[TowerTalk] TowerTalk Digest, Vol 222, Issue 13

Tue Jun 15 15:07:09 EDT 2021

Lloyd download the stuff on message 4 good stuff

Denis

On Tue, Jun 15, 2021 at 10:01 AM <towertalk-request at contesting.com> wrote:

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> Today's Topics:
>
>    1. Re: 80m shunt and 160m shunt mounted on same tower (Gene Smar)
>    2. material permeability of a BalUn core (Kostas SV1DPI)
>    3. Re: material permeability of a BalUn core (Jim Brown)
>    4. New tool - toroidal ferrite core inductor calculator (Dan Maguire)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 14 Jun 2021 12:28:47 -0400
> From: Gene Smar <ersmar at verizon.net>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] 80m shunt and 160m shunt mounted on same
>         tower
> Message-ID: <10a1a2bd-af36-ec56-8f9c-fb9afb66848e at verizon.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Ted:
>
>  ??? On my 64 foot tower? I've got a shunt feed for 160M and a
> half-sloper wire (1/4 WL) for 80M on adjacent faces.? They're not both
> shunt feeds, I realize, but this should give you some reassurance that
> you can use your tower as a radiating element on separate bands.? I
> don't run an amp here so my series cap for 160M is a bread slicer
> variable in a plastic show box-like container.
>
>  ???? Good luck and let us know how it all turns out for you.
>
> 73 de
> Gene Smar? AD3F
>
>
> On 6/13/2021 9:16 PM, K9MA wrote:
> > I've been doing that for decades. It's a 70 foot tower with a JK
> > Mid-Tri near the top, a D40 6 feet above it, and a JK CS3-JK on a
> > sidearm at about 50 feet. There are two gamma matches on opposite
> > sides of the tower. The 80 meter side has a second piece of tubing in
> > parallel most of the way up to reduce the inductance, Q, and peak
> > voltage. There are variable capacitors at the base of the tower, with
> > a relay to switch between bands.) I can provide more details offline
> > in a week or so.
> >
> > http://sdellington.us/hr/Tower%202019/Blog/Photos/Gamma1.jpg
> > <http://sdellington.us/hr/Tower%202019/Blog/Photos/Gamma1.jpg>
> >
> > (There are a bunch of ropes in the photo, but the near side is 80
> > meters.)
> >
> > http://sdellington.us/hr/Tower%202019/Blog/Photos/Tuner2.jpg
> > <http://sdellington.us/hr/Tower%202019/Blog/Photos/Tuner2.jpg>
> >
> > 73,
> > Scott K9MA
> >
> >
> > On 6/13/2021 5:30 PM, k8na wrote:
> >> I am putting up a new tower. I want to have 80m shunt and 160m shunt
> >> mounted on the same tower. Does anyone have any experience doing
> >> this? What problems? The tower is a 60ft-er with 12ft of mast and a
> >> Mosley PRO C-67-3, 4el 6m yagi, and 2m/440 vertical.
> >>
> >> TU/73? ...? de Ted K8NA
> >>
> >>
> >> _______________________________________________
> >>
> >>
> >>
> >> _______________________________________________
> >> TowerTalk mailing list
> >> TowerTalk at contesting.com
> >> http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 14 Jun 2021 20:39:32 +0300
> From: Kostas SV1DPI <sv1dpi2 at gmail.com>
> To: towertalk at contesting.com
> Subject: [TowerTalk] material permeability of a BalUn core
> Message-ID: <c17b9217-91bf-a149-182b-7810c50a8ac9 at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I am reading the book "Understanding, Building, and Using Baluns and Ununs"
>
> In the page 37 refers to 1:1 baluns. So it recommends that the core of a
> Reisert balun (current balun) should have a permeability of 250 (160m)
> or 125 (80 to 10m) or 40 (20-10m) for maximum efficiency. I have seen in
> several articles that some guys make their baluns using mix 31 ferrites
> (2631803802 has 1500) or ft240-43 (permeability=800). As I can
> understand a higher permeability means a better chock or not? According
> the book I gain efficiency with lower permeability but what I loose?
> Have something changed after the book is written or not? Comments please...
>
> 73 Kostas SV1DPI
>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 14 Jun 2021 11:14:00 -0700
> From: Jim Brown <jim at audiosystemsgroup.com>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] material permeability of a BalUn core
> Message-ID:
>         <264cccaf-5fde-d5ae-ce21-ee3196f8dbf9 at audiosystemsgroup.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Kostas,
>
> The work you are reading is somewhat out of date, in that Fair-Rite's
> #31 material did not exist when Jerry was working, and initial
> permeability is not a useful parameter when understanding common mode
> chokes that are useful at HF. What matters, for CHOKES, is their
> resonance and a high value of resistance at resonance.
>
> I suggest that you STUDY my work at k9yc.com/publish.htm. The Ham's
> Guide is a tutorial on RFI and how chokes work, and the applications
> note on Transmitting Chokes for160-1M are what you need to study.
>
> 73, Jim K9YC
>
> On 6/14/2021 10:39 AM, Kostas SV1DPI wrote:
> > I am reading the book "Understanding, Building, and Using Baluns and
> Ununs"
> >
> > In the page 37 refers to 1:1 baluns. So it recommends that the core of a
> > Reisert balun (current balun) should have a permeability of 250 (160m)
> > or 125 (80 to 10m) or 40 (20-10m) for maximum efficiency. I have seen in
> > several articles that some guys make their baluns using mix 31 ferrites
> > (2631803802 has 1500) or ft240-43 (permeability=800). As I can
> > understand a higher permeability means a better chock or not? According
> > the book I gain efficiency with lower permeability but what I loose?
> > Have something changed after the book is written or not? Comments
> please...
> >
> > 73 Kostas SV1DPI
> >
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk at contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 14 Jun 2021 13:36:48 -0700
> From: Dan Maguire <danac6la at gmail.com>
> To: towertalk <towertalk at contesting.com>
> Subject: [TowerTalk] New tool - toroidal ferrite core inductor
>         calculator
> Message-ID:
>         <
> CAOnXRMtpC3KYDbzxqieH1cs4YEy7QOkN_Aq9X_Q469usiaj43A at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> This new tool may be of interest to at least a few TowerTalk folks.
> Currently being discussed, with some sample illustrations, here:
>
>
> https://forums.qrz.com/index.php?threads/new-tool-toroidal-ferrite-core-inductor-calculator.768222/
>
> Or you can download the full 13 page Help pdf and the Excel workbook
> from the link at the bottom of this page:
>
>
> https://sites.google.com/view/sp3l-hf-antennas/home-page/miscellaneous/toroidal-ferrite-core-inductor-calculator
>
> Note that the workbook requires Excel 2007 or newer.  It cannot be
> used with other spreadsheet programs such as OpenOffice and
> OfficeLibre nor with Excel 2003 and older.
>
> Dan, AC6LA
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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> ------------------------------
>
> End of TowerTalk Digest, Vol 222, Issue 13
> ******************************************
>