[SBE-89-Alaska] [EXTERNAL] Re: HARRP
Stephen Lockwood
lockwood at hatdaw.com
Tue Aug 6 11:41:38 PDT 2024
Yes the magic of slugging. Changing the characteristic impedance of
the line to match the antenna impedance. I had a little dos program
that would help the process. I have only watched and never had to do on
my own.
Stephen S. Lockwood, P.E., PMP, President
Hatfield & Dawson Consulting Engineers
9500 Greenwood Ave N, Seattle, WA 98103
Phone 206 783 9151 ext 562 - Mobile 206 399 9440 -www.hatdaw.com
On 8/6/2024 11:21 AM, Clyde Plunkett wrote:
> Once upon a time, ERI had some Clif notes on the ferrite cores in
> rottertiller antennas. A little cloudy after 35 years…
>
> Clyde Plunkett, VP, Tres.
>
> Plunkett Enterprises, Inc.
> PEI-ALASKA Mortgage Field Services
> 4901 Folker Street
> Anchorage, Alaska 99507
> 907-563-6844
> 907-563-6845 fax
>
> A proud Sponsor and Member of NAMFS!
> Greetings from the "Last Frontier".
>
>
>
> On Mon, Aug 5, 2024 at 15:09 Pearson, Ron via SBE-89-alaska
> <sbe-89-alaska at sea.sbe16.org> wrote:
>
> So for instance in a rototiller antenna with a hard wave guide
> with a TE11 mode, how is the wave making it out of the rototiller,
> the thing looks completely sealed off and that it would just
> create a bunch of internal reflection. OR are those nub ends non
> metallic caps from with which the RF goes from contained RF to
> free space RF?
>
> Thank you 😊
>
> Ron
>
> *From:*SBE-89-alaska <sbe-89-alaska-bounces at sea.sbe16.org> *On
> Behalf Of *Pearson, Ron via SBE-89-alaska
> *Sent:* Tuesday, July 30, 2024 2:47 PM
> *To:* Stephen Lockwood <lockwood at hatdaw.com>; Charles Sather
> <CSather at knba.org>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org>
> *Subject:* Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP
>
> I have heard of these things talked about after my transition to
> EE but never could find a great reference on how exactly they worked.
>
> I get installing single stub series and parallel with either
> capacitive resistive or inductive loads (or simply calculating the
> coax length) in order to eliminate reactive power (which is your
> imaginary reflected power). I thought inductors had to be
> connected into the coax and not just slid over the outside in
> order to actually destructively interfere with reflected power.
>
> Additionally, if an RF wave is generated inside of a transmitter
> via electron change of motion and that wave is then guided in a
> wave guide how is that wave dispersed and manipulated in say a
> rototiller antenna. The root of the radiation is the electron
> manipulation in the transmitter itself.
>
> *From:*Stephen Lockwood <lockwood at hatdaw.com>
> *Sent:* Tuesday, July 30, 2024 12:38 PM
> *To:* Pearson, Ron <RonPearson at iheartmedia.com>; Charles Sather
> <CSather at knba.org>; SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org>
> *Subject:* Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP
>
> Nautel insist on toroidal ferrites on the coax headed to the
> antenna. As this keeps Thor from killing the MOSFETS. As the
> HAARP Transmitters are tubes they are not quite a sensitive. They
> are designed to operate anywhere on the smith chart for load
> impedance... In fact off the smith chart as they can work with a
> negative impedance (power being fed back).
>
> Stephen S. Lockwood, P.E., PMP, President
>
> Hatfield & Dawson Consulting Engineers
>
> 9500 Greenwood Ave N, Seattle, WA 98103 <https://www.google.com/maps/search/9500+Greenwood+Ave+N,+Seattle,+WA+98103?entry=gmail&source=g>
>
> Phone 206 783 9151 ext 562 - Mobile 206 399 9440 -www.hatdaw.com <http://www.hatdaw.com/>
>
> On 7/30/2024 1:14 PM, Pearson, Ron wrote:
>
> What are you referring to with ferrites?
>
> *From:*Stephen Lockwood <lockwood at hatdaw.com>
> <mailto:lockwood at hatdaw.com>
> *Sent:* Tuesday, July 30, 2024 12:07 PM
> *To:* Charles Sather <CSather at knba.org>
> <mailto:CSather at knba.org>; Pearson, Ron
> <RonPearson at iheartmedia.com>
> <mailto:RonPearson at iheartmedia.com>; SBE-89-Alaska
> <sbe-89-alaska at sea.sbe16.org> <mailto:sbe-89-alaska at sea.sbe16.org>
> *Subject:* Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP
>
> There are none!
>
> Stephen S. Lockwood, P.E., PMP, President
>
> Hatfield & Dawson Consulting Engineers
>
> 9500 Greenwood Ave N, Seattle, WA 98103 <https://www.google.com/maps/search/9500+Greenwood+Ave+N,+Seattle,+WA+98103?entry=gmail&source=g>
>
> Phone 206 783 9151 ext 562 - Mobile 206 399 9440 -www.hatdaw.com <http://www.hatdaw.com/>
>
> On 7/30/2024 1:04 PM, Charles Sather wrote:
>
> Did you get a count of ferrites for Jeff?
