacbell.net>>
wrote:> >> > I've been using the 2:1 one for 7 years at QRO for a good
match at> the> > antenna as I don't have a tuner at the amp. I can match <
1.4:1 the> > entire band by switching in series capacitance in 50KHz steps
to the> > 1.83 resonance.> >> > Grant KZ1W> >> > On 12/2/2022
13:05, marsh@ka5m.net <mailto:marsh@ka5m.net> wrote:> > > Yes, match at
the feedpoint.> > >> > > You might check out Balun Designs:> > >
https://www.balundesigns.com/1-2-balun-25-to-50-ohms-3kw-1213/> >
<https://www.balundesigns.com/1-2-balun-25-to-50-ohms-3kw-1213/>> > >> >
> Marsh, KA5M> > >> > >> > > -----Original Message-----> >
> From: TowerTalk <towertalk-bounces@contesting.com> >
<mailto:towertalk-bounces@contesting.com>> On Behalf Of Pete Smith> N4ZR> >
> Sent: Friday, December 02, 2022 2:39 PM> > > To:
towertalk@contesting.com <mailto:towertalk@contesting.com>> > > Subject:
[TowerTalk] High power 2:1 transformer was Re: 16om> > vertical and the
number of radials> > >> > > A somewhat related question - as the R
component at the feedpoint> > of my inverted L goes down toward 25 ohms,
I've begun wondering if I> > should do some matching at the feedpoint,
rather than using my tuner> > in the shack, even though feedline losses at
160 are relatively> > low. Can someone point me toward a good way to do a
2:1 downward> > transformation? I already have a common mode choke at the
feedpoint.> > >> > > 73, Pete N4ZR> > > Check out the new
Reverse Beacon Network web server> > at<https://reversebeacon.net
<https://reversebeacon.net>>.> > > For spots, please use your favorite> >
> "retail" DX cluster.> > >> > >> > >
_______________________________________________> > >> > >> > >>
> > _______________________________________________> > > TowerTalk
mailing list> > > TowerTalk@contesting.com
<mailto:TowerTalk@contesting.com>> > >
http://lists.contesting.com/mailman/listinfo/towertalk> >
<http://lists.contesting.com/mailman/listinfo/towertalk>> >
_______________________________________________> >> >> >> >
_______________________________________________> > TowerTalk mailing list>
> TowerTalk@contesting.com <mailto:TowerTalk@contesting.com>> >
http://lists.contesting.com/mailman/listinfo/towertalk> >
<http://lists.contesting.com/mailman/listinfo/towertalk>>
>>______________________________________________________________________________________________TowerTalk
mailing
listTowerTalk@contesting.comhttp://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|