>
> *Charles Sather**
> *Chief Operating Officer,Koahnic Broadcast Corporation
> P. 907-793-3535 | koahnicbroadcast.org
> <http://koahnicbroadcast.org>
> Support KBC and its programs through Pick.Click.Give
>
> *From:*SBE-89-alaska <sbe-89-alaska-bounces at sea.sbe16.org>
> <mailto:sbe-89-alaska-bounces at sea.sbe16.org> *On Behalf Of
> *Pearson, Ron via SBE-89-alaska
> *Sent:* Tuesday, July 30, 2024 10:30 AM
> *To:* Stephen Lockwood <lockwood at hatdaw.com>
> <mailto:lockwood at hatdaw.com>; SBE-89-Alaska
> <sbe-89-alaska at sea.sbe16.org>
> <mailto:sbe-89-alaska at sea.sbe16.org>
> *Subject:* Re: [SBE-89-Alaska] [EXTERNAL] Re: HARRP
>
> Very cool thank you for the cliffs notes
>
> *From:*Stephen Lockwood <lockwood at hatdaw.com>
> *Sent:* Tuesday, July 30, 2024 10:20 AM
> *To:* Pearson, Ron <RonPearson at iheartmedia.com>;
> SBE-89-Alaska <sbe-89-alaska at sea.sbe16.org>
> *Subject:* Re: [EXTERNAL] Re: [SBE-89-Alaska] HARRP
>
> They did. They use NEC4 (if I remember correctly). It
> is just classic array physics - just big at these
> frequencies. The physics is the same for the nifty flat
> panel radar arrays or curtain dipole arrays like we use in
> HF broadcasting. They just have some very cool software
> to change the transmitter exciters to provide beam
> steering, circular polarization, and lots of other cool
> stuff. Each dipole has its own transmitter. 180 cross
> dipoles with 360 10 kW transmitters.
>
> Stephen S. Lockwood, P.E., PMP, President
>
> Hatfield & Dawson Consulting Engineers
>
> 9500 Greenwood Ave N, Seattle, WA 98103 <https://www.google.com/maps/search/9500+Greenwood+Ave+N,+Seattle,+WA+98103?entry=gmail&source=g>
>
> Phone 206 783 9151 ext 562 - Mobile 206 399 9440 -www.hatdaw.com <https://urldefense.com/v3/__http:/www.hatdaw.com/__;!!Fhnm7mQ!YevFlM_ZEfDefuiwzTJkzkf3AD_m2gz3bNuRV1vBloyNl5i_dk3lqxRT4g9XVBQQvAF9JlCoiH0A9Sxn42qDMt_OlQ$>
>
> On 7/30/2024 9:44 AM, Pearson, Ron wrote:
>
> Hello Stephen,
>
> Was it awesome, did they go over finite element (MOM)
> models and programming on how the array was built and
> modeled and the conceptual motivation for the design?
>
> Thank you 😊
>
> Ron
>
> *From:*SBE-89-alaska
> <sbe-89-alaska-bounces at sea.sbe16.org>
> <mailto:sbe-89-alaska-bounces at sea.sbe16.org> *On
> Behalf Of *Stephen Lockwood via SBE-89-alaska
> *Sent:* Wednesday, July 24, 2024 7:11 AM
> *To:* Pierre Lonewolf <lonewolf at otz.net>
> <mailto:lonewolf at otz.net>; SBE Chapter 89 Alaska
> <sbe-89-alaska at sea.sbe16.org>
> <mailto:sbe-89-alaska at sea.sbe16.org>
> *Subject:* [EXTERNAL] Re: [SBE-89-Alaska] HARRP
>
> Did you find a ride?
>
> Stephen Lockwood
>
> On Jul 21, 2024, at 19:41, Pierre Lonewolf via
> SBE-89-alaska <sbe-89-alaska at sea.sbe16.org>
> wrote:<https://www.google.com/maps/search/393B+Whittier+Street+%0D%0A+Kotzebue,+Alaska?entry=gmail&source=g>
>
> Is anyone from Anchorage driving to the HARRP tour? I finally looked at the map and why am I going to Fairbanks!?
>
>
>
> Pierre Lonewolf
>
> PO Box 983
>
> 393B Whittier Street <https://www.google.com/maps/search/393B+Whittier+Street+%0D%0A+Kotzebue,+Alaska?entry=gmail&source=g>
>
> Kotzebue, Alaska <https://www.google.com/maps/search/393B+Whittier+Street+%0D%0A+Kotzebue,+Alaska?entry=gmail&source=g> 99753-0983
>
>
>
> 19074120859 cell
>
> 19074423603 fax
>
> Lonewolf at otz.net
>
> Plonewolf55 at gmail.com
>
>
>
